Predation rate in selected coccinellid (Coleoptera) predators on some major Aphidid and Cicadellid (Hemipteran) pests
2011
Inayat, T.P. (University of Agriculture, Faisalabad (Pakistan). Dept. of Zoology and Fisheries) | Rana, S.A. (University of Agriculture, Faisalabad (Pakistan). Dept. of Zoology and Fisheries) | Rana, N. (University of Agriculture, Faisalabad (Pakistan). Dept. of Zoology and Fisheries) | Ruby, T. (University of Agriculture, Faisalabad (Pakistan). Dept. of Zoology and Fisheries) | Javaid, M. (University of Agriculture, Faisalabad (Pakistan). Dept. of Zoology and Fisheries) | Sadiqui, I. (Government Islamia Degree Coll., Faisalabad (Pakistan)) | Abbas, M.N.
Predation rate of adult and larvae of Coccinella septempunctata, Cheilomenes sexmaculata, and Hippodamia variegata on aphids Macrosiphum miscanthi, Schizaphis graminum, Aphis maidis and jassid Empoasca kerri, the major pests in croplands of Punjab was studied in laboratory. The experiments were carried out at 25 degree C plus minus 5 degree C, at relative humidity of 60 plus minus 5 and 12:12 (light: darkness) hours photoperiod. Two experiments were designed. In first experiment, each predator (adult/larvae) was fed a prey species at different densities (30, 40 & 50). In second experiment, all the predators (adult/larvae) were fed different prey species with fixed number (20). The average predation rate ranged from10.6 plus minus 0.71 to 33 plus minus 5.43 aphids and 4.8 plus minus 0.84 to 8.8 plus minus 1.48 jassid/day. Predation rate of each predator species increased with the increase in prey density of each species. Overall larval feeding rate was 2.0 fold greater than those of adults. Adult Hippodamia variegata and Cheilomenes sexmaculata had greater predation rate as compared to C. septempunctata; whereas larval feeding rate was almost same within each prey density. Predators preferred aphids over jassids. Among the aphids, Schizaphis graminum was the preferred species. Adults did not consume jassid in presence of aphid. Findings may be helpful in understanding the role of some coccinellids as natural pest suppressors and their possible use in biological control programmes against aphid/jassid species.
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