Predation of Stethorus parapauperculus on Eotetranychus sexmaculatus
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Key Words：Eotetranychus sexmaculatus, Stethorus parapauperculus, functional responses, interference effect
Abstract： Predatory behavior of the lady beetle Stethorus parapauperculus Pang on Eotetranychus sexmaculatus(Riley) was investigated under laboratory conditions. The mean development time of S. parapauperculus feeding on E. sexmaculatus was 23.6 d. 1st-4th instar S. parapauperculus larvae can prey on 9.5, 14.5, 19.5, 64.2 adult spider mites respectively, while adults can prey on 880.4 spider mites. The functional response of the adult lady beetle to E. sexmaculatus fitted the Holling model Na=1.3843N/(1+0. 0231N), and a χ2 test confirmed that the theoretical value calculated by the fitted Holling disc equation conformed well with observed values. The functional response of adult S. parapauperculus to their own density fitted the Watt model; E=0.4690P-0.5470.