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Three Ways to Fight Frogeye Leaf Spot

May 20, 2022
soybean leaf infected with frogeye leaf spot

Soybean crop infected with frogeye leaf spot

As we enter the summer months, much of the South will experience hot, humid weather that creates the perfect conditions for diseases like frogeye leaf spot (FELS) to develop. The Crop Protection Network estimates that FELS can cause yield losses of up to 35% under the right conditions. Severe disease outbreaks early in the season or shortly after flowering have the highest impact on yield, whereas late-stage disease outbreaks after R5 can have a reduced impact on your bottom line.

FELS can be difficult to diagnose and is often mistaken for other diseases and disorders such as herbicide injury or target spot. In addition, strobilurin-resistant FELS has been confirmed in 18 states across the South and Midwest, according to North Carolina State University. If your fields have a history of FELS or you see signs of disease after using a strobilurin-containing fungicide, contact your local agronomist or extension service to see if strobilurin-resistance may be an issue in your field.

Staying Ahead of the Disease

You still have time before signs of frogeye leaf spot begin to develop. Consider these tips to prevent the threat of FELS:

  1. Consider crop rotation

The fungus that causes FELS survives on residue, so rotations to a different crop can prevent the likelihood of residue surviving from season-to-season. Tilling can also help break up the remaining residue and reduce the amount of fungus.

  1. Keep an eye on the weather

Like many foliar diseases, frogeye leaf spot thrives in warm (80-85°F) and humid conditions. Keep in mind that younger leaves are more susceptible to the disease and that symptoms become visible 7-14 days after infection.

  1. Provide effective protection

Scout early and often for signs of disease in your fields and consider adding a high-performing fungicide to your disease management plan.

The best way to stay ahead of FELS is to include a preventive fungicide in your disease management plan, and we recommend Miravis® Top fungicide. Custom-built with 2 effective active ingredients with proven activity against strobilurin-resistant pathogens, Miravis Top helps you stay ahead of resistance and protect yield potential.

Plus, with excellent plant-health benefits, Miravis Top helps soybeans stay cleaner and greener under stressful conditions so you can focus your attention on other important areas of your operation.

Consider Miravis Top and talk to your local retailer or Syngenta sales representative to see how it can help you take control of the toughest diseases.

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