If you drive past a farm at sunrise these days, you might see a farmer hunched over a seed planter, running a hand through a bucket of pale coated seeds like a wizard checking a potion. Every time that happens, there’s a good chance that bucket has been treated with one of the products we spend most of our days talking about: seed treatment fungicides. Let’s cut through the hype and the half-truths floating around farming groups and backyard garden forums—yes, there absolutely are fungicides made specifically for seed treatment, and they’re one of the quietest, most powerful tools we have to keep crops healthy before they even push through the soil. Fungicide
I’ve been in this game for 12 years, starting on a small commercial farm in southern Illinois and moving into supplying specialized fungicide formulations to growers across the Midwest. Back when I first started, seed treatment was an afterthought—farmers would dust their corn or soybean seeds with a generic fungicide if they remembered, and most of the time it did nothing because it didn’t stick or protect the right threats. Now? It’s a $2 billion global market, and for good reason.
Let’s start with the basics that matter to anyone who’s ever placed a seed in the ground. Seeds are fragile. They don’t just have to sit in soil and wait for water and sun—they’re surrounded by a whole community of microbes, some helpful, some not. The bad ones? They include things like Pythium, Phytophthora, Fusarium, and Rhizoctonia. These aren’t just “mold” in the generic sense—they’re soil-borne pathogens that feed on the seed’s stored energy before it can even send out a root. If a seed gets attacked by Pythium in cold, wet soil in April, it can rot before it ever germinates. That’s a stand loss, and stand loss early in the season can cost a farmer 10 to 20 bushels per acre before they even pull a single combine harvester.
Seed treatment fungicides are different from the big spray fungicides you see applied mid-season to corn or wheat. They’re formulated to stick to the seed coat, not wash off when the seed is in the planter or sitting in wet soil. They’re also tailored to be taken up by the emerging seedling, so they protect the young root system for the first 2 to 4 weeks when it’s most vulnerable. Think of it as a bodyguard for the seed—only it’s not guarding against people or burglars, it’s guarding against tiny, invisible fungi that can ruin a whole planting before it even gets started.
Now, I know what a lot of growers are thinking: “Do I really need this? I rotate crops, I till my fields, that should keep pathogens down.” Crop rotation and tilling are critical, but they don’t eliminate these pathogens. Pythium can survive in soil for years, even when you’re planting a non-host crop. And in recent years, we’ve seen more and more cases of Fusarium and other pathogens developing resistance to older, single-mode-of-action fungicides. That’s why we formulate seed treatments with different modes of action—sometimes two or three, mixed together—so pathogens can’t adapt as easily.
I recently worked with a 3,000-acre corn and soybean farmer in Indiana who had a terrible season in 2021. His field had heavy stand loss because of late blight, and he lost about a quarter of his planting. The next year, he switched to our seed treatment for his soybeans and a competitive product for his corn. His stand that year was 98% complete, and he ended up with 18 more bushels per acre than his five-year average. He told me it was the cheapest input he’d bought all year—because a 10-bushel per acre gain pays for the treatment three times over.
But it’s not just field crops. Vegetable growers, especially small-scale specialty ones, have caught on too. Last month, I met a family growing heirloom tomatoes for a farmers’ market in Ohio who was losing 30% of her tomato seedlings to damping-off (that’s the term for seedling rot from soil fungi). She tried everything—neem oil, homemade compost, even letting the soil dry out between waterings—until she tried a small batch of our tomato-specific seed treatment. She said she now has fewer than 5% of her seedlings dying, and she’s doubled her crop.
Now, let’s get into the science, because I don’t want to oversimplify this. Seed treatment fungicides aren’t a one-size-fits-all product. We have different formulations for different crops, different soil types, even different regions. For example, the fungicides that work on corn against Fusarium graminearum (the cause of head scab) are different from the ones that protect soybeans from Rhizoctonia solani, which causes root rot. We also take into account the soil temperature at planting time—if a farmer is planting in cold, wet soil, we’ll recommend a treatment with stronger activity against Pythium, because that pathogen thrives in those conditions.
