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甘藍夜蛾成虫需要取食糖类物质作为补充营养后,才能进行正常的生殖活动。成虫寿命一般8～10天,产卵期約4～7天。雌雄蛾均在夜晚一定时间内进行飞翔、取食、交配、产卵等活动。本试验观察到雌蛾产卵量一般为800～1500粒,最高达2822粒。卵的孵化率超过90%。雌雄蛾均有多次交配现象。雌蛾经人为地与雄蛾完全隔离后,能产下不受精的卵,产卵量低,卵粒不孵化。成虫取食糖类物质,比以清水或非糖类物质作为补充营养产卵高3～5倍。田间观察到成虫在多种蜜源植物上取食。
Adult cabbage budworm need to take sugar as a supplementary nutrition, in order to carry out normal reproductive activities. Adult life expectancy is generally 8 to 10 days, spawning period of about 4 to 7 days. Both male and female moths fly, feed, mate and spawn at certain times during the night. In this experiment, the fecundity of female moths was generally found to be 800-1,500 grains, up to 2822 grains. Egg hatching rate is over 90%. Male and female moths have many mating phenomenon. Female moths are completely isolated from male moths to produce unfertilized eggs with low fecundity and no eggs to hatch. Adults eat sugars, than water or non-carbohydrates as nutritional supplements 3 to 5 times higher egg production. The adults observed feeding on a variety of nectar plants.