Parasitic capacity of Leptopilina japonica to Drosophila suzukii
Leptopilina japonica is one of the dominant parasitic natural enemies of Drosophila suzukii,displaying great potential for the control of D.suzukii.In this study,we observed the behavioral and developmental characteristics of L.japonica under indoor conditions and investigated its parasitic ability on the 2nd-instar larvae of D.suzukii.The parasitic response,searching effect,and self-density interference effect of L.japonica were analyzed using the Holling Ⅱ type functional response model,searching effect equation and Hassell-Varley model,respectively.The results showed that the parasitic response of L.japonica fitted the Holling Ⅱ type model,and the equation was Na=0.70N/(1+0.03N).The parasitic capacity(a/Th)was 15.78;the parasitic amount increased with increasing host density in a given space,leveling off when the host density reached 25 individuals per jar;the searching effect of the parasitic wasp decreased with increasing host density.The interference models of the parasitoid wasps were E10=0.487 8P 0.8713,E20=0.442 0P-0.676 8,E30=0.346 2P-0.433 7,when host densities were 10,20,30 individuals per jar,respectively.However,searching effect weakened with increasing self-density under same host density.L.japonica shows good parasitic capacity on the 2nd-instar larvae of D.suzukii,however,higher host densities resulted in reduced parasitization capacity of L.japonica,attributed to intraspecific disturbance among the parasitoid individuals as their density increased.
万方数据
维普
