Cultural practices and epidemics of sheath blight of rice
1995
Raymundo, A.D. | Pantua, M.R. | Baria, A. | Teng, P.S. (Philippines Univ. Los Banos, College, Laguna (Philippines))
A 3-season crop sequence study, involving onion, garlic, mungbean, and sorghum, with the objective of finding out if sheath blight is suppressed after an initial rice cropping inoculated with Rhizoctonia solani, was undertaken at the PhilRice experiment station in Munoz, Nueva Ecija [Philippines]. Based on sheath blight incidence on rice cultivar IR72 during the third season, significant differences were observed among treatments with onions showing a particularly suppressive effect. In another study covering three seasons involving cultural practices including sanitation and fallowing, no significant differences were observed among treatments in terms of sheath blight incidence. It indicated that a longer period of time is needed for cultural practices such as those aforementioned to show significant effects. A study on the effect of soil types, collected from different regions in the Philippines, on R. solani showed significant differences in sclerotial viability. Chemical analysis revealed that loam soil types decreased survival while clay and clay loam types exerted favorable effects. High Zn content was found associated with decreased survival while high P and high Mg were related to increased survival
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