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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, tan to brown lesions with dark borders can develop that surround the stromata. These are known as fisheye lesions because of their appearance.
For more information on eyespot, see the Crop Protection Network article here.
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