Objective To observe the efficacy of DDVP aerosol against Blattella germanica.
目的了解敌敌畏热烟雾剂对德国小蠊的杀灭效果。
The fly population density could be maintained low condition by spraying2.5% synergist ic ddvp.
以2。5%增效敌敌畏喷洒，可使蝇密度维持在较低水平。
The fly population density could be maintained low condition by spraying 2. 5% synergistic DDVP.
以2.5%增效敌敌畏喷洒，可使蝇密度维持在较低水平。
Results All the 7 field populations were found to have developed resistance to DDVP and propoxur.
结果7个种群对DDVP和残杀威均产生了不同程度的抗性。
The resistant groups of Culex pipiens pallens against DDVP have increased, so we should not use DDVP in the coming days.
结论：对敌敌畏的抗性种群已广泛产生，应限制使用。
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;
家蝇对常用杀虫剂的抗性由低到高依次为溴氰菊酯、 氯氰菊酯、氯菊酯、敌敌畏；
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.
仪征、扬中地区家蝇对敌敌畏产生高抗，仪征地区家蝇对溴氰菊酯最高抗，扬中地区则为低抗。
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.
仪征、扬中地区家蝇对敌敌畏产生高抗，仪征地区家蝇对溴氰菊酯最高抗，扬中地区则为低抗。
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