Blog Post

Protect Corn Now Before Gray Leaf Spot Strikes

This agronomic photo shows corn infected by gray leaf spot.

Gray leaf spot (GLS) has become one of the most yield-limiting diseases for corn in multiple regions across the U.S.

GLS pathogens are known for overwintering in crop residue – it only takes a combination of warm and humid weather for GLS to spread and infect a new plant.

When scouting, Purdue University advises growers to check corn leaves for small, pinpoint lesions surrounded by yellow halos. Further along in development, lesions become long, narrow and rectangular, and can vary from brown to gray in color.

Although scouting is a crucial part of disease diagnosis, the incubation period for gray leaf spot can be 27 days or more, so crops can be infected for a long period of time before lesions appear. This can lead to significant, unexpected yield loss.

Syngenta encourages growers to make proactive disease management decisions this season and treat corn fields before GLS hits to minimize the risk of damage and yield loss. This is the most effective way to avoid damage that could hinder photosynthesis.

Syngenta recommends applying Trivapro® fungicide for preventive and curative disease control to maximize yield and profit potential this season.

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