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Cedric Gillott(1980)认为,根据生态学的原则可将害虫分为R类害虫(R—pests)、K类害虫(K—Pests)和中间型害虫(inter-mediate pests)。R类害虫的特点是具有潜在的高速增长种群及很快扩散和发现新食物源的能力以及杂食性。R类害虫虽然有众多的天敌,但因具有大量繁殖的潜在性,因此,生物防治无效。使用杀虫剂是防治R类害虫的最好方法。K类害虫是另一个极端。这类害虫的特点是繁殖力相当
According to Cedric Gillott (1980), pests can be classified into R-pests, K-pests and inter-mediate pests according to ecological principles. R pests are characterized by the potential for rapid population growth and rapid spread and discovery of new food sources as well as omnivores. Although there are many natural enemies of R type pests, biological control is ineffective due to the potential for large numbers of breeding. The use of pesticides is the best way to control R pests. K pests are the other extreme. The pest is characterized by a similar fertility