The genus Orius is a group of general predators and consumes a variety of pests including mites, thrips, aphids, eggs and young larvae of moths and other small, soft鄄bodied insects. It is an important biological control agent and plays an important role in controlling many pests. Researches on the effect of different preys on the predation and prey preference of Orius can provide basis for effective use of the agent in biological control. The predation and preference of newly hatched nymph, fifth instar nymph, female adult of O. similis to 3 species of preys, i. e. , (Frankliniella occidentalis, Aphis craccivora, Tetranychus urticae and their combinations) , were studied. The results showed that 1 st instar nymph of the predator, acclimated by feeding different preys, had no significant difference on predation capacity and preference to the prey. Comparison of C i with null hypothesis showed that the preference of 1 st instar nymph of the predator to F. occidentalis was positive under 4 prey treatments with no preference to A. craccivora. There was no preference to T. urticae when feeding on T. urticae, while the preference to T. urticae was negative on other treatments. Fifth instar nymph of the predator, acclimated by feeding different preys, had a significant difference in predation capacity and preference to the prey, significantly increasing the predation to prior feed. For example, the preference to F. occidentalis was biggest with the value of 0. 2580, when O. similis had experienced feeding on F. occidentalis. The predatory capacity and preference to
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