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我省广大棉区自1976年开展棉虫综合防治以来,由于较合理地使用化学农药及采取保护和利用自然天敌等措施,使天敌数量逐渐增多,棉田生态平衡逐渐恢复。根据最近几年我们在武昌、汉阳、沔阳等县棉田调查,仅棉蚜的天敌就多达45种以上,其中以蚜茧蜂的自然控制作用最为显著。目前在我省江汉棉区已发现两种蚜茧蜂,印度三叉蚜茧蜂和日本柄瘤蚜茧蜂。前者的发生量最大,是控制棉蚜的优势种群。现将两种蚜茧蜂的形态特征,生物学特性以及在棉田的发生规律分述于下:
Since the implementation of integrated control of cotton and insect pests in our province since 1976, due to the rational use of chemical pesticides and the protection and utilization of natural enemies, the number of natural enemies gradually increased and the ecological balance of cotton fields gradually recovered. According to the survey of cotton fields in Wuchang, Hanyang and Xingyang counties in recent years, as many as 45 or more natural enemies of cotton aphids were found, among which the natural control effect of aphid was the most significant. At present, Jianghan cotton area in our province have found two kinds of aphid Braconian bee, India trigeminal aphid Braconidae and Japan pinnate aphid Braconidae. The former occurred the largest amount, is the dominant population control cotton aphid. Now the morphological characteristics of two kinds of Aphidius bee, biological characteristics and the occurrence of the law in the cotton are described below: