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Interaction Between Meloidogyne hapla and Verticillium albo-atrum in the Verticillium Wilt Disease of Potato. B. J. Jacobsen, Assistant extension plant pathologist, Department of Plant Pathology, University of Minnesota, St. Paul, MN 55108, Present address: Department of Plant Pathology, University of Illinois, Urbana, IL 61801; D. H. MacDonald(2), and H. L. Bissonette(3). (2)(3)Associate professor, and professor, Department of Plant Pathology, University of Minnesota, St. Paul, MN 55108. Phytopathology 69:288-292. Accepted for publication 1 September 1978. Copyright 1979 The American Phytopathological Society. DOI: 10.1094/Phyto-69-288.

In the field and greenhouse, Meloidogyne hapla increased the severity of Verticillium wilt of potato. In the greenhouse Verticillium albo-atrum was isolated up to 2 wk earlier from petioles of plants grown in soil with both M. hapla and V. albo-atrum than from plants grown in soil and inoculated with the fungus alone. Nematode populations were higher in root systems of plants infected with the fungus than on plants infected with the nematode alone at 24 C, but they did not differ at 30 C. In fields treated with benomyl (methyl 1-[butylcarbamoyl]-2-benzimidazole carbamate), phenamiphos (ethyl 4-[methylthio]m-tolyl isopropylphosphoramidate), and carbofuran (2,3-dihydro-2,2 dimethyl-7-benzofuranol methylcarbamate) of soils naturally infested with M. hapla and V. albo-atrum, the correlation was high (P = 0.05) among lower yields, disease index, loge M. hapla soil populations, loge V. albo-atrum soil populations, and loge M. hapla loge V. albo-atrum soil populations for the potato varieties Norland and Norgold when data were analyzed by multiple regression analysis.