Abstract: The toxicity of EB-82 aphidicide with six different concentration gradients to peach aphid（Myzus persicae Sulzer） and its relationship with temperature and humidity were studied and compared. The results indicated that the mortality of peach aphid increased with the rising of the concentration of EB-82 aphidicide. In addition, the mortality of peach aphid was significantly different between different concentration gradients. The LC₅₀ of EB-82 aphidicide to peach aphid was 420 times dilution while the LC₇₅ was 300 times. Noticeably, the mortality to the peach aphid was higher than 75% if the dilution times lower than 300. The toxicity EB-82 aphidicide to the peach aphid was within a certain humidity range, and the influence of temperature was not obvious.

Key words: EB-82 aphidicide, peach aphid（Myzus persicae Sulzer）, bioassay, temperature and humidity, toxicity