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微红绒茧蜂为我国北部地区菜白蝶幼虫的主要寄生蜂,在北京寄生率可高达73.7％。该蜂于10月下旬进入滞育,以预蛹在茧内越冬,翌年4月中旬开始羽化,正值田间第一代菜白蝶幼虫开始发生。在27—19.7℃下,该蜂在13.5—28.8天内完成一个世代。雌蜂主要选择1龄菜青虫寄生,平均产卵80.4粒,成茧率43.5％,雌雄性比为1.3:1。补充营养对雌成虫寿命和繁殖力有很大影响。夏季微红绒茧蜂在27℃定温室中蛹期为6天,冷藏于11℃25天,羽化率仍为93.5％。初越冬茧在定温室中蛹期平均为19.5天,经在不生火屋内存放后移入27℃中的越冬茧,能较快地羽化,移入至羽化所需的时间随存放时间的增长而缩短,存放15天的需18.4天,存放170天的需7.7天。
Reddish Culex pipiens pallens are the main parasitic wasps of the larvae of Cabbage butterfly in the northern part of China. The parasitism rate in Beijing is as high as 73.7%. The bee entered the diapause in late October to pre-pupa in the winter cocoon, began to emerge in mid-April the following year, just the first generation of Cabbage butterfly larvae began to occur. At 27-19.7 ° C, the bee completed one generation in 13.5-28.8 days. Female bees mainly choose 1-year-old cabbage parasites, the average spawning 80.4, cocoon formation rate of 43.5%, male to female ratio of 1.3: 1. Supplemental nutrition has a significant impact on the life and fertility of female adults. In summer, the pupal stage was 6 days in the constant temperature room at 27 ℃, and the pupal stage was still cold at 11 ℃ for 25 days with the emergence rate of 93.5%. The cocoon of early winter cocoon had an average pupal period of 19.5 days in the constant temperature room. The cocoon transferred into the 27 ° C after it was stored in the unheated room could emerge faster, and the time required for emergence into feathering shortened with the increase of storage time, 18 days for 15 days and 7.7 days for 170 days.