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棉花伏蚜具有繁殖速度快、发生量大等特点,多呈爆发性,常给生产带来极大危害。1.加强田间调查,抓住用药关键期。在伏蚜发生期,要2天调查1次,当棉株下部叶片出现少量发光蜜点,棉蚜开始向上转移时,即是伏蚜大发生的预兆。当田间点片卷叶株数量在3%~5%时,应立即喷药。2.搞好农业防治。伏蚜的虫源多集中在底部老叶、嫩杈及刺儿菜等杂草上。因此,喷药之前应结合整枝将打下的老叶、嫩杈、杂草等带出田外深埋处理,可有效减
Cotton aphid with reproductive speed, the occurrence of large quantities of other characteristics, mostly explosive, often to produce great harm. 1. Strengthen the field investigation, seize the key period of medication. In the occurrence period of aphids, it takes two days to investigate once. When a few luminescent honey spots appear in the lower leaves of cotton plants, the cotton aphids begin to migrate upwards, which is a sign of large occurrence of aphids. When the field spot film leaf volume in 3% to 5%, should immediately spray. 2 do a good job in agricultural prevention and control. Aphids insects are mostly concentrated in the bottom of the old leaves, tender twigs and spiny vegetables and other weeds. Therefore, the spraying should be combined with pruning will lay the old leaves, tender twigs, weeds and other fields out of the ground with deep treatment, which can effectively reduce