本省棉区第一代红铃虫发生少,为害经;二代明显上升,为害加重;三代虫量显著激增,严重为害中、上部青铃。如不及时防治,青铃被害率可在90％以上,棉产量损失为20％左右。因此查清红铃虫第三代虫源,搞好测报,及时指导田间药剂防治很有必要。现将1977—1982年在肖山棉区进行系统调查的结果总结如下。 一、试验方法和过程 选有代表性的棉田定300—500株棉花,调 The first generation of pink bollworm cotton area in the province less damage to the damage by the second generation significantly increased harm worse; three significant increase in insect population, serious harm to the upper part of the green bell. If not timely control, Qingling damage rate can be more than 90%, cotton yield loss of about 20%. Therefore, to identify the third generation of pink bollworm insect source, do a good job measuring, timely guidance of field pesticide control is necessary. The results of a systematic survey conducted in the Xiao Shan cotton area from 1977 to 1982 are summarized as follows. First, the test methods and processes Selected representative cotton fields set 300-500 cotton, tune