Sensitivityof<italic>Sogatellafurcifera</italic>tocycloxapridatdifferenttemperatures

In order to clarify the sensitivity of Sogatella furcifera to cycloxaprid at different temperatures, the toxicity of cycloxaprid to S. furcifera at different temperatures from 18 ℃ to 32 ℃ was determined by leaf dipping method. The effects of temperatures on the secretion of honeydew and detoxification enzymes (EST, P450 and GSTs) were also detected. The results showed that cycloxaprid was a positive temperature coefficient insecticide. The toxicity of cycloxaprid against S. furcifera increased with temperature. The toxicity of cycloxaprid against S. furcifera at 32 ℃ was 15.6 times as high as that at 18 ℃. The feeding capacity and the amount of honeydew excretion increased with the increase of temperature. The activities of EST and P450 of S. furcifera also changed with temperature. With the elevation of temperature, the activity of EST increased first and then decreased. The P450 enzyme activity decreased at higher temperature. However, the activity of GSTs has no significant difference under different temperatures. The susceptibility variation of S. furcifera to cycloxaprid under different temperatures is closely related to its feeding capacity and detoxification activity (EST and P450). The above study provides a scientific reference for the rational use of cycloxaprid in the field under different environmental temperatures.