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Brown Leaf Spot (fungus)

Brown Leaf Spot (fungus)
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Caused by fungi in the genera Bipolaris, Drechslera, and Exserohilum. It first enters the leaves, producing small brown spots. As the disease worsens, the spots on leaf blades expand and produce a dark purplish-red oval border around a tan center. The spots enlarge until the entire width of the leaf blade is covered.