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Larval development, aphid consumption and oviposition for five imported coccinellids at constant temperature on Russian wheat aphids and greenbugs



Larval development, aphid consumption and oviposition for five imported coccinellids at constant temperature on Russian wheat aphids and greenbugs



Southwestern Entomologist 17(3): 233-243



The effects of two aphid prey species on larval development, aphid consumption, and oviposition for eleven exotic species or strains of imported coccinellid beetles were studied at 20 degree C constant temperature. Complete development was observed with all species and strains regardless of the prey species. The predator species with the most rapid larval development and greatest daily consumption of Russian wheat aphid, Diuraphis noxia (Mordvilko), were Coccinella septempunctata L. at 13.8 day and 43.1 aphids per day; a Hippodamia variegata (Goeze) strain from Chile at 11.6 days and 28.7 aphids; and a Propyleae quatuordecimpunctata (L.) strain from the Ukraine at 10.1 days and 25.6 aphids. When greenbugs, Schizaphis graminum (Rondani), were utilized as a prey species, the most efficacous predator species were Hippodamia tredecimpunctata (L.) strains from Kirghizia at 12.6 days and 26.3 aphids and Moldavia at 12.0 days and 25.8 aphids, a strain of H. variegata from Moldavia at 12.9 days and 31.9 aphids, and a Moldavian strain of P. quatuordecimpunctata at 10.4 days and 21.1 aphids. Oviposition rates were not consistent with regard to prey. Most species produced greater numbers of eggs when fed green bugs, but a greater percent of eggs enclosed when the parent female was fed Russian wheat aphids.

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