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Rhizoctonia Leaf and Sheath Spot

Two less common Rhizoctonia species, R. zeae and R. oryzae, cause the disease called Rhizoctonia leaf and sheath spot. It occurs during the summer when the temperatures are above 80°F. While overall symptoms may look like brown patch, the leaf symptoms are different. These pathogens cause a leaf spot that expands into a leaf blight. The entire leaf turns yellow or reddish-yellow and then brown, and it does not pull off the stem. The roots are not affected. This disease must be confirmed by a plant disease clinic prior to any control efforts.


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