The Laiyang population which having been applied pesticide for yearshad had resistance to Omethoate,Chlordimeform Parathion,Dicofol,Dimethoate and Monocrotophos.

• 连年多次施药的莱阳种群对氧化乐果、杀虫脒、对硫磷、三氯杀螨醇、乐果和久效磷产生了抗药性。