In order to screen the nematocides with excellent efficacy against Ditylenchus destructor and suitable for application,the efficacies and economic benefits of 6 kinds of nematocide on Ditylenchus destructor were evaluated by root-dipping method in three different counties of Henan Province.The results showed that the sweet potato seedlings grew vigorously and the survival rates of each treatment were more than 95％.The efficacies of abamectin 5％CS,phoxim 30％CS and abamectin·fosthiazate 21％EW on Ditylenchus destructor were more than 80％,and the control effect of phoxim 30％CS was the best.All nematocides could reduce the rates of diseased plant and potato,increase the yield of healthy potatoes,with an averaged income of 107.50-855.00 yuan per 667 m2.Phoxim 30％CS was the most economical and effective nematicide against Ditylenchus destructor on sweet potato and could be promoted and applied in suitable areas.
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