不同蜂卵比条件下松毛虫赤眼蜂对梨小食心虫卵的寄生效果

Parasitic Effect of Trichogramma dendrolimi Density on Grapholita molesta Eggs under Different Parasitic Wasp Egg Ratios

为了明确不同蜂卵比条件下松毛虫赤眼蜂对梨小食心虫卵的寄生效果,采用室内试验方法,研究了不同蜂卵比(1∶5、1∶10、1∶15、1∶20、1∶30)条件下松毛虫赤眼蜂对梨小食心虫卵的寄生率、寻找效应,以及松毛虫赤眼蜂后代羽化率的影响。结果表明:随着单蜂供卵比例的增加,松毛虫赤眼蜂对梨小食心虫卵的寄生率逐渐降低、寻找效应呈先增加后降低的变化,其中,蜂卵比为1∶5时寄生率最高,蜂卵比为1∶20时寻找效应最大,且与其他处理差异均达到了显著水平;松毛虫赤眼蜂后代羽化率逐渐增加,其中蜂卵比为1∶(5~15)时羽化率差异不显著。对不同蜂卵比处理下的寄生率、寻找效应和羽化率进行综合,认为蜂卵比为1∶(10~15)时,松毛虫赤眼蜂对梨小食心虫卵的寻找和寄生效果较好。研究结果为松毛虫赤眼蜂的田间应用提供了理论依据。

In order to clarity the parasitic effect of Trichogramma dendrolimion on Grapholita molesta eggs under different parasitic wasp egg ratios,the parasitism rate,search effect and emergence rate were examined under different parasitic wasp egg ratios(1颐5,1颐10,1颐15,1颐20 and 1颐30)in the laboratory.The results showed that,with the increase of egg feeding ratio,the parasitism rate gradually reduced,while the search effect raised firstly and then reduced.Among which,the parasitism rate was the highest when the parasitic wasp egg ratio was 1颐5,and the search effect was the highest when the parasitic wasp egg ratio was 1颐20,and the difference was significant to other treatments.The offspring emergence rate of T.dendrolimi gradually raised,when the parasitic wasp egg ratio was 1颐(5-15),the difference was not significantly.Based on the comprehensive parasitism rate,search effect and offspring emergence rate,when the parasitic wasp egg ratio was 1颐(10-15),the search effect and parasitism rate were better.The results could provide a theoretical basis for the field application of T.dendrolimi.