Resulr: In Chifeng City, the resistance for house fly to deltamethrin was trending downwards, but to cypermethrin remained still serious.To DDVP was in middle level.

• 结果:赤峰市城区家蝇对氯氰菊酯、溴氰菊酯的性均为最高抗,但对氯氰菊酯的抗性呈上升趋势,而对溴氰菊酯抗性发展趋势较缓慢,对敌敌畏的抗性为中抗。