Abstract:

The efficacy of three different types and six different kinds of insecticides were evaluated against aphids in watermelon field，and carried on the variance analysis by using new multiple range method, it screened the best insecticides against the aphids in watermelon field. The results showed that six kinds of tested insecticides including 1% matrine SL, 0.32% azadirachtin EC, 20% acetamiprid Hong Ding WP, 5% hypertonic imidacloprid EC, 2.5% efficient cyhalothrin AS and 48% chlorpyrifos EC could be used, 20% acetamiprid Hong Ding WP was optimal for comprehensive efficacy, 48% chlorpyrifos EC was worst for efficacy, the efficacy of different types of insecticides showed different features, we should choose flexibly suitable varieties of pesticides according to role of the characteristics of various pesticides and occurrence of aphis in production.