AgWeb released information on May 5 about the importance of early detection and identification of gray leaf spot in corn. The disease often begins developing low in the canopy before it becomes visible across a field, making timely scouting essential to prevent yield loss.
Gray leaf spot can spread quickly under warm, humid conditions and significantly reduce crop yields if not managed promptly. Early identification allows farmers to make informed decisions about fungicide applications and avoid unnecessary treatments.
According to AgWeb, infections typically start on lower leaves two to three weeks before tasseling, especially in fields with corn residue where the disease can overwinter. The publication notes that symptoms first appear as small tan necrotic spots surrounded by faint yellow halos on lower leaves. As the disease progresses, these lesions expand into long rectangular shapes confined between leaf veins and may eventually kill entire leaves if severe.
The article explains that distinguishing gray leaf spot from similar diseases such as bacterial leaf streak is crucial for effective management. While gray leaf spot lesions are straight-edged and stay between veins, bacterial streaks tend to have wavy edges that cross veins and appear more smeared across the surface.
AgWeb authors publications on topics ranging from commodity markets to farm leadership strategies, influences farming culture by promoting leadership programs and community advocacy in agriculture, presents awards such as the Top Producer Awards and partners with organizations like the American Soybean Association for conservation honors, functions as a subsidiary of Farm Journal, reaches agriculture professionals through extensive online content and features, and aims to supply farmers with essential news, market updates and educational resources to improve agricultural practices according to the official website.
Experts recommend consulting seed retailers or extension agents for support when managing this disease. “A few extra minutes spent scouting at the right time can make all the difference,” AgWeb said.
