一、棉蚜为害的程度山东省惠民棉区,五一年棉蚜发生异常严重,其为害程度,为以前所罕见。根据调查以及治蚜不治蚜的示范所得结果来看:治蚜比不治蚜的棉田,平均每亩增收籽棉56%,且增收霜前花达127%。这就充分地说明了治蚜不仅能提高单位面积产量,且能够促进棉花的早熟。现在把防蚜工作中的几点经验,写在下 First, the extent of damage by cotton aphid Huimin cotton area in Shandong Province, 51 cotton aphids occurred exceptionally serious, its degree of harm, as previously rare. According to the survey and the demonstration of aphid treatment of aphids not treated: the aphids treated 56% more seed cotton per acre than the aphid-free aphids, and increased the yield by 127%. This fully shows that the treatment of aphids can not only improve the yield per unit area, and can promote cotton precocity. Now some experience in the prevention of aphids, written in the next