Sheath spot of rice in the Philippines
1986
Shahjahan, A.K.M. | Mew, T.W. (International Rice Research Inst., Los Banos, Laguna (Philippines). Plant Pathology Dept.)
Diseased plants were collected and the causal organism was identified as Rhizoctonia oryzae Ryker and Gooch, which causes sheath spot of rice. It is a fast growing sterile fungus with pinkish pigmentation and produces small, pink, globose-flat sclerotia (0.5-1.5 mm) submerged in the medium. Often sclerotia coalesce to form a crust on the surface of the medium. The mycelium is thinner than that of R. solani. No sclerotia were observed in the infected plant tissues. The disease was present in about 10% of the fields surveyed. This is the first record of sheath spot in the Philippines
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