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病虫害是影响农业增产的大敌。1973年小麦病毒病大发生,发病面积1000多万亩,损失粮食2亿多斤;小麦黑穗病1975年普查发病210万亩,损失粮食1000多万斤;地下害虫一般年份发生1200多万亩,估计损失粮食1亿5千多万斤;麦田杂草野燕麦近几年发展很快,关中地区发生150多万亩,损失粮食8000多万斤。据不完全统计:每年因病虫危害,全省夏粮损失达4～5亿斤。这些病虫的发生、危
Pests and diseases are the enemy that affect the agricultural production. In 1973, the occurrence of wheat virus disease occurred, the incidence of more than 10 million mu area, the loss of food 200 million kilograms; wheat smut in 1975 the census 210 million mu, loss of food more than 1000 kilograms; underground pests occurred in more than 1200 mu It is estimated that more than 150 million kilograms of grain will be lost. Wild weeds of weed field have developed rapidly in recent years. Over 150 million mu of land have been damaged in the Guanzhong area and more than 8,000 kilograms of grain have been lost. According to incomplete statistics, pests and diseases are harmed each year, the province’s summer grain losses amount to 4 to 5 billion jin. The occurrence of these pests, danger