关键词: 毒死蜱, 滞留效果, 相对密度下降率

Abstract: Objective To study the effect of Empire 20 in field for cookroach control and to evolute the applied prospect of chlorphrifos in China. Methods Three kinds of field,one restaurant(A1),one eatery(A2) and one bakery(A3) and two concentration Empire 20 (100 fold and 50 fold dilurtions) were selected,the cockroach densities of experiment and control were tested before and after spraying with sticktrap adhesive method,and the longlasting efficacies were observed. Results The longlasting efficacy was poor effect for cockroach at A1 and A2 experimental area. The longlasting period was about ten days for A3,and met the need for field control. Conclusion The efficacy of killing and longlasting efficacy of Empire 20 for cockroach will be better if the longlasting insecticides is reserved at the environment.