防治农作物病虫害是确保农业高产优质的重要措施之一。采用化学农药防治作物病虫害,有许多弱点和弊端。一是污染环境,危害人畜健康;二是在杀灭病虫害的同时也杀死了有益生物,破坏了生态平衡;三是病虫害产生了抗药性,农药用量越来越大。因此,在病虫防治上,要从经济、安全、有效地 Prevention and control of crop pests and diseases is one of the important measures to ensure high yield and quality of agriculture. The use of chemical pesticides to control crop pests and diseases has many weaknesses and drawbacks. First, it pollutes the environment and endangers the health of people and livestock. Second, it also kills useful organisms while killing pests and damages the ecological balance. Third, pests and diseases develop resistance and the dosage of pesticides is getting larger and larger. Therefore, pest control should be economically, safely and effectively