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蚜虫是小麦黄矮病的传毒介体。治蚜防病的时间和次数怎样掌握?1979—1981年在五寨县进行了试验。一、麦蚜、黄矮病的消长规律麦蚜4月下旬至5月初在麦苗上始现,5月上、中旬有翅蚜量上升,下旬为迁飞高峰,蚜量成倍增长。6月上、中旬麦蚜天敌迁入麦田,蚜量下降,黄矮病始出现,下旬进入发病盛期。二、防治时间和次数1981年在五寨试验站试验,小区面积0.1亩,前茬作物莜麦,供试品种京甘127,用乐果加1605兑水1,000倍,亩喷150斤。从试验看出,晋西北春麦区5月10日前后正是小麦三叶末期,当麦田有翅蚜株率达
Aphids are wheat yellow dwarf virus drug-mediated mediators. How to control the time and frequency of aphids disease prevention? 1979-1981 in Wuzhai County conducted a trial. First, the wheat aphids, yellow dwarf disease growth and decline Wheat aphids from late April to early May appeared on the wheat seedlings, in May, the mid-winged aphid amount rise late in the migration peak, aphids doubled. In mid-June, the wheat aphid natural enemies moved into the wheat fields, the amount of aphids decreased, and the emergence of yellow dwarf disease began in the late peak. Second, the prevention and treatment time and frequency In 1981 in Wuzhai test station test, the plot area of 0.1 acres, the former crop 莜 wheat, the test varieties Jingan 127, dimethoate plus 1605 Duishui 1,000 times, mu spray 150 pounds. From the experiment, it can be seen that the spring wheat area in the northwestern part of Shanxi Province is the late stage of wheat clover around May 10, and when the rate of winged aphid in wheat field reaches