不同防控措施对小菜蛾的防治效果

[目的]探讨小菜蛾的综合防治效果。[方法]测定了3种单项防治技术(菜农化学自防、性诱区和化防)和1个综合防治技术(性诱+化防)对甘蓝种小菜蛾的防治效果。[结果]不同处理区甘蓝上的小菜蛾幼虫发生量为:综防区≈化防区﹤自防区﹤性诱区﹤不妨区。不防区的捕食性天敌最多,分别在11月2日、11月9日达到高峰(1.16和1.22头/株);自防区的捕食性天敌数量始终处于较低水平,在0.04~0.18头/株。整体上,化防区和综防区的天敌数量相似,但高于自防区,低于性诱区和不防区。综防区和化防区的一级甘蓝比例均比自防区高,分别为71.6%和66.8%。综防区的投入收益比在各处理中最高(1∶7.84)。[结论]该研究结果为小菜蛾的有效防治提供了理论依据。

Control Effect of Different Control Measures on the Diamondback Moth(Plutella xylostella)

[Objective]The aim was to study the effect of integrated control techniques to diamondback moth,Plutella xylostella.[Method]The effects of three kinds of single control techniques(chemical control by peasants themselves,sex pheromone and chemical control)and one inte-grated control technology(combination of sex pheromone and chemical control)were determined and compared.[Result]The larvae of P.xylos-tella occurrence in different treatments were different.The best was integrated control and chemical control,followed by chemical control by peas-ants themselves, sex pheromone and uncontrolled zone.The number of predators in uncontrolled zone reached peaks in November 2nd and 9th, 1.16 per plant and 1.22 per plant,respectively.The number of predators in chemical control by peasants zone kept at a relatively low level,be-tween 0.04 to 0.18 per plant.On the whole,the number of natural enemies in chemical control and integrated control area were similar,but they were higher than that of chemical control by peasants,and were lower than sex pheromone and uncontrolled zone.The cabbage quality of both in-tegrated control and chemical control area were better than chemical control by peasants with first level proportion of 71.6%and 66.8%,respec-tively.The investment income ratio of integrated control area was the highest(1:7.84).[Conclusion]The results provide reference for the control of Plutella xylostella.