Fungicide Resistance

Frogeye leaf spot on soybean plant
Figure 1: Frogeye leaf spot of soybean (FLS) disease caused by foliar pathogen, Cercospora sojina, (Photo courtesy: Tamra Jackson-Ziems/UNL)

Nebraska Soybean Foliar Fungicide Use Survey

March 17, 2021
Offered until May 31, the foliar fungicide use survey will help UNL researchers determine future Extension programming to best meet the needs of soybean growers and other agribusiness professionals.

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Lesions on Leaves

Fungicide Resistance and Management of Frogeye Leaf Spot of Soybean in Nebraska

June 24, 2020
The results from field trials suggest an integrated disease management approach including tillage (when practical), crop rotation, resistant varieties, seed treatment, and timely application of mixed-mode of action fungicides provides the best control.

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What’s New in Plant Pathology

March 19, 2020
Fungicide resistance was confirmed in soybean samples from 10 Nebraska counties infected with the frogeye leaf spot pathogen. Tar spot, a fungal disease of corn, has been confirmed in numerous western Iowa counties and is likely to reach Nebraska in 2020.

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Frogeye leaf spot
Figure 1. Frogeye leaf spot on soybean

Frogeye Leaf Spot in Northeast Nebraska

August 19, 2019
Moderate to severe frogeye leaf spot is being reported on soybean in northeast Nebraska. Pathogen resistance to QoI fungicide is suspected in two fields. If you suspect resistance, contact the author for possible testing.

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Frogeye leaf spot
Frogeye leaf spot

Frogeye Leaf Spot Resistance Increasing in Soybean

February 21, 2018
While not close to Nebraska yet, fungicide-resistant frogeye leaf spot has been confirmed in eastern Iowa. Ward off problems here by implementing integrated management practices.

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