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种过地的人都深切知道,虫害是农业生产中的一个大敌。据估计,在自然界中,大约有一百五十万种昆虫,其中多数是属于危害农林牧业的害虫。它们的破坏性很大:有的啃食农作物的根;有的蚕食农作物的嫩枝、绿叶;有的钻进作物茎秆,吸取作物的营养汁液;有的传染病害;有的咬坏果实……,给人类生产带来不少的灾难。根据联合国粮食组织估计,全世界粮食产量每年因病虫害的损失有10—15％,棉花的损失达20—25％。
Those who have been living through it know very well that pest is a great enemy in agricultural production. It is estimated that there are about 1.5 million insects in nature, the majority of which are pests that endanger agriculture, forestry and animal husbandry. They are very destructive: some eat the roots of crops; some erode the crops of young shoots, green leaves; some drill crops stems, absorb the nutrient juice of crops; some infectious diseases; some bite bad fruit ... ..., bring a lot of disasters to human production. According to estimates by the Food and Agriculture Organization of the United Nations, food production in the world accounts for 10-15% of annual pest losses and 20-25% losses of cotton.