番茄褪绿病毒对刀角瓢虫捕食烟粉虱的影响

Predation effect of Serangium japonicum on Bemisia tabaci affected by Tomato chlorosis virus

在实验室条件下研究了不同温度下刀角瓢虫Serangium japonicum对健康和感染番茄褪绿病毒(Tomato chlorosis virus,ToCV)番茄上的烟粉虱Bemisia tabaci的捕食效果。结果表明,无论在健康番茄还是感染ToCV番茄上,刀角瓢虫均可以取食烟粉虱的卵和若虫,对卵的捕食量最大,且对烟粉虱卵的功能反应都属于Holling II型反应,方程式分别为N_(A)=0.9650N/1+0.0007N和N_(A)=0.9866N/1+0.0006N。温度可以影响功能反应的参数,在30℃时刀角瓢虫对健康番茄上的烟粉虱的控制作用最好,在35℃时刀角瓢虫对感染ToCV番茄上的烟粉虱控制效果最好。刀角瓢虫偏好感染ToCV的番茄植株,对健康番茄偏好性较弱。刀角瓢虫对感染ToCV番茄上的烟粉虱具有良好的捕食效果,可为烟粉虱的生物防治提供合理依据。

The predatory ability of Serangium japonicum on Bemisia tabaci feeding on uninfected tomato plants and tomato chlorosis virus(ToCV)-infected tomato plants were evaluated in the laboratory.The results showed that on uninfected and ToCV-infected tomato plants,S.japonicum could prey on eggs and nymphs of B.tabaci,and showed the largest prey on eggs,and the functional response of female adult S.japonicum on B.tabaci eggs were Holling II type.The equations are N_(A)=0.9650N/1+0.0007N and N_(A)=0.9866N/1+0.0006N,respectively.Temperature could affect the parameters of functional response,and the control effect of S.japonicum on B.tabaci were best at 30℃on uninfected tomato plants,and at 35℃on ToCV-infected tomato plants.S.japonicum preferred ToCV-infected tomato plants.The results showed that the S.japonicum showed a good predation effect on B.tabaci which was fed on ToCV-infected tomato plants,which could provide a reasonable basis for biological control of B.tabaci.