Fungus gnats are more of a nuisance than a real problem to most young plants and seedlings, but they can cause some issues if their population gets high enough. As you start your seedlings for this year’s garden, you will probably notice these tiny white flying insects that seem to infest some of the seedling trays. Sometimes they are everywhere, other times only on certain plants or sections of the seedling flats.
Fungus gnats are tiny mosquito-like insects (actually flies) that are small enough to be able to enter your home or greenhouse through the tiniest openings, but more often they ride in as eggs in soil that has been outside or in damp potting soil that has been exposed to the air for some time. If their population gets high enough, their larvae will cause damage to seedlings as they feed on the young, tender roots.
Fungus gnat life-cycle
The eggs are laid in tiny cracks in the soil surface, hatching within 6 days into larvae that feed on seedling roots, algae and fungi in the soil. After about 2 weeks of feeding, they pupate and a week later they emerge as adults, starting the cycle all over again. The emerging adults will be mostly females and they can lay between 100 – 300 eggs, so the population can increase rapidly. By the time you see the gnats flying around the seedlings, they’ve been active for at least a couple of weeks. The adults do not feed or bite, their only purpose is to reproduce in their 7 – 10 day lifespan.
There are a couple of approaches that we’ve found to be effective. Closely monitor the amount of water or moisture that is in the flats or cups where the seedlings are. Fungus gnats are highly attracted to moist and over-moist growing media, so they are almost always concentrated where there is a bit more moisture. Over-watering is one of the most common mistakes of all gardeners, new and experienced. This is understandable, as the seeds need a moist and warm environment to soften the seed coat and start the germination process, but afterwards they don’t need nearly as much water. This is where the over-watering condition sets in. It doesn’t take very much excess moisture at all to attract the gnats.
Treatment options
To detect and trap fungus gnat larvae, simply insert a small slice of potato just under the surface of the soil. The larvae will migrate to the potato and start feeding on it within a few days. After 3 – 5 days, remove the potato slice and look on the bottom side for clear to very pale white larvae feeding on the potato. This will tell you whether you’ve got the fungus gnats as larvae and how concentrated the population is. If you’ve got a large population of larvae, put a number of potato slices into the soil to attract more larvae, then remove, inspect and throw the slices away after about a week.
Yellow sticky traps are very effective means of monitoring and capturing the adult gnats. They will show up as black specks on the bright yellow background. This may be all you need to do, but if they persist there are a couple of biological friendly sprays that we’ve had success with. The first is from Safer products, is called “3-in-1″³ and is effective on insects, mites and fungi. We have found that one or two applications are effective. The other is Safer brand “Yard and Garden” spray with plant-derived pyrethrins that are highly effective on insects. Both products are OMRI listed as accepted for organic growers.
Overall, realize that fungus gnats are more of a nuisance than real problem, but serve as an effective notice that your seedling soil is a bit too moist. Decrease the soil moisture slightly, monitor and trap the larvae and adults and you’ll most likely not have any noticeable damage to your seedlings.
Damping-off is a soil borne disease that can attack almost all young vegetable seedlings. Home gardeners often first notice that something is wrong when the very young seedlings have a constriction around the base of the stem, some of the seedlings have fallen over or there are small flying gnats around the base of the seedlings. Damping off is caused by soil fungi and the right conditions to help them flourish.
If not taken care of, losses can be severe and results in the majority of a flat of carefully planted seedlings dying in 24 to 48 hours. Damping-off can happen before seedlings emerge from the soil. With this type of damping-off, fungi infect seeds as they germinate. As the infection progresses, seeds rot and do not germinate, leading many home gardeners to think that the seed quality is poor. Another result of seedling infected damping-off is poor or weaker seedlings that become apparent days or weeks later.
Even if some of the seedlings survive damping off and are transplanted, they are often stunted and have a twisted, constricted or off-color stem – called ‘wire-stem’ – and have health and production issues.
Not everyone experiences damping off, yet other gardeners in the same area fight with it yearly. Some gardeners buy seed starting mix every year, otherwise they suffer large seedling losses; while others (including ourselves) have mixed our own soil for years and have had very little problems. Just because your neighbor or gardening club friend has trouble with damping off, it doesn’t automatically mean you will also. We’ve created this article as a tool to help you troubleshoot and control how and why damping off happens.
Causes of Damping off
The most common cause of damping off is from soil borne fungi from three groups – Pythium, Rhizoctonia, and Fusarium.
Pythium thrives in cool, over-wet and poorly-drained soils and is often the result of over-watering and not maintaining a warm enough soil temperature for the seeds to germinate. Its symptoms are a damp, odorless rot in the root, causing it to be slimy. It may run up the lower portion of the stem and cause it to be black and slimy. Pythium can survive in soil for several years.
Rhizoctonia is present in all natural soils, coming to life when a soil is over-wet and hot. This is the most common occurrence of damping off, as the seedling will have the classic constriction on the stem right around where it touches the soil.
Fusarium thrives in acidic soils that are poorly fertilized and can remain inactive for long periods of time – years. Fusarium infects the seeds, causing many of them to fail to germinate and creating the ‘wire-stem’ appearance in those that do survive.
There are also seed-borne bacterial and fungal pathogens that can decimate seedlings. These are most often seen in seeds obtained from seed swaps or gardening clubs with poor sanitation and handling techniques in processing and packing seeds. If not recognized and corrected, seed borne pathogens will continue to infect future generations of seed that is saved and distributed.
Controlling Damping Off
Damping off may not be able to be prevented, but there are several easy and highly effective methods to control the outbreaks which will greatly lessen the severity of your seedling losses.
