Abstract:Cotton leafhopper, Empoasca biguttula ,is an important pest damaging cotton and aubergine in South China.Based on the field investigation in winter and feeding experiments with Malva crispa in laboratory,it was found that the nymphae of the insect began to die under 10℃ and the adult moved slowly under 15℃ and lost activity under 6℃.Neither the adult nor the nymphae could survive at 0.1℃.For the two stages of egg and nympha,the development threshold temperatures were estimated to be 13.2℃ and 16 8℃,a...