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以广州、深圳种植的几种主要十字花科蔬菜，研究了小菜蛾对寄主的选择性．室内试验和田间调查结果基本一致：小菜蛾对芥菜、菜心的嗜好性最大，对萝卜、白菜次之，对芥蓝、花椰菜最差．根据小菜蛾喜爱在芥菜上产卵这一特性，进行了芥菜与芥蓝套种诱集防治小菜蛾的田间试验．结果表明，所有套种田中芥蓝上的小菜蛾卵数量都显著低于单种田（Ｐ＜０．０５），在芥蓝生长后期，单种田芥蓝中卵数量高出套种田近１０倍，芥菜中卵和幼虫数量是芥蓝中的好几十倍．说明用芥菜这类对小菜蛾产卵引诱性较强的作物与甘蓝类蔬菜套种可以用来诱集防治小菜蛾对后者的为害．
Several major cruciferous vegetables planted in Guangzhou and Shenzhen were used to study the host selectivity to diamondback moth. Laboratory tests and field survey results are basically the same: Plutella xylostella, cabbage heart the greatest preference for radish, cabbage, followed by kale, cauliflower worst. According to the characteristic that diamondback moth likes to spawn on mustard, the field experiment on the control of Plutella xylostella with mustard and kale was conducted. The results showed that the number of eggs of diamondback moth (Plutella xylostella) in Chinese cabbage was significantly lower than that in monoculture (P <0.05). In the later stage of Chinese kale production, The number of eggs and larvae are several times in Chinese kale. This indicates that the use of mustard, which is particularly attractive for oviposition of diamondback moth (Plutella xylostella) and cabbage (Brassica campestris), can be used to trap and control the infestation of Plutella xylostella to the latter.