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依靠改良作物品种和改革耕作制度来提高粮食产量,人类已取得较大成就,在现阶段要有新的突破,难度越来越大。快捷见效的办法就是用农药进行植物保护和用化肥为作物提供养分,以确保农业增产增收。目前,我国通过对病、虫、草害的防治,每年可挽回粮食损失150亿千克,但仍有100至150亿千克的农作物受损于病虫草等危害。在当今农业生产期内,因病虫草的危害造成的损失至少占总产量的1/3。世界上各种作物受病虫草害的损失:水稻45%,小麦24%,玉米35%,棉花34%,蔬菜23%。由于使用农药的化学防治具有其他植保方法不可比拟的优点,因此它是现阶段植保工作中极其重
Relying on the improvement of crop varieties and the reform of the farming system to increase grain output, mankind has made great achievements and it is more and more difficult to make new breakthroughs at this stage. The quick and effective solution is to use plant protection of pesticides and fertilizers to provide crops with nutrients to ensure that agricultural production increases. At present, China can save 15 billion kilograms of grain loss every year through the prevention and control of diseases, pests and weeds. However, 10 to 15 billion kilograms of crops are still harmed by pests and diseases. In today’s agricultural production period, losses due to the harm caused by pests and diseases account for at least 1/3 of the total output. The world’s crop loss from pests and diseases: 45% of rice, 24% of wheat, 35% of corn, 34% of cotton, 23% of vegetables. As the chemical control of pesticides has the incomparable merits of other phytosanitary methods, it is extremely heavy at this stage of plant protection