Tar Spot (Stroma)




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The fungus that causes tar spot produces small, round to semi-circular, raised black structures called stromata. The structures form on both the upper and lower surfaces of corn leaves. In severe cases, stromata may also be observed on leaf sheaths and husks. Occasionally, stromata may coalesce and form small lines or striations across the leaf surface.

For more information on eyespot, see the Crop Protection Network article here

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