在自然变温条件下 ,研究了番茄抽提物对小菜蛾成虫的忌避、幼虫的拒食作用及成虫繁殖力的影响。试验表明 :番茄抽提物对小菜蛾成虫具有很强的忌避作用 ;用番茄抽提物处理过的包菜叶饲喂小菜蛾幼虫 ,其拒食率达 53% ;番茄抽提物对小菜蛾成虫产卵也有明显抑制作用 ,产卵量下降 6 0 % ;番茄与包菜间种能明显地抑制小菜蛾种群数量的增长。其种群可下降 50 %以上 The effect of tomato extract on the repellency of adults of the diamondback moth (Plutella xylostella), the antifeeding effect of the larvae, and the fertility of adult adults were studied under natural temperature conditions. The results showed that the tomato extract had a strong repellent effect on adults of Plutella xylostella. The feeding resistance of Plutella xylostella to the diamondback moth larvae fed with tomato extract was 53% Spawning also significantly inhibited the fecundity decreased 60%; between tomato and cabbage can significantly inhibit the population growth of diamondback moth. Its population can be reduced by more than 50%