世界上昆虫种类有100万种以上,占动物界的绝对优势。在这群数量诰瀚的小动物中,既有益虫(如蚕、蜜蜂等,天敌昆虫也是益虫的一类),也有害虫。世界上已知重要的害虫有上万种,约占昆虫种类总数的1％左右,其它99％的昆虫无害。其所以无害,主要是因为它们受到自然界天敌(广义的包括病原微生物 There are over 1 million species of insects in the world, accounting for the absolute superiority of the animal kingdom. In this population of Hannu’s small animals, both beneficial insects (such as silkworms, bees, etc., natural enemies are also beneficial insects), but also pests. There are tens of thousands of known pests in the world, accounting for about 1% of the total number of insect species, while the other 99% are harmless. They are harmless, mainly because they are affected by natural enemies of nature (in a broad sense, including pathogenic microorganisms