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north central Ohio | I generally don’t use chatgpt but thought your image might be interesting to put in and see what disease it came up with. To me almost looks some kina of fertilizer burn but being it isn’t clear across plot probably not it. We get northern here and even severe it doesn’t look like that. Here is what chatgpt said with an explanation. Not sure I agree though as we have a lot of gls here and never seen it present in that way but it does have the square edges of gray leaf spot.
Chatgpt answer:
From the photo, this looks most consistent with gray leaf spot (GLS) rather than northern corn leaf blight or a nutrient issue.
Here's why:
The lesions are long, rectangular, and bounded by the leaf veins, giving them a blocky appearance.
Many lesions have coalesced into a large tan-gray dead area.
There are numerous tiny dark specks within the dead tissue, which are often fungal structures produced by the gray leaf spot pathogen.
The disease appears to be on a leaf around ear height, which is a common location for GLS to become severe.
It is less likely to be:
Northern corn leaf blight: lesions are usually cigar-shaped with rounded ends rather than rectangular.
Goss's wilt: would typically show water-soaked lesions with shiny bacterial exudate ("freckles").
Anthracnose leaf blight: usually produces irregular lesions with dark margins and is often more common on lower leaves early in the season.
Edited by pigfarmer82 7/31/2026 06:00
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Corn disease?
