Corn

Gray Leaf Spot of Corn Gray leaf spot (GLS)  caused by Cercospora zeae-maydis is considered the world’s most yield-limiting disease on corn. All corn hybrids, regardless of type, have some susceptibility to this disease. Disease Symptoms Early GLS symptoms include brown or tan spots 0.2 inches wide by 0.4-0.8 inches long, which span the region between the leaf […]