Is this soil-born disease affecting your fields this season? If so, you are not alone. Traveling around both Missouri and Iowa, I have seen it just about everywhere. I hear from my coworkers that it is in Illinois, too. So why has it hit so hard this year?
1. Planting time conditions – early planting dates into cool, wet soils.
2. Conditions at blooming stage.
3. Cooler, damp conditions throughout reproductive stage of soybean plant.
4. Cyst nematodes.
These are the reasons that we all are hearing, and we sure had them in this growing season. What these conditions do is trigger Fusarium in the soil to work much more efficiently to cause SDS and lower yields 20-40%, and in some cases, more.
Here is another theory. For the past ten plus years, we as producers have been using a lot of glyphosate in our bean production to control weeds. And, for the past five or so years, we have been battling resistant weeds with increased rates. According to Dr. Don Huber, Emeritus Professor of Plant Pathology Purdue University, the increased use of glyphosate is causing a buildup of the chemical in our soil.