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颈双缘姬蜂对小菜蛾不同日龄蛹有明显的选择性，对０～１天蛹龄的选择性指标，分别为１～２天、２～３天、３～４天的１．７、７．３和１９．１倍；在龄期较低的寄主蛹中，寄生成功羽化出蜂率较高，育出的雌蜂个体较大，生殖力较高，成蜂寿命较长，但未成熟期发育历期、子代性比则不受育蜂寄主蛹龄的影响，雌蜂虫体大小各指标与其生殖力和寿命三者之间相关密切。从０～１天蛹龄中育出的雌蜂，比１～２天和２～３天平均寄生寄主头数，分别高出３．６１、４．５１倍，成蜂寿命分别长１倍以上。
Eupatorium jellyfish on the diamondback moth different days of age pupal obvious selectivity of 0 to 1 days of pupal age selective indicators were 1 to 2 days, 2 to 3 days, 3 to 4 days of 1.7 , 7.3 and 19.1 times; in the lower host pupal pupae, parasitosis succeeded in the emergence of a higher rate of bees, females raised larger individuals, higher fecundity, adult bees have a longer life expectancy, The immature stage of development and the progeny ratio were not affected by the age of the female parent at the age of pupal. The size and size of the female was closely related to their fecundity and life span. The female wasps born from 0 to 1 day old pupal age were 3.61,4.51 times higher than the average numbers of parasitized host heads 1-2 days and 2-3 days, .