SEPTORIA NODORUM LEAF AND GLUME BLOTCH

Description: Stagonospora nodorum leaf blotch begins as small chocolate?brown spots that enlarge into lens?shaped lesions with dark brown margins. As the season progresses the lesions coalesce giving the leaf a blotchy appearance. Some wheat varieties develop dark brown centers in the tan leaf lesions. Glume blotch occurs on the wheat heads as irregular brown blotches on the glumes, usually starting near the tips of the glumes.
Location: Widespread throughout Ohio.
Time of attack: Stagonospora nodorum attacks wheat in mid to late May and June during rainy periods when temperatures begin to warm (68° ? 80° F).
Management:
· Resistant varieties
· Crop rotation
· Delay planting
· Foliar fungicide application when 1-2 lesions present on leaf below flag leaf