For seeds, the easiest method to control seed borne diseases is to source your seeds from a reputable, knowledgeable and experienced seed company or person. Don’t be afraid to ask questions and listen to the answers. An experienced company, grower or garden club member will be able to easily tell you what measures they take, for what varieties and why. If you are sourcing seeds from a local grower or garden club member, it will be very easy to ask around and determine their reputation.
For soil, the easiest and most proven method is simply starting with fresh, sterilized seed starting mix from established and trusted sources. There are a number of bagged seed starting mixes in gardening centers and big box stores, and often some reputable local sources. Simply buying a fresh bag, bringing it home and dumping it into your old faithful seeding tub is not the answer – you might have just infected the fresh soil! First you absolutely must thoroughly clean and sanitize all of your seed starting tools, otherwise you’ve only infected new material and brought the problem into a new season.
After cleaning and removing all of the soil residue, wash with warm soapy water, rinse well then soak in a weak bleach solution – 2 Tablespoons of bleach in a gallon of water and keep the surface wet for 5 minutes. Soaking hand tools such as trowels, hand hoes and such in a small bucket is the easiest, while spraying the potting bench and sink or mixing container works well. Spray as needed to keep the surfaces wet, then let air dry. After sanitizing, you are ready to open the bag of fresh seed starting mix and let the magic of another season of gardening begin!
A good seed starting mix will not only be sterile, but drain well and ideally have a little nutrition for the young seedlings so they won’t need transplanting right after they sprout. You can mix your own or buy a bagged mix from your local garden center or big box store. If you are interested in mixing your own, Seed Starting Media for the Home Gardenerwill show you what the different ingredients are and what they do.
Practical Tips
There are a couple of tools a home gardener has in their day to day gardening to minimize the chance of damaging fungi getting a toehold in the seed beds.
The easiest, most overlooked and most important is to avoid over-watering. If you notice, two of the three damping off fungi thrive in damp, over-wet conditions. This one mistake is responsible for most of the gardening woes today, both in the seed starting trays and the garden itself. It is best to bottom water seedlings using a standard seed starting tray and wicking seed starting pots. Paper pots have excellent wicking capacity, are easy to make and give the gardener control of how long the pot will last by how many wraps of paper are used to make the pot. Let the water sit for no longer than 20 – 30 minutes, then drain to avoid an over-wet situation. Water 2 or 3 times a day if needed to keep the soil moist during sprouting.
Over-seeding or overcrowding of seedlings creates a favorable environment for destructive fungi to flourish, so give the seedlings room to grow. If needed, thin the weakest seedlings in a starting pot or seedling tray with snips, not by pulling them out. Pulling the seedlings out disturbs and damages adjacent roots and causes more problems down the road. Planting fewer seeds in a pot or seed tray cell will lessen the amount of thinning greatly.
Air movement can significantly reduce the activity of the fungi, as a fan moving air helps to slightly dry the surface of the soil/seedling interface, making it harder for the fungi to get established. This works best in combination with carefully monitoring the soil moisture.
Daily observation is another easy to do, yet often overlooked tool. Catching the fungi in action early gives you a better chance to take corrective action and save more seedlings from an early death. Get in the habit of spending a few minutes just looking at the seedling trays, looking at all of the minute details and getting very familiar with what “normal” looks like. Then compare that each successive day to see if something looks out of place or not right.
Treatment of Damping Off
Now that you’ve got the knowledge and tools to minimize the chance of damping off happening, let’s look at some treatment options if and when it does show its ugly head.
Chamomile is one of the oldest treatments and is one of the gentlest to try first. It is high in sulfur and is a mild fungicide. Make a strong tea with 3 tea bags steeped for at least 20 minutes, then mist on the seedlings once cool.
Cinnamon is a potent natural fungicide that should only be used once. Lightly sprinkle infected soil with finely ground fresh cinnamon if the chamomile doesn’t work in the first day.
Canadian gardening guru Doug Green has found that homemade garlic spray is also very effective against damping off, as garlic is a potent anti-fungal. To make, crush or blend several garlic cloves into a quart of water, then simmer over low heat until the garlic is softened and the essential oils are released. Cool and strain, then spray on the seedlings, making sure to get the stems. If using as a soil drench, straining isn’t as needed.
Now that you’ve got the knowledge to be pro-active in controlling damping off, as well as some tips and tools to treat it when it shows up, you should have a great start to a prolific garden this year!
https://w9j002.p3cdn1.secureserver.net/wp-content/uploads/2015/02/Damping-off1.jpg?time=1730497972300500Stephen Scotthttps://w9j002.p3cdn1.secureserver.net/wp-content/uploads/2019/06/Survey-Header.jpgStephen Scott2015-02-13 17:40:012024-04-30 17:34:00Damping off – Causes and Control
Cucamelons can act as a perennial if you are lucky enough to live in a climate where they can produce tubers, or radish-like roots. The first year they will produce as normal by starting to fruit around July until the first frost stops them. As they start to slow down, search around in the soil by gently exposing some of their roots to see if they have produced tubers. They will be a white to off white color and look something like radishes. If you see them, you can store them in a protected area over the winter and replant them next spring for extra early and larger harvests of cucamelons!
To store them, gently lift them out of the soil and stored in very slightly moist compost or potting soil in a cool but frost-free area. Next spring, wake them up by transplanting into pots early to mid-April in moist compost or potting soil and place them in a well-lit, sunny room. Plant in the garden into warm soil after the last frost date. These second year plants will take off sooner, producing flowers and fruit much earlier, giving you a longer season and greatly increased harvest.
If you live in an area that doesn’t get much frost, then you can overwinter the roots in place by insulating with 6 – 8 inches of straw mulch and lightly moistening it. They will be able to survive temperatures down to freezing with this approach. To ensure that the roots are less likely to rot in the cool moist soil, make sure that there is plenty of sand in the soil to allow the excess moisture to drain away.
