Utilization Efficiency and Functional Response of Orius similis Zheng (Hemiptera:Anthocoridae) to Different Preys Effect of different preys on the predation and prey preference of Orius similis Comparison of the effect of two prey species on the population growth of Orius similis Zheng and the implications for the control of Tetranychus urticae Koch Biological control efficiency of Orius similis Zheng (Hemiptera:Anthocoridae) on Frankliniella occidentalis (Pergande) under different spatial and caged conditions