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我场果树每年都发生梨二义蚜、苹果疣蚜、桃粉蚜、桔蚜等,引起梨叶纵卷、苹果柑桔叶片变黄,影响果实品质。每年防治蚜虫需要花费大量人力和农药。据1975年和1976年统计,每年普治一次,挑治两次,占用65个劳力,农药费用160元以上,往往还防治不彻底。1976年试用乐果液涂干结果梨树100株,3月中旬涂干,6月份检查,未见蚜虫发生,防治效果100%;而未涂干的,一直到7月份还可见到蚜虫。1977年3月14日开始,我场8,000株果树全用乐果涂干,到7月上旬都未见蚜虫为害,只占用16个劳力,32元药费,基本上控制了蚜虫的发生。
Every year, fruit trees in our field occur pear aphid, apple wart aphid, peach aphid, orange aphid and so on, causing the peel leaf roll, yellow apple leaves, affecting fruit quality. It takes a lot of manpower and pesticides to control aphids every year. According to the statistics of 1975 and 1976, once a year, Przewalski took twice a year, taking 65 labor and spending more than 160 yuan on pesticides, often with inadequate prevention and control. 1976 test results of liquid dimethoate dry pear 100, dry in mid-March, check in June, no aphids occurred, the control effect of 100%; and not coated, until July can also be seen aphids. Starting March 14, 1977, 8,000 fruit trees in our farm were coated with dimethoate. No aphid damage was observed in early July, and only 16 labors and 32 yuan were spent on the control of aphids.