Another thing that sets seed treatment fungicides apart: they’re low-rate applications. You’re not spraying gallons of product over acres of field—you’re coating each individual seed with a tiny amount of fungicide, measured in milligrams per seed. That means less product overall, less runoff into waterways, and lower environmental impact than foliar sprays later in the season. A lot of people don’t talk about that, but it’s a big deal for us as suppliers—we work hard to make products that are effective for growers and safe for the environment.
I also want to address the biggest misconception I hear all the time: that seed treatment fungicides can “cure” every problem once the plant is established. No, they can’t. Once the seedling’s root system is big enough to fend for itself, the fungicide breaks down, and that’s when mid-season scouting and sprays come in. Think of it as an insurance policy, not a miracle cure. You don’t buy car insurance because you expect to crash—you buy it to protect you if something goes wrong. That’s exactly what seed treatment fungicides do for seeds.
Over the past few years, we’ve also started developing seed treatment products that combine fungicides with other beneficials, like biologicals. These are living microbes that colonize the root system and help protect against pathogens, plus they improve nutrient uptake. It’s a hybrid approach that’s become really popular with growers who want to reduce their use of synthetic chemicals, while still getting the protection they need. Last year, we launched a biological seed treatment for wheat that’s been tested in 12 states, and early data shows it reduces Fusarium head blight by 25% and increases yields by 7 bushels per acre, on average.
But here’s the thing I tell every grower I work with: not all seed treatment fungicides are created equal. A lot of big ag companies sell generic formulations that cut corners on formulation technology—they don’t stick well, they don’t release at the right time, or they use older modes of action that pathogens are already resistant to. That’s why partnering with a supplier that has on-staff agronomists who can help you match the right product to your specific fields is so important. We don’t just sell a bag of fungicide—we work with you to look at your soil history, your planting dates, your crop rotation, and recommend a treatment that makes sense for your operation.
A few months ago, a small organic vegetable grower reached out to us, worried because she had to abandon half her pepper crop the year before due to seedling rot. She was nervous about using synthetic products, so we recommended our biological-based seed treatment for peppers, which is OMRI-listed for organic production. This past season, she told me she planted 10 acres of peppers and lost fewer than 2% of her seedlings. She was able to sell almost all her crop at the local farmers’ market, whereas the year before she’d only been able to sell half. That’s the impact this can have, not just on large commercial farms, but on small businesses and family operations too.
I know farming is hard. You put in long days, you invest thousands of dollars in seed, fertilizer, equipment, and labor, and one bad season can wipe out years of progress. Seed treatment fungicides aren’t the answer to every problem, but they’re a tool that works when used correctly. For too long, growers have treated seed treatment like an afterthought, something they can skip if they’re on a tight budget. But when you do the math, the cost of a good seed treatment is usually $5 to $10 per acre, and the payoff in saved seed, higher stands, and better yields is far more.
If you’re a grower who’s never used seed treatment, or if you’ve tried products in the past that didn’t work, I want to invite you to talk to us. We don’t push one-size-fits-all solutions—we take the time to learn about your operation, your challenges, and your goals, and we recommend a treatment that fits. Whether you’re planting corn, soybeans, wheat, vegetables, or specialty crops, we have formulations designed to protect seeds from the pathogens that can derail your season before it even starts.
At the end of the day, farming is about giving seeds the best possible start. You wouldn’t plant a seed and leave it unprotected from pests and disease later in the season—why would you do it for the first, most vulnerable weeks of growth? Seed treatment fungicides are a tried-and-true, science-backed way to give your seeds that head start.
If you’re interested in learning more about our seed treatment fungicides, or if you want to chat about what might work for your fields, feel free to reach out to our sales team to set up a consultation. We’re always happy to work with growers, no matter the size, to find solutions that work for them.
Pesticide Formulations References
Agrochemicals Association. (2022). Global Seed Treatment Market Report.
American Phytopathological Society. (2021). Soil-Borne Pathogen Management in Field Crops.
Johnson, A. et al. (2023). Efficacy of Seed Treatment Fungicides Against Fusarium and Pythium in Soybeans. Crop Protection, 168, 106245.
US Department of Agriculture. (2022). Stand Loss and Yield Impacts from Early-Season Pathogens in Midwestern Row Crops.
World Health Organization. (2021). Sustainable Use of Seed Treatment Fungicides in Agriculture.
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