If desired, the roots can be gently uncovered and transplanted much like above after overwintering in place to increase your yearly harvest.
When lettuce is mentioned, many think of the standard iceberg lettuce found in supermarkets and restaurant salads. That is changing with the growth in popularity of the different types of lettuces from Romaine to head and leaf-type lettuces, mainly due to the flavors and colors that they offer from deep red to almost white and noticeably sweet to tangy and slightly bitter. Iceberg lettuce, originally bred as a hybrid, is now offered as an open pollinated variety and has been around long enough to be considered by some as an “heirloom”!
We have come to expect lettuce year-round, mainly due to being educated by the supermarkets as to what our vegetables should look like, taste like and when they should be available. Many are surprised to find that lettuce is a cool season crop and will bolt or go to seed readily during late spring and summer months. It is best planted early in spring and then again in late summer or early fall when the temperatures start to cool off.
Saint Anne’s Slow Bolting Lettuce
Ideal Conditions for Lettuce Seed Germination
Lettuce seeds won’t sprout when soil temperatures are above 80°F but they will start to germinate as low as 40°F, making it ideal for early and late season planting. A plant hormone is produced under warm conditions that stop the germination process, called “thermo-inhibition”. This is a carryover from wild lettuce that originated in the Mediterranean Middle East, where summers are hot with little moisture. If the lettuce seeds were to sprout under these conditions, they would soon die out and the species would go extinct.
Thanks to traditional plant breeding and selection of heat tolerant characteristics over a number of years, there are several varieties of lettuce that are more heat tolerant and are open-pollinated – meaning you can save seeds from year to year. Some examples are Saint Anne’s Slow Bolting, Summertime, Black Seeded Simpson and Jericho. Just because these are heat tolerant doesn’t mean that they will grow through the summer, only that they won’t bolt or turn bitter quite as quickly.
Thanks to ongoing research on lettuce traits, there are some techniques to extend the sprouting for lettuce seeds into the warmer months that home gardeners can use. The optimum soil temperature for most lettuce seeds is 68°F, with some varieties sprouting in the 40 – 75°F range. The temperature of the soil must be taken, not just the air temperature which can be several degrees different.
Jericho Lettuce
Sprouting Lettuce Seed in Warm Weather
In warmer temperatures, imbibing or soaking the seeds in water for at least 16 hours before planting in a well-lit area will increase the germination percentages greatly. Red light has been found to be the best color, but many home gardeners won’t have access to a non-heating red light and sunlight or full-spectrum light was found to be almost as good. Soaking the seeds in the dark in warmer conditions decreased their germination rates. Another technique that has shown to be successful is to soak the seeds in cool water in a well-lit area for 16 – 24 hours. This approach has increased the germination rate up to 97% when planted in warmer conditions. Soaking for less than 16 hours has little to no positive effect on germination. For a closer look at what happens when a seed goes through germination, read our article “Starting Seeds at Home – a Deeper Look”.
Other successful methods of extending the season for lettuce in the garden include laying a thick mulch of straw or wood chips on the ground of at least 1 1/2 to 2 inches. This insulates the soil from becoming too hot and drying out too fast and helps to preserve moisture in the soil. Shading the lettuce plants can give enough of a temperature drop to keep them from bolting, sometimes up to 3 – 5 weeks. Shade can be from a shade cloth on a row cover or hoop type structure or companion planting of tall wide leafed plants such as some types of pumpkin.
The traditional rule of thumb of “plant early and plant often” for lettuce can also be said as “plant late and plant often”, but some of the more heat tolerant varieties, along with soaking in the light and providing some mulch and shade can greatly extend your lettuce season in the garden this year.
Want to learn more about what makes Terroir Seeds different? We are excited to be featured in the January 2015 issue of Acres USA magazine, the voice of eco-agriculture for over 40 years. This will give you great insight into what makes Terroir Seeds so unique in today’s seed world.
https://w9j002.p3cdn1.secureserver.net/wp-content/uploads/2015/01/Acres-Article1-1.jpg?time=1730497972339850Stephen Scotthttps://w9j002.p3cdn1.secureserver.net/wp-content/uploads/2019/06/Survey-Header.jpgStephen Scott2015-01-07 19:27:372024-06-23 13:03:57Acres USA Feature: Soil to Seed
Food is something that many of us in the US, quite literally, take for granted. We have reached the point where we simply don’t think about it much anymore. This has become both a blessing and a curse.
For most of us, food is always available, never in short supply and the choices can be staggering. Do we want Asian, Italian, Mexican or American tonight? Easy enough. For some, we can drill down much deeper to regional cuisines of the world available for the price of a phone call or a short drive. The selection at the supermarket or grocery store has exploded, with even the most mundane supermarket in small towns offering aisles of international food that have never been seen before in history.
Of course, any discussion of food is by definition a complex one, and the acknowledgment must be made of the less fortunate that live in “food deserts” where the only available food within 30 minutes is at a convenience store; and those that are euphemistically classified as “food insecure” – meaning hungry. Yes, here in America where we are constantly being told that we must “feed the world” with industrial agriculture, we have a dirty little open secret – 1 in 7 or 49 million of our own people don’t have enough to eat, or don’t know where their next meal will come from.
Today we will look at a slightly different picture, that of food as it relates to civilization and how it can affect all of our lives in positive or negative ways. Food can support or topple governments, as vividly demonstrated by the fairly recent events of the “Arab Spring” uprising in the Middle East where food prices and availability brought down established governments in a matter of weeks.
Henry Kissinger’s famous quip from the 1970s rings as chillingly true today as it did then, “If you control the oil you control the country; if you control food, you control the population.”
