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按规定,麦田粘虫每亩达到6,000条即为防治对象田;2—3龄定为防治适期。这样带来防治面积过大,施药次数多,施药时间偏早,造成大量天敌被杀伤,不利于麦田生态平衡。1976年以来我们对粘虫的危害习性和天敌作用进行了观察和研究。发现在麦田里麦类和杂草并存的情况下,粘虫危害先杂草后麦类,到杂草枯黄后才转株到麦类植株上去。在麦类植株上危害先下部后上部、先叶片后麦
According to regulations, wheat field armyworm reached 6,000 per acre that is the object of prevention and control of the field; 2-3 age set as control period. This brought the prevention and treatment area is too large, spraying times, spraying time is too early, resulting in a large number of natural enemies were killed, is not conducive to ecological balance in wheat fields. Since 1976, we have observed and studied the harmful habits of Mythimna separata and their natural enemies. Found in the wheat fields in the coexistence of wheat and weeds, armyworms endanger the first weed wheat, to weeds yellow after the transfer to wheat plants up. Hazard in the wheat plant on the lower part of the first lower after the first leaves of wheat