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Dowco® 269: A New Systemic Fungicide for Control of Phytophthora parasitica of Tobacco. R. L. Noveroske, Product Technical Specialist, Ag-Organics Department, Dow Chemical U.S.A., P.O. Box 1706, Midland, Michigan 48640; Phytopathology 65:22-27. Accepted for publication 9 July 1974. DOI: 10.1094/Phyto-65-22.

Dowco 269® [2-chloro-6-methoxy-4- (trichloromethyl)pyridine] exhibits unusual in vivo activity against Phytophthora parasitica of tobacco. Long-term control is obtained when the chemical is applied in transplant water. The following evidence indicates Dowco 269 systemically controls P. parasitica of tobacco: (i) in vivo effectiveness markedly exceeds in vitro activity; (ii) therapeutic activity can be demonstrated; and (iii) foliar applications are effective in controlling this root disease, supporting basipetal translocation. The versatility of a material effective as an at-plant or post-plant treatment offers new opportunities for control of this serious disease.

Additional keywords: tobacco black shank.