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长期以来,防治棉苗蚜虫主要是喷雾或涂茎。喷雾法易造成药液流失,亦不利于保护利用天敌。涂茎法尽管效果好、成本低、避免杀伤天敌,但劳动强度大、工效低,从1984年开始,我区试验用高浓度氧化乐果、久效磷等内吸农药滴心的方法来取代喷雾或涂茎法,1986～1987年两年推广面积达80万亩。具体方法是用普通喷雾器,将喷头用2～8层细布包好,装入药液后压半气,使药液以滴状流出,滴在棉苗的心叶里,通过
For a long time, the main control of cotton seedling aphids is spraying or spraying stems. Spray law easily lead to liquid loss, is not conducive to the protection and use of natural enemies. In spite of its good effect, low cost and avoidance of natural enemies, it is labor-intensive and low in work efficiency. Since 1984, my test in the district has replaced the pesticide droppick with high concentrations of omethoate, monocrotophos, etc. Spray or coating stem method, 1986 to 1987 two years to promote an area of 800000 acres. The specific method is to use an ordinary sprayer, the nozzle with 2 to 8 layers of fine cloth wrapped, into the liquid pressure after the semi-gas, the liquid drops to trickle, drip in the heart of cotton seedlings, through