In light of that, let’s look at some excerpts from Dr. Vandana Shiva’s lecture we attended at Arizona State University’s Global School of Sustainability on October 30, 2014. Her lecture was titled “Future of Food: Dictatorship or Democracy?” For those not familiar with Dr. Shiva, she is a physicist, environmental activist, speaker and author. Her newest book is Making Peace with the Earth.
Food is the web of life, with interactions between different organisms. The soil food web is such an amazing contradiction to that extremely false idea that life is a pyramid with man on top. The organisms in the soil are one step beyond us, we are their food. That should bring us a bit of humility!
How true this is! In our everyday lives, we often forget that we continue to be here thanks to about 6 inches of soil that feeds us multiple times a day, every week, all year long throughout our lifetimes. 2015 is designated as the International Year of Soils by the UN General Assembly, in recognition of the overlooked importance soil plays in all of our lives.
How we produce and consume food is probably the most significant impact both on the planet and society.
Food is more important in our daily lives than we probably realize on a regular basis. Not only does it feed and nourish us, it brings us together socially at mealtimes, holidays and festivities as well as having a major impact in our political system and our national policies, both at home and abroad. The Farm Bill and international trade agreements are just two examples of this importance.
When Dr. Shiva was doing research in the Punjab region of India for her 1992 book “The Violence of the Green Revolution”, she realized that
When you can’t choose what you grow, when you can’t decide the methods of production, when you don’t determine the price of what you produce, when your own rivers’ water can’t be released through your decision, then you are living under slavery.
When she said this, it immediately brought to mind the situations of some of our farmers, especially the contracted chicken and pig producers, as well as commodity crop growers who are locked into multi-year contracts that specify everything – the seed, chicks or piglets to be used, what feed or fertilizers, pesticides or herbicides will be applied, the length of time until harvest and what price will be paid by the buyer after harvest. There are often punitive clauses that penalize the grower or farmer if conditions or quotas aren’t met. Some large operations, corporations themselves, do well in these contracts, but family farmers do not often find them beneficial in the long run.
A dictatorship is control of an absolute kind. Look at what is happening to our food system – seed, the first link in the food system is being controlled like we’ve never seen before. It was not controlled before, it was shared. We had public universities breeding seed, and they would share the seed. Farmers would share seed with each other.
The issue of food dictatorship begins with the seed, goes into food, goes into our knowledge, goes into how our decisions are made, because governments become involved with the laws they make.
This is a very important point that is not addressed much in today’s food system discussions; the very beginning of the entire food chain comes down to a seed. We have seen the incredible consolidation of almost an entire industry in a little more than a decade. From dozens of companies, we now have 6 that control 80% of the commercial seed supply worldwide.
In decades past, land grant universities bred new open pollinated varieties and shared them with growers in their state. Those growers further selected for the best traits and passed them along, partly sharing and selling. The USDA had a large breeding and research section that would send seed home with Senators and Congressmen when they went back home on the train. Farmers and growers could subscribe to the USDA’s publication, read about new varieties they were interested in and write for samples of seed to try. Bear in mind, these weren’t “Free” seeds; they were paid for by taxes and funded through the agricultural programs of the USDA. The growers and farmers didn’t pay out of pocket for them, but paid via their taxes.
Now, there are very few public universities doing seed research and breeding that are releasing them to the public. The notable exception was in April of 2014 when the University of Wisconsin, Madison ‘Open Source Seed Initiative’ project released 29 new varieties of seed for 14 different crops. Because this type of program was so unknown, many articles and Facebook posts erroneously trumpeted the “Free Seed Initiative”, creating confusion as to what this breeding program was trying to do. The aim of this project is to get new open pollinated seed varieties into growers hands so that they can become available for the public.
This is what seed democracy and by extension, food democracy, looks like. This is what is happening with every small, independent heirloom seed company that works to bring overlooked heirloom seed varieties to market. It is also what is happening with the explosion of Farmer’s Markets across the US, as well as the sustained double-digit growth in the resurgence of the home based backyard garden. Local food hubs and food production systems are being re-thought, re-engineered and re-designed like never before. Farmers and growers who used to see themselves as ‘competitors’ are now beginning to view each other as ‘collaborators’ or ‘co-creators’ in new ventures, with an improved local food system as the result.
Seed sovereignty is the very basis of food sovereignty, of food democracy. Every UN study shows that small scale agroecology produces more food than industrial chemical agriculture. The United Nations Environmental Program 2012 study “Avoiding Future Famines” defends the ecological foundations of traditional, sustainable agriculture.
Something like 70% of the food we eat worldwide is still grown today by small farmers. This has been true for centuries in places like Russia with its ‘Dacha gardening’ system growing close to 50% of the fresh food by the people, for the people. Food democracy can exist, even under the strictest non-democratic governments!
The biotech companies produce seed that is very costly; it is only the governmental subsidies that produce food that is cheap. There is $400 billion in agricultural subsidies – a billion dollars a day!
If that tax money was diverted from subsidizing toxic food that’s destroying the planet and destroying our health and shifted to growing food that protects our health, protects the planet and generates employment in the process, then we could begin to reverse the agricultural damage to the world.
75% of planetary damage to soil, water and biodiversity and 40% of the greenhouse gases comes from global industrial agriculture. This is the single biggest impact on the planet, and yet ecological farming and local food systems can be the place, maybe, to do the opposite. We can rejuvenate biodiversity, we can save seed, we build up organic fertility of the soil, and we conserve water.
