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Disease Control and Pest Management

Chemical Control of Stem Rot of Rice in California. L. F. Jackson, Postgraduate Research Plant Pathologist, Department of Plant Pathology, University of California, Davis, CA 95616; R. K. Webster(2), C. M. Wick(3), J. Bolstad(4), and J. A. Wilkerson(5). (2)(4)Professor, and Research Associate, respectively, Department of Plant Pathology, University of California, Davis, CA 95616; (3)Farm Advisor, Agricultural Extension Service, Butte Co., CA; (5)Director, Field Research and Development, Southwestern Region, Thompson-Hayward Chemical Company, Visalia, CA 93277. Phytopathology 67:1155-1158. Accepted for publication 9 March 1977. Copyright 1977 The American Phytopathological Society, 3340 Pilot Knob Road, St. Paul, MN 55121. All rights reserved.. DOI: 10.1094/Phyto-67-1155.

Control of stem rot disease of rice with triphenyltin hydroxide (TPTH) was demonstrated in 3 yr of field tests. A single application of TPTH at the rate of 1.12 kg/hectare (ha) at the midtillering stage resulted in significant reductions in disease severity which were accompanied by increases in yield ranging from 6-25%. Tests indicated that the fungicide reduced the number of early infections, delayed disease progress, and decreased final disease severity. The importance of an experimental design utilizing separate water systems for evaluating treatments for the control of stem rot of rice is discussed.

Additional keywords: Sclerotium oryzae, Oryzae sativa.