抗药性的发展是农业科学家所面临的虫害防治中最严重的问题之一。所谓抗药性是指某一品系昆虫能忍受杀虫剂一定剂量的能力,这个剂量对同种正常昆虫种群中大多数个体是足以致死的。一般来说,当昆虫种群中对药剂敏感性差异达10倍时,就认为产生了抗药性,而差异不到10倍则称之为耐性。 The development of drug resistance is one of the most serious problems that agricultural scientists face in pest control. The so-called resistance refers to the ability of a certain strain of insect to tolerate a dose of insecticide which is sufficient to kill most individuals in the same normal insect population. In general, resistance is considered to have developed when the insects’ susceptibility to insecticides is 10-fold different, while differences less than 10-fold are called tolerance.