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NW Iowa | If you can feel a slight raise or bump, then it is common rust. Another possibility is anthracnose leaf blight.
CORN
Disease Name: Anthracnose Leaf Blight
Pathogen: Fungus. Colletotrichum graminicola
Symptoms: Small, oval to elongated water-soaked lesions enlarge to become brown, spindle shaped spots with yellow to reddish-brown borders. Lesions may coalesce and blight entire leaves. Older lesions will turn gray in the center with small black specks (acervuli with sterile black hairs). Leaf blight may be followed by top kill and stalk rot. Leaf blight rarely causes large yield losses. Stalk rot phase is most important (see Anthracnose Stalk Rot).
Conditions: Favored by cool to warm, wet, humid weather, continuous corn with reduced tillage.
Inoculum Survival: Infected crop residue (leaves, leaf sheaths and stalks), seed (endosperm).
Inoculum Dispersal: Airborne spores.
Management: Resistant hybrids, rotate corn with nongrass crops. Cleanly plow under infected residue.
Edited by hawkfan 7/13/2013 17:56
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Corn Leaf Disease Gurus (pic)
