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Interspecific host discrimination and within-host competition between Encarsia formosa and E. pergandiella (Hymenoptera: Aphelinidae), two endoparasitoids of whiteflies (Hemiptera: Aleyrodidae)

Published online by Cambridge University Press:  09 March 2007

P.A. Pedata ,
M. Giorgini  and
E. Guerrieri
P.A. Pedata*
Affiliation:
Istituto per la Protezione delle Piante (IPP), CNR, Sezione di Portici, via Università 133, 80055 Portici, Napoli, Italy
M. Giorgini
Affiliation:
Istituto per la Protezione delle Piante (IPP), CNR, Sezione di Portici, via Università 133, 80055 Portici, Napoli, Italy
E. Guerrieri
Affiliation:
Istituto per la Protezione delle Piante (IPP), CNR, Sezione di Portici, via Università 133, 80055 Portici, Napoli, Italy
*
*Fax: +39 081 7758122 E-mail: pedata@unina.it
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Abstract

Interspecific host discrimination and within-host competition between Encarsia formosa Gahan and Encarsia pergandiella (Howard), two endoparasitoids of whiteflies, were studied under laboratory conditions. Interspecific host discrimination was studied at two time intervals (0 h and 72 h after the first species had oviposited). Parasitized and unparasitized Trialeurodes vaporariorum (Westwood) hosts were accepted for oviposition at the same rate by the two parasitoid species. Host type did not affect the handling time of the two parasitoids. The outcome of within-host competition was investigated after females of the two species parasitized the hosts at various time intervals. In four treatments, E. pergandiella was allowed to oviposit 0, 24, 48 and 72 h after E. formosa while in the other two, E. formosa was allowed to oviposit 0 and 72 h after E. pergandiella. In four of these treatments: E. formosa following E. pergandiella at 0 and 72 h, and E. pergandiella following E. formosa at 0 and 24 h, E. pergandiella prevailed. In the host discrimination experiment (72 h interval), 20% of E. pergandiella eggs were killed by E. formosa females. Interspecific ovicide was also observed in the within-host competition experiment, in which 6% of 72-h-old E. pergandiella eggs were killed by E. formosa females.

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Research Article
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Bulletin of Entomological Research , Volume 92 , Issue 6 , December 2002 , pp. 521 - 528
Copyright
Copyright © Cambridