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Chemical Control of Black Shank of Tobacco. John J. Reilly, Assistant Professor, Virginia Polytechnic Institute and State University, Southern Piedmont Research and Continuing Education Center, Blackstone, VA 23824. Plant Dis. 64:274-277. Accepted for publication 10 October 1979. Copyright 1980 American Phytopathological Society. DOI: 10.1094/PD-64-274.

Selected experimental fungicides were tested for efficacy in controlling black shank of tobacco, a soilborne disease incited by Phytophthora parasitica var. nicotianae. The chemicals were most effective as transplant water treatments when used on flue-cured cultivars with some resistance to black shank and less effective on susceptible dark-fired tobacco. Propamocarb and metalaxyl at 3.4 and 0.3 kg a.i./ha, respectively, reduced losses by more than 75% compared with the controls. Phenamiphos and aldoxycarb nematicides did not affect efficacy of the fungicides in the combinations tested. Other than the fumigant materials, all fungicides were systemic with specific activity toward Phycomycetes.