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Your Position :Home->Past Journals Catalog->2011年48 No.3

The predation of Orius similis to Frankliniella occidentalis and Aphis craccivora
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Key Words: Orius similis, Frankliniella occidentalis, Aphis craccivora, predation
Abstract:
AbstractOrius similis is an important natural enemy of many small insect pests.Predation of O.similis on two common pests, Frankliniella occidentalis and Aphis craccivora, was studied.The functional responses of 3rd to 5th instars and adults of O.similis to F.occidentalis could be described by Holling Ⅱequations.Both instars and female adults of O.similis displayed higher instantaneous attack rates on F.occidentalis than on A.craccivora, however, adults had a lower instantaneous attack rate on the 2nd instar of F.occidentalis compared to that of A.craccivora.The 5th instar nymph of O.similis had a better ability to control A.craccivora than female adults, however, the reverse was true with respect to F.occidentalis.Predation rates were densitydependent; predation efficiency (E) decreased with increasing O.similes density (P).Regression equations of the predation efficiency of 5th instar O.similes nymphs on 2nd instar larva of F.occidentalis and A.craccivora were E=0.412P-1.623 and E=0.416P-1.639 respectively.5th instar nymphs had a positive preference for 2nd instar larva of F.occidentalis over those of A.craccivora, however, previous experience had a significant influence on prey preference; O.similis prefers to prey on which it has previously fed.
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