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据美刊《植物病害》1980年第1期报道,1979年8月在华盛顿举行的第九届国际植物保护会议上,美国密西根州立大学试验站站长S.wittwer博士在讲话中指出:主要食用作物受各种病、虫、杂草和鸟兽害等危害造成的田间损失极大,约占35％。害虫对大多数农作物造成的损失居于首位。Wittwer博士说,化学农药在植物保护中起主要
According to the American Journal of Plant Diseases, No. 1, 1980, at the Ninth International Plant Protection Conference held in Washington in August 1979, Dr. S. Wittwer, director of the Experimental Station of the State University of Michigan, pointed out in his speech: The major Food crops by a variety of diseases, insects, weeds and other animal hazards caused by the great field losses, accounting for about 35%. Pests cause the most damage to most crops. Dr. Wittwer said chemical pesticides play a major role in plant protection