东亚小花蝽对MEAM1烟粉虱伪蛹的捕食作用

Predation of Orius sauteri on MEAM1 Bemisia tabaci Pseudopupae

为评估东亚小花蝽(Orius sauteri)对B型(middle east-Asian minor 1,MEAM1)烟粉虱(Bemisia tabaci)的控害潜能,研究了东亚小花蝽成虫对烟粉虱伪蛹的捕食效应。结果表明,在20～32℃条件下东亚小花蝽成虫对烟粉虱伪蛹的捕食功能反应均属于HollingⅡ型。东亚小花蝽成虫的捕食量随猎物密度的升高而增加,猎物密度相同时,以28℃条件下的捕食量最大。东亚小花蝽的寻找效应随着猎物密度的升高而降低,其捕食效率(E)随着捕食者密度(P)的增加而逐渐降低,种内干扰方程为E=0.305 5P-0.681 6,分摊竞争强度(I)方程为I=1.025 0lg P+0.038 0。由此可见,东亚小花蝽对MEAM1烟粉虱的捕食受到猎物密度、捕食者密度和温度的共同影响。

In order to appraise potential capacity of Orius sauteri controlling MEAM1 Bemisia tabaci, predatory effect of a- dult O. sauteri on B. tabaci pseudopupae was studied in laboratory. Results show that the functional responses of adult 0. sauteri preying on B. tabaci pseudopupae could be classified into the type of Holling II in the circumstance of 20 - 32 ℃in temperature. Its catch increased with density of the prey and was the highest at 28 ℃ when the prey density stayed the same, but its searching and predation efficiencies decreased with increasing prey density. Its intraspecific interference fit- ted the equation of E -- 0. 305 5P 0.6816 and the intensity of its scramble competition fitted the equation of I = 1. 025 01g P ＋ 0. 038 0. The above findings listed above indicate that the predation of O. sauteri on B. tabaci pseudopupae is influenced jointly by density of the predators, density of the prey and temperature.