Abstract: In order to appraise potential capacity of Orius sauteri controlling MEAM1 Bemisia tabaci, predatory effect of adult O. sauteri on B. tabaci pseudopupae was studied in the laboratory. Results show that the functional responses of adult O. 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 fitted the equation of E =0.3055P^-0.6816 and the intensity of its scramble competition fitted the equation of I=1.0250lgP+0.0380. 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.

Key words: Orius sauteri, MEAM1 Bemisia tabaci, predation, functional response, interference response