Journal of Biological Control

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Laboratory Investigations were conducted to determine the efficiency of the two exotic parasitoids. Chelonus blackburni Cam. (Hymenoptera : Branconidae) and Copidosoma koehleri Blanch. (Hymenoptera: Encyrtidae) - to parasltlse the potato tuber moth (PTM), Phthorimaea operculella ZeII. (Lepidoptera: Gelechiidae). When exposures of individual species of parasitofd were compared with the combination of both the species, C. blackburni reduced PIM survival with a higher percentage of parasitism. Also, in the combination treatments, C. blackburni significantly reduced the survival of C. koehleri while the latter did not affect the survival of the fomer. None of the combination treatments were superior to individual exposure using C. blackburni with respect to host mortality and overall parasitold survival. Longevity of adults of C. blackburni was markedly reduced in the combination treatments. Also, the number of viable cocoons of C. blackburni was maximum in Individual exposure. Similarly, the longevity of the adults and number of mummies fonned by C. koehleri was reduced in the combination treatments when compared to individual exposure.

Keywords

Phzhorimaea operculella, Chelonus blackburni, Copidosoma koehleri, Exotic Parasitoids, Parasitising Efficiency.
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