This is big-picture thinking, but on many scales it makes sense in many ways. Voluntary, participatory and evolutionary seed breeding projects that are not corporately involved can be very strong food security and food democracy measures today. In times of changing climactic conditions, the plants must be allowed and encouraged to adapt to the current agricultural conditions. Farmers have done this for centuries, evolving salt tolerant or arid varieties that continue to produce food during changing times.
A perfect example of this was after the 2004 Tsunami in Thailand and Indonesia. Dr. Shiva’s foundation, Navdanya, a participatory agricultural research program – gifted 2 truckloads of salt tolerant seeds to the farmers, who had been told that no agriculture was possible for 5 years by their government agricultural resources. The seeds didn’t just survive; they did extremely well and have been saved and shared all across the region. Seeds are hope, the hope for our future. They are the real diversity, the real insurance for the future, whether it is climate change, to create democracy or deal with pest and diseases.
What is your role in creating a food democracy instead of a food dictatorship? Do what you can – grow a garden or expand it, help others garden, grow a row for the hungry and donate it to your local food pantry, buy at the Farmer’s Market, buy a CSA share from a local grower, and choose the closest grown produce at the supermarket. Each of us individually may not be able to influence farm policy, but we can make a change in our daily food, and that is where real, lasting change starts.
https://w9j002.p3cdn1.secureserver.net/wp-content/uploads/2015/01/Vandana-Shiva-ASU.jpg?time=1730497972281500Stephen Scotthttps://w9j002.p3cdn1.secureserver.net/wp-content/uploads/2019/06/Survey-Header.jpgStephen Scott2015-01-02 17:46:462024-04-30 17:34:01Future of Food: Dictatorship or Democracy?
Controlling Fungus Gnats in Seedlings
Fungus gnats are more of a nuisance than a real problem to most young plants and seedlings, but they can cause some issues if their population gets high enough. As you start your seedlings for this year’s garden, you will probably notice these tiny white flying insects that seem to infest some of the seedling trays. Sometimes they are everywhere, other times only on certain plants or sections of the seedling flats.
Fungus gnats are tiny mosquito-like insects (actually flies) that are small enough to be able to enter your home or greenhouse through the tiniest openings, but more often they ride in as eggs in soil that has been outside or in damp potting soil that has been exposed to the air for some time. If their population gets high enough, their larvae will cause damage to seedlings as they feed on the young, tender roots.
Fungus gnat life-cycle
There are a couple of approaches that we’ve found to be effective. Closely monitor the amount of water or moisture that is in the flats or cups where the seedlings are. Fungus gnats are highly attracted to moist and over-moist growing media, so they are almost always concentrated where there is a bit more moisture. Over-watering is one of the most common mistakes of all gardeners, new and experienced. This is understandable, as the seeds need a moist and warm environment to soften the seed coat and start the germination process, but afterwards they don’t need nearly as much water. This is where the over-watering condition sets in. It doesn’t take very much excess moisture at all to attract the gnats.
Treatment options
To detect and trap fungus gnat larvae, simply insert a small slice of potato just under the surface of the soil. The larvae will migrate to the potato and start feeding on it within a few days. After 3 – 5 days, remove the potato slice and look on the bottom side for clear to very pale white larvae feeding on the potato. This will tell you whether you’ve got the fungus gnats as larvae and how concentrated the population is. If you’ve got a large population of larvae, put a number of potato slices into the soil to attract more larvae, then remove, inspect and throw the slices away after about a week.
Yellow sticky traps are very effective means of monitoring and capturing the adult gnats. They will show up as black specks on the bright yellow background. This may be all you need to do, but if they persist there are a couple of biological friendly sprays that we’ve had success with. The first is from Safer products, is called “3-in-1″³ and is effective on insects, mites and fungi. We have found that one or two applications are effective. The other is Safer brand “Yard and Garden” spray with plant-derived pyrethrins that are highly effective on insects. Both products are OMRI listed as accepted for organic growers.
Overall, realize that fungus gnats are more of a nuisance than real problem, but serve as an effective notice that your seedling soil is a bit too moist. Decrease the soil moisture slightly, monitor and trap the larvae and adults and you’ll most likely not have any noticeable damage to your seedlings.
Damping off – Causes and Control
Damping-off is a soil borne disease that can attack almost all young vegetable seedlings. Home gardeners often first notice that something is wrong when the very young seedlings have a constriction around the base of the stem, some of the seedlings have fallen over or there are small flying gnats around the base of the seedlings. Damping off is caused by soil fungi and the right conditions to help them flourish.
If not taken care of, losses can be severe and results in the majority of a flat of carefully planted seedlings dying in 24 to 48 hours. Damping-off can happen before seedlings emerge from the soil. With this type of damping-off, fungi infect seeds as they germinate. As the infection progresses, seeds rot and do not germinate, leading many home gardeners to think that the seed quality is poor. Another result of seedling infected damping-off is poor or weaker seedlings that become apparent days or weeks later.
Even if some of the seedlings survive damping off and are transplanted, they are often stunted and have a twisted, constricted or off-color stem – called ‘wire-stem’ – and have health and production issues.
Not everyone experiences damping off, yet other gardeners in the same area fight with it yearly. Some gardeners buy seed starting mix every year, otherwise they suffer large seedling losses; while others (including ourselves) have mixed our own soil for years and have had very little problems. Just because your neighbor or gardening club friend has trouble with damping off, it doesn’t automatically mean you will also. We’ve created this article as a tool to help you troubleshoot and control how and why damping off happens.
Causes of Damping off
The most common cause of damping off is from soil borne fungi from three groups – Pythium, Rhizoctonia, and Fusarium.
Pythium thrives in cool, over-wet and poorly-drained soils and is often the result of over-watering and not maintaining a warm enough soil temperature for the seeds to germinate. Its symptoms are a damp, odorless rot in the root, causing it to be slimy. It may run up the lower portion of the stem and cause it to be black and slimy. Pythium can survive in soil for several years.
