Interaction BetweenMeloidogyne haplaandVerticillium albo-atrumin the Verticillium Wilt Disease of Potato

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Abstract
In the field and greenhouse, M. hapla increased the severity of Verticillium wilt of potato [Solanum tuberosum]. In the greenhouse V. 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.degree. C, but they did not differ at 30.degree. 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.

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