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Laboratory biology of the dusky sap beetle carpophilus lugubris and field interaction with the corn earworm heliothis zea in ears of sweet corn



Laboratory biology of the dusky sap beetle carpophilus lugubris and field interaction with the corn earworm heliothis zea in ears of sweet corn



Journal of the Entomological Society of British Columbia 79: 3-8



The developmental rates of the egg, larval and pupal stages of the dusky sap beetle, C. lugubris Murray, reared on artificial diet at 21.degree. C were 4.04, 22.27 and 9.2 days, respectively, a total of 35.5 days. The mean lifetime of adult females was 263 days, or about 110 days longer than previously reported. Its population growth statistics were as follows: intrinsic rate of increase = 0.340 .female./.female. per wk, generation time 12.20 wk, and net reproductive rate = 63.1 .female./.female. per wk. Field studies established that the sap beetles can successfully invade ears of corn throughout the season in the absence of corn earworms, H. zea (Boddie). More sap beetles were found in ears infested with corn earworm than in ears not so infested. Eggs of Geocoris sp. were more abundant in infested ears with corn earworms and sap beetles than in uninfested ears; adults of Orius tristicolor (white) did not display such a preference.

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Accession: 005787534

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