目前,已知对农作物造成危害的害虫大约达一万种左右,其中大多数是昆虫。昆虫是动物中种类最多、分布最广、适应性最强、群体数量最大的一个类群。它们分布在植物、动物、土壤、水域中和食物仓库内,因居住和生活条件不同,根据食物选择可分为植食性、肉食性、腐食性、尸食性和粪食性5大类,其中植食性的占48.2%,肉食性的占30.4%,腐食性的占17.3%,其余则属于尸食性和粪食性等。所谓植食性,就是取食植物的根、茎、叶、花和果。人类所 At present, about 10,000 pests are known to be harmful to crops, most of them insects. Insects are the most abundant, widely distributed, most adaptable and largest group of animals in the world. They are distributed in plants, animals, soil, water and food storage. Due to different living and living conditions, they can be divided into 5 categories: herbivorous, carnivorous, carnivorous, Accounting for 48.2%, carnivorous accounted for 30.4%, 17.3% of the rotten food, the rest belong to the necropsy and fecal food and so on. The so-called phytophagous, that is, eating plants roots, stems, leaves, flowers and fruit. Humanity