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.