The effects of temperature and host density on the development and survival of Copidosoma koehleri |
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Authors: | P A Horne and J A Horne |
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Institution: | (1) Department of Agriculture and Rural Affairs, Plant Research Institute, Swan St., 3121 Burnley, Victoria, Australia |
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Abstract: | Developmental rates for Copidosoma koehleri Blanchard (Hymenoptera: Encyrtidae) and its host, Phthorimaea operculella (Zeller), were determined at 10, 15, 23, 27, 29, 32, 34 and 35°C from host egg to adult. The developmental rates determined for both species showed good fit to mathematical models of insect development. At 15°C mean emergence of adult C. koehleri was 15 days after P. operculella adults emerged. At 29°C mean emergence of C. koehleri was only 5 days after that of P. operculella. P. operculella developed at 35°C, but parasitized larvae, and therefore C. koehleri, did not tolerate temperatures above 32°C. In the presence of C. koehleri, host survival was low (3%) at low host egg densities, but greater (20%) at higher host densities. Parasitized larvae of P. operculella were less able to compete for food resources, as measured by adult emergence. |
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Keywords: | Copidosoma koehleri Phthorimaea operculella developmental rates parasitoid potato moth |
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