Rhizoctonia is present in all natural soils, coming to life when a soil is over-wet and hot. This is the most common occurrence of damping off, as the seedling will have the classic constriction on the stem right around where it touches the soil.
Fusarium thrives in acidic soils that are poorly fertilized and can remain inactive for long periods of time – years. Fusarium infects the seeds, causing many of them to fail to germinate and creating the ‘wire-stem’ appearance in those that do survive.
There are also seed-borne bacterial and fungal pathogens that can decimate seedlings. These are most often seen in seeds obtained from seed swaps or gardening clubs with poor sanitation and handling techniques in processing and packing seeds. If not recognized and corrected, seed borne pathogens will continue to infect future generations of seed that is saved and distributed.
Controlling Damping Off
Damping off may not be able to be prevented, but there are several easy and highly effective methods to control the outbreaks which will greatly lessen the severity of your seedling losses.
For seeds, the easiest method to control seed borne diseases is to source your seeds from a reputable, knowledgeable and experienced seed company or person. Don’t be afraid to ask questions and listen to the answers. An experienced company, grower or garden club member will be able to easily tell you what measures they take, for what varieties and why. If you are sourcing seeds from a local grower or garden club member, it will be very easy to ask around and determine their reputation.
For soil, the easiest and most proven method is simply starting with fresh, sterilized seed starting mix from established and trusted sources. There are a number of bagged seed starting mixes in gardening centers and big box stores, and often some reputable local sources. Simply buying a fresh bag, bringing it home and dumping it into your old faithful seeding tub is not the answer – you might have just infected the fresh soil! First you absolutely must thoroughly clean and sanitize all of your seed starting tools, otherwise you’ve only infected new material and brought the problem into a new season.
After cleaning and removing all of the soil residue, wash with warm soapy water, rinse well then soak in a weak bleach solution – 2 Tablespoons of bleach in a gallon of water and keep the surface wet for 5 minutes. Soaking hand tools such as trowels, hand hoes and such in a small bucket is the easiest, while spraying the potting bench and sink or mixing container works well. Spray as needed to keep the surfaces wet, then let air dry. After sanitizing, you are ready to open the bag of fresh seed starting mix and let the magic of another season of gardening begin!
A good seed starting mix will not only be sterile, but drain well and ideally have a little nutrition for the young seedlings so they won’t need transplanting right after they sprout. You can mix your own or buy a bagged mix from your local garden center or big box store. If you are interested in mixing your own, Seed Starting Media for the Home Gardener will show you what the different ingredients are and what they do.
Practical Tips
There are a couple of tools a home gardener has in their day to day gardening to minimize the chance of damaging fungi getting a toehold in the seed beds.
The easiest, most overlooked and most important is to avoid over-watering. If you notice, two of the three damping off fungi thrive in damp, over-wet conditions. This one mistake is responsible for most of the gardening woes today, both in the seed starting trays and the garden itself. It is best to bottom water seedlings using a standard seed starting tray and wicking seed starting pots. Paper pots have excellent wicking capacity, are easy to make and give the gardener control of how long the pot will last by how many wraps of paper are used to make the pot. Let the water sit for no longer than 20 – 30 minutes, then drain to avoid an over-wet situation. Water 2 or 3 times a day if needed to keep the soil moist during sprouting.
Over-seeding or overcrowding of seedlings creates a favorable environment for destructive fungi to flourish, so give the seedlings room to grow. If needed, thin the weakest seedlings in a starting pot or seedling tray with snips, not by pulling them out. Pulling the seedlings out disturbs and damages adjacent roots and causes more problems down the road. Planting fewer seeds in a pot or seed tray cell will lessen the amount of thinning greatly.
Air movement can significantly reduce the activity of the fungi, as a fan moving air helps to slightly dry the surface of the soil/seedling interface, making it harder for the fungi to get established. This works best in combination with carefully monitoring the soil moisture.
Daily observation is another easy to do, yet often overlooked tool. Catching the fungi in action early gives you a better chance to take corrective action and save more seedlings from an early death. Get in the habit of spending a few minutes just looking at the seedling trays, looking at all of the minute details and getting very familiar with what “normal” looks like. Then compare that each successive day to see if something looks out of place or not right.
Treatment of Damping Off
Now that you’ve got the knowledge and tools to minimize the chance of damping off happening, let’s look at some treatment options if and when it does show its ugly head.
Chamomile is one of the oldest treatments and is one of the gentlest to try first. It is high in sulfur and is a mild fungicide. Make a strong tea with 3 tea bags steeped for at least 20 minutes, then mist on the seedlings once cool.
Cinnamon is a potent natural fungicide that should only be used once. Lightly sprinkle infected soil with finely ground fresh cinnamon if the chamomile doesn’t work in the first day.
Canadian gardening guru Doug Green has found that homemade garlic spray is also very effective against damping off, as garlic is a potent anti-fungal. To make, crush or blend several garlic cloves into a quart of water, then simmer over low heat until the garlic is softened and the essential oils are released. Cool and strain, then spray on the seedlings, making sure to get the stems. If using as a soil drench, straining isn’t as needed.
Now that you’ve got the knowledge to be pro-active in controlling damping off, as well as some tips and tools to treat it when it shows up, you should have a great start to a prolific garden this year!
Overwintering Cucamelons
Cucamelons can act as a perennial if you are lucky enough to live in a climate where they can produce tubers, or radish-like roots. The first year they will produce as normal by starting to fruit around July until the first frost stops them. As they start to slow down, search around in the soil by gently exposing some of their roots to see if they have produced tubers. They will be a white to off white color and look something like radishes. If you see them, you can store them in a protected area over the winter and replant them next spring for extra early and larger harvests of cucamelons!
