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Tips to Stay Ahead of Frogeye Leaf Spot

January 21, 2021
This agronomic image shows frogeye leaf spot in soybeans

Frogeye leaf spot on soybeans

As you make your 2021 soybean management plans, factor in managing a disease that has become a greater economic threat over the last 10 years—frogeye leaf spot.

According to estimates by the Crop Protection Network, 2019 frogeye leaf spot losses in the South totaled 6.1 million bushels, with the percentage of losses heaviest in TN, KY, AR, LA and NC. If you include MS, where the disease also caused damage, this group of states lost more than $650 million in production in the last decade due to frogeye leaf spot.

In individual fields, the disease may not always result in heavy yield losses, but if you have warm, humid weather and a severe outbreak around flowering, you could risk yield losses of up to 35%.

Beating the Disease

As you make next year’s management plans, consider these tips to determine the best course of action if you have frogeye leaf spot concerns:

  1. Plant resistant varieties. When possible, planting a variety with resistance to the disease is often the most economical practice.
  2. Consider crop rotation & tillage practices. The fungus that causes frogeye leaf spot, Cercospora sojina, overwinters on soybean residue. Crop rotations that include corn, small grains or tillage to break up residue may help prevent severe problems.
  3. Watch the weather. Like many foliar diseases, frogeye leaf spot loves warm weather (80 – 85° F) and wet conditions. Keep in mind younger leaves are more vulnerable to infections and symptoms become visible 7 to 14 days after infection.
  4. Provide effective protection. Depending on the susceptibility of your variety and weather, a fungicide application may be necessary. Experts recommend avoiding fungicides with only a strobilurin (FRAC 11) due to resistance issues reported in most of the primary soybean-growing areas from southern LA northward to eastern KY, as well as many other states in the Mid-Atlantic and Midwest.

Custom Solutions

Creating a foolproof strategy to prevent losses from a disease like frogeye leaf spot can be challenging. Put your mind at ease and consider a tougher, customized solution for 2021. We recommend including Miravis® Top fungicide as part of your disease management program.

With 2 effective modes of action against both susceptible and strobilurin-resistant frogeye leaf spot, Miravis Top helps you stay ahead of further resistance development while controlling other difficult-to-control soybean diseases, including brown spot, target spot and more. In addition to effective control, Miravis Top delivers plant-health benefits you can depend on to help boost your profit potential.

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