Results:From low to high degree of resistance, for mosquitoes, the insecticides are deltamethrin, permethrin, DDVP, and for flies are deltamethrin, cypermethrin, permethrin, and DDVP;
House flies had evoluted high resistance to DDVP in Yizheng and Yangzhong. In Yizheng, house flies had evoluted highest resistance to deltamethrin, while in Yangzhong the resistance is low.
If deltamethrin be used with prescript dose in paddyfield, it will have no harmful effect on fish breeding in paddy field and nearby fish pond, but will be more harmful to shrimp.
