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Predicted Wet Summer Favorable for Frogeye Leaf Spot

June 2, 2017

The Climate Prediction Center predicts above-average rainfall over the next three months in the Central and Northern Plains. High rainfall and warm summer temperatures favor frogeye leaf spot (FELS) development in soybeans. The University of Nebraska-Lincoln adds that rain, in addition to wind, can also help disperse FELS spores, spreading the infection.

This agronomic photo shows untreated and Trivapro R3 soybean leaves.

Untreated (top) and Trivapro R3 (bottom)

Source: Joe Wuerffel, R&D.

*Based on 9 large plot trials in the U.S. in 2016

FELS infection is most visible in the younger, more vulnerable leaves of the upper canopy. Initially, symptoms appear as small, dark spots on the leaves and eventually enlarge and become gray to brown with a reddish purple border.

With strobilurin resistance on the rise, treating FELS at the R3 growth stage with a fungicide that contains multiple modes of action is an effective management option. In addition to providing preventive and curative FELS control, Trivapro fungicide contains three proven modes of action and has crop enhancement benefits that help plants produce stronger pods with larger beans.

Ryan Larson, a grower and retailer in Blooming Prairie, MN, states that with the wet, saturated conditions we had, Trivapro did a good job of keeping the soybeans clean and free of frogeye leaf spot.

Visit the ‘Not Afraid To Work’ webpage for yield data and trial-by-trial performance results.

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