瓢虫是棉田捕食性天敌中的主要优势种群。洞庭湖棉区棉田的瓢虫种类超过20种,其中龟纹瓢虫是其优势种,占整个瓢虫种群的67.8%。南县在洞庭湖区具有典型代表性,研究南县棉田瓢虫发生特点,对研究洞庭湖棉区瓢虫的发生及利用有重要的参考意义。1发生规律及习性1.1年消长规律龟纹瓢 Ladybugs are predominant predators in cotton predators. There are more than 20 kinds of ladybugs in the cotton fields of Dongting Lake cotton area, of which the ladybugs are the dominant species, accounting for 67.8% of the ladybug population. South County in the typical representative of the Dongting Lake area, cotton field in southern counties ladybug occurrence characteristics, the study of the occurrence and utilization of ladybugs Dongting Lake cotton area has important reference value. 1 rules and habits 1.1 years growth and decline rules turtle scoop