防治农业害虫是保证农作物高产稳产的一项重要措施,病虫害几乎可以使作物应该得到的产量减少三分之一。农业害虫的猖厥,是多种环境因子综合影响的结果,但其中必有一个主导因子。主导因子并不固定,常随时间、地点、条件而转移,甚至同一种害虫的同一虫期, Prevention and control of agricultural pests is an important measure to ensure a high and stable crop yield. Pests and diseases can reduce the yield of crops by almost one third. The aggravation of agricultural pests is the result of a combination of environmental factors, but there must be a dominant factor. The dominant factor is not fixed, often with the transfer of time, place, conditions, and even the same insect pest insects,