To store them, gently lift them out of the soil and stored in very slightly moist compost or potting soil in a cool but frost-free area. Next spring, wake them up by transplanting into pots early to mid-April in moist compost or potting soil and place them in a well-lit, sunny room. Plant in the garden into warm soil after the last frost date. These second year plants will take off sooner, producing flowers and fruit much earlier, giving you a longer season and greatly increased harvest.
If you live in an area that doesn’t get much frost, then you can overwinter the roots in place by insulating with 6 – 8 inches of straw mulch and lightly moistening it. They will be able to survive temperatures down to freezing with this approach. To ensure that the roots are less likely to rot in the cool moist soil, make sure that there is plenty of sand in the soil to allow the excess moisture to drain away.
If desired, the roots can be gently uncovered and transplanted much like above after overwintering in place to increase your yearly harvest.
Improve Lettuce Seed Germination
Grow Lettuce Longer Into the Warm Season
When lettuce is mentioned, many think of the standard iceberg lettuce found in supermarkets and restaurant salads. That is changing with the growth in popularity of the different types of lettuces from Romaine to head and leaf-type lettuces, mainly due to the flavors and colors that they offer from deep red to almost white and noticeably sweet to tangy and slightly bitter. Iceberg lettuce, originally bred as a hybrid, is now offered as an open pollinated variety and has been around long enough to be considered by some as an “heirloom”!
We have come to expect lettuce year-round, mainly due to being educated by the supermarkets as to what our vegetables should look like, taste like and when they should be available. Many are surprised to find that lettuce is a cool season crop and will bolt or go to seed readily during late spring and summer months. It is best planted early in spring and then again in late summer or early fall when the temperatures start to cool off.
Saint Anne’s Slow Bolting Lettuce
Ideal Conditions for Lettuce Seed Germination
Lettuce seeds won’t sprout when soil temperatures are above 80°F but they will start to germinate as low as 40°F, making it ideal for early and late season planting. A plant hormone is produced under warm conditions that stop the germination process, called “thermo-inhibition”. This is a carryover from wild lettuce that originated in the Mediterranean Middle East, where summers are hot with little moisture. If the lettuce seeds were to sprout under these conditions, they would soon die out and the species would go extinct.
Thanks to traditional plant breeding and selection of heat tolerant characteristics over a number of years, there are several varieties of lettuce that are more heat tolerant and are open-pollinated – meaning you can save seeds from year to year. Some examples are Saint Anne’s Slow Bolting, Summertime, Black Seeded Simpson and Jericho. Just because these are heat tolerant doesn’t mean that they will grow through the summer, only that they won’t bolt or turn bitter quite as quickly.
Thanks to ongoing research on lettuce traits, there are some techniques to extend the sprouting for lettuce seeds into the warmer months that home gardeners can use. The optimum soil temperature for most lettuce seeds is 68°F, with some varieties sprouting in the 40 – 75°F range. The temperature of the soil must be taken, not just the air temperature which can be several degrees different.
Jericho Lettuce
Sprouting Lettuce Seed in Warm Weather
In warmer temperatures, imbibing or soaking the seeds in water for at least 16 hours before planting in a well-lit area will increase the germination percentages greatly. Red light has been found to be the best color, but many home gardeners won’t have access to a non-heating red light and sunlight or full-spectrum light was found to be almost as good. Soaking the seeds in the dark in warmer conditions decreased their germination rates. Another technique that has shown to be successful is to soak the seeds in cool water in a well-lit area for 16 – 24 hours. This approach has increased the germination rate up to 97% when planted in warmer conditions. Soaking for less than 16 hours has little to no positive effect on germination. For a closer look at what happens when a seed goes through germination, read our article “Starting Seeds at Home – a Deeper Look”.
Other successful methods of extending the season for lettuce in the garden include laying a thick mulch of straw or wood chips on the ground of at least 1 1/2 to 2 inches. This insulates the soil from becoming too hot and drying out too fast and helps to preserve moisture in the soil. Shading the lettuce plants can give enough of a temperature drop to keep them from bolting, sometimes up to 3 – 5 weeks. Shade can be from a shade cloth on a row cover or hoop type structure or companion planting of tall wide leafed plants such as some types of pumpkin.
The traditional rule of thumb of “plant early and plant often” for lettuce can also be said as “plant late and plant often”, but some of the more heat tolerant varieties, along with soaking in the light and providing some mulch and shade can greatly extend your lettuce season in the garden this year.
Acres USA Feature: Soil to Seed
Family Company Fosters Seed Freedom
Want to learn more about what makes Terroir Seeds different? We are excited to be featured in the January 2015 issue of Acres USA magazine, the voice of eco-agriculture for over 40 years. This will give you great insight into what makes Terroir Seeds so unique in today’s seed world.
These varieties are featured in the article – Zapotec Tomato, Chile de Agua, Kentucky Wonder Pole Bean, and Rosemary.
Click the photo to read the article!
Acres USA Soil to Seed Article
Future of Food: Dictatorship or Democracy?
Food is something that many of us in the US, quite literally, take for granted. We have reached the point where we simply don’t think about it much anymore. This has become both a blessing and a curse.
For most of us, food is always available, never in short supply and the choices can be staggering. Do we want Asian, Italian, Mexican or American tonight? Easy enough. For some, we can drill down much deeper to regional cuisines of the world available for the price of a phone call or a short drive. The selection at the supermarket or grocery store has exploded, with even the most mundane supermarket in small towns offering aisles of international food that have never been seen before in history.
