生物防治可下定义为藉捕食性和寄生性昆虫与昆虫病原体的作用,把另一生物种群的密度,维持在没有它们时将会出现的密度水平之下。另一种定义是,研究和利用捕食性昆虫寄生性昆虫及昆虫病原体以达到节制其寄主种群密度的目的。害虫生物防治的首批最好的例子之一,于1888年在加州出现,那时自澳大利亚引进一种捕食性甲虫和寄生 Biological control can be defined as the action of predatory and parasitic insects and entomopathogenic agents, keeping the density of another biological population below the density levels that would otherwise occur in the absence of them. Another definition is to study and use predatory insect parasitic insects and insect pathogens in order to control its host population density purposes. One of the first good examples of pest biological control appeared in California in 1888 when a predatory beetle and parasitism was introduced from Australia