EFFECT OF INSECTICIDES AND HERBICIDES APPLIED TO SOIL ON THE DEVELOPMENT OF PLANT DISEASES: II. EARLY BLIGHT AND FUSARIUM WILT OF TOMATO

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Abstract
The effects of several insecticides and herbicides on the development of early blight and Fusarium wilt of tomato were investigated. Young tomato plants were grown in sand to which solutions or suspensions of these chemicals were applied repeatedly before the foliage was inoculated with spores of Alternaria solani and either before or after the roots were inoculated with spores of Fusarium oxysporum f. lycopersici. On the basis of lesion counts, increased early blight development resulted from applications of lindane, 2,4-D, and isodrin, and decreased disease from endrin, MH, NPA, dieldrin, IPC, dalapon, demeton and aldrin. Lindane, isodrin, and dalapon increased the severity of Fusarium wilt whereas endrin, aldrin, TCA, DDT, and dinoseb reduced it. 2,4-D and MH affected wilt development in a susceptible and a resistant variety in different ways according to the time of application in relation to inoculation, but they did not alter the reaction of an immune variety.