Of course, any discussion of food is by definition a complex one, and the acknowledgment must be made of the less fortunate that live in “food deserts” where the only available food within 30 minutes is at a convenience store; and those that are euphemistically classified as “food insecure” – meaning hungry. Yes, here in America where we are constantly being told that we must “feed the world” with industrial agriculture, we have a dirty little open secret – 1 in 7 or 49 million of our own people don’t have enough to eat, or don’t know where their next meal will come from.
Today we will look at a slightly different picture, that of food as it relates to civilization and how it can affect all of our lives in positive or negative ways. Food can support or topple governments, as vividly demonstrated by the fairly recent events of the “Arab Spring” uprising in the Middle East where food prices and availability brought down established governments in a matter of weeks.
Henry Kissinger’s famous quip from the 1970s rings as chillingly true today as it did then, “If you control the oil you control the country; if you control food, you control the population.”
In light of that, let’s look at some excerpts from Dr. Vandana Shiva’s lecture we attended at Arizona State University’s Global School of Sustainability on October 30, 2014. Her lecture was titled “Future of Food: Dictatorship or Democracy?” For those not familiar with Dr. Shiva, she is a physicist, environmental activist, speaker and author. Her newest book is Making Peace with the Earth.
How true this is! In our everyday lives, we often forget that we continue to be here thanks to about 6 inches of soil that feeds us multiple times a day, every week, all year long throughout our lifetimes. 2015 is designated as the International Year of Soils by the UN General Assembly, in recognition of the overlooked importance soil plays in all of our lives.
Food is more important in our daily lives than we probably realize on a regular basis. Not only does it feed and nourish us, it brings us together socially at mealtimes, holidays and festivities as well as having a major impact in our political system and our national policies, both at home and abroad. The Farm Bill and international trade agreements are just two examples of this importance.
When Dr. Shiva was doing research in the Punjab region of India for her 1992 book “The Violence of the Green Revolution”, she realized that
When she said this, it immediately brought to mind the situations of some of our farmers, especially the contracted chicken and pig producers, as well as commodity crop growers who are locked into multi-year contracts that specify everything – the seed, chicks or piglets to be used, what feed or fertilizers, pesticides or herbicides will be applied, the length of time until harvest and what price will be paid by the buyer after harvest. There are often punitive clauses that penalize the grower or farmer if conditions or quotas aren’t met. Some large operations, corporations themselves, do well in these contracts, but family farmers do not often find them beneficial in the long run.
This is a very important point that is not addressed much in today’s food system discussions; the very beginning of the entire food chain comes down to a seed. We have seen the incredible consolidation of almost an entire industry in a little more than a decade. From dozens of companies, we now have 6 that control 80% of the commercial seed supply worldwide.
In decades past, land grant universities bred new open pollinated varieties and shared them with growers in their state. Those growers further selected for the best traits and passed them along, partly sharing and selling. The USDA had a large breeding and research section that would send seed home with Senators and Congressmen when they went back home on the train. Farmers and growers could subscribe to the USDA’s publication, read about new varieties they were interested in and write for samples of seed to try. Bear in mind, these weren’t “Free” seeds; they were paid for by taxes and funded through the agricultural programs of the USDA. The growers and farmers didn’t pay out of pocket for them, but paid via their taxes.
Now, there are very few public universities doing seed research and breeding that are releasing them to the public. The notable exception was in April of 2014 when the University of Wisconsin, Madison ‘Open Source Seed Initiative’ project released 29 new varieties of seed for 14 different crops. Because this type of program was so unknown, many articles and Facebook posts erroneously trumpeted the “Free Seed Initiative”, creating confusion as to what this breeding program was trying to do. The aim of this project is to get new open pollinated seed varieties into growers hands so that they can become available for the public.
This is what seed democracy and by extension, food democracy, looks like. This is what is happening with every small, independent heirloom seed company that works to bring overlooked heirloom seed varieties to market. It is also what is happening with the explosion of Farmer’s Markets across the US, as well as the sustained double-digit growth in the resurgence of the home based backyard garden. Local food hubs and food production systems are being re-thought, re-engineered and re-designed like never before. Farmers and growers who used to see themselves as ‘competitors’ are now beginning to view each other as ‘collaborators’ or ‘co-creators’ in new ventures, with an improved local food system as the result.
Something like 70% of the food we eat worldwide is still grown today by small farmers. This has been true for centuries in places like Russia with its ‘Dacha gardening’ system growing close to 50% of the fresh food by the people, for the people. Food democracy can exist, even under the strictest non-democratic governments!
This is big-picture thinking, but on many scales it makes sense in many ways. Voluntary, participatory and evolutionary seed breeding projects that are not corporately involved can be very strong food security and food democracy measures today. In times of changing climactic conditions, the plants must be allowed and encouraged to adapt to the current agricultural conditions. Farmers have done this for centuries, evolving salt tolerant or arid varieties that continue to produce food during changing times.
A perfect example of this was after the 2004 Tsunami in Thailand and Indonesia. Dr. Shiva’s foundation, Navdanya, a participatory agricultural research program – gifted 2 truckloads of salt tolerant seeds to the farmers, who had been told that no agriculture was possible for 5 years by their government agricultural resources. The seeds didn’t just survive; they did extremely well and have been saved and shared all across the region. Seeds are hope, the hope for our future. They are the real diversity, the real insurance for the future, whether it is climate change, to create democracy or deal with pest and diseases.
What is your role in creating a food democracy instead of a food dictatorship? Do what you can – grow a garden or expand it, help others garden, grow a row for the hungry and donate it to your local food pantry, buy at the Farmer’s Market, buy a CSA share from a local grower, and choose the closest grown produce at the supermarket. Each of us individually may not be able to influence farm policy, but we can make a change in our daily food, and that is where real, lasting change starts.