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Effect of Dinitramine and Trifluralin on Growth, Reproduction, and Infectivity of Aphanomyces euteiches. C. R. Grau, Department of Plant Pathology, University of Minnesota, St. Paul, MN 55108, Present address of senior author: Department of Plant Pathology, University of Wisconsin, Madison, WI 53706; Phytopathology 67:551-556. Accepted for publication 15 October 1976. DOI: 10.1094/Phyto-67-551.

Aphanomyces euteiches produced less hyphal growth, fewer zoospores, and had a lower zoospore germination percentage when grown in dinitramine and trifluralin solutions than in the absence of these herbicides. Root disease severity was less and fewer plants died when zoospore inoculum (10,000 zoospores/ml) was amended with dinitramine and trifluralin (0.12 μg/ml), than when inoculum was not amended. Dinitramine was more effective than trifluralin in altering growth and reproduction of A. euteiches and in lowering disease severity.

Additional keywords: herbicides, Pisum sativum, root rot, soil-borne plant pathogen.