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Disease Control and Pest Management

Pesticide-Plant Disease Interactions: the Influence of Aldicarb On Growth of Rhizoctonia solani and Damping-Off of Sugar Beet Seedlings. Ned Tisserat, Research Assistant, Department of Botany and Plant Pathology, Colorado State University, Fort Collins, CO 80523, Present address of senior author: Department of Plant Sciences, Texas A & M University, College Station, TX 77843; Jack Altman(2), and C. Lee Campbell(3). (2)(3)Professor, and Graduate Assistant, respectively, Department of Botany and Plant Pathology, Colorado State University, Fort Collins, CO 80523. Phytopathology 67:791-793. Accepted for publication 14 December 1976. Copyright 1977 The American Phytopathological Society, 3340 Pilot Knob Road, St. Paul, MN 55121. All rights reserved.. DOI: 10.1094/Phyto-67-791.

Addition of aldicarb [2-methyl-2-(methylthio) propion-aldehyde, O-(methylcarbamoyl) oxime] to soil infested with Rhizoctonia solani significantly increased damping-off of sugar beet seedlings in greenhouse and growth chamber studies. Seedling survival was lowest in steamed soil inoculated with R. solani barley grain inoculum at 400 μg/g and amended with aldicarb at 16 μg/g. In steamed soil inoculated with R. solani inoculum at 200 μg/g, colonization of mature bean hypocotyl segments after 72 hr was increased with aldicarb at 8 μg/g, but not with 32 μg/g. Linear growth of R. solani was reduced on potato-dextrose agar amended with aldicarb at 4, 8, 16, and 32 μg/ml.

Additional keywords: nematicide predisposition, Beta vulgaris, aldicarb, R. solani.