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防治农作物病虫害,是实现农业发展纲要40条和贯彻农业八字宪法,保证农业丰收的一项重要措施。根据记载,我国过去历年约有50—60％的农作物栽培面积上,经常遭受不同程度的病虫为害。1950年全国小麦锈病猖獗,减产120亿斤,占当年小麦产量的三分之一。1952年全国蝗虫发生3770余万亩,棉蚜发生4300余万亩,高粱蚜虫发生1500余万亩,麦蚜、麦蜘蛛发生3600余万亩。病虫灾害的发生,毫无疑问,会给我们农业生产造成巨大的损失。根据粗略的估计,在全国范围内,由于病虫为害,每年粮食大约减产10％,棉花大约减产20％,果品大约
Prevention and control of pests and diseases of crops is an important measure to realize the 40 Outline of Agricultural Development and implement the Character Eight Character Constitution to ensure the harvest of agriculture. According to records, about 50-60% of the crop area under cultivation in our country has suffered from pest and disease to varying degrees. In 1950, wheat rust was rampant in the country, cutting 12 billion kilograms of wheat, accounting for one third of that year’s wheat output. In 1952, more than 3770 mu of locusts occurred in the country, with more than 4300 mu of cotton aphids and more than 1,500,000 mu of sorghum aphids. There were over 3600 mu of wheat aphids and wheat spiders. The occurrence of pests and diseases does undoubtedly cause huge losses to our agricultural production. According to a rough estimate, in the whole country, due to pests and diseases, the annual grain output is reduced by about 10%, cotton is reduced by about 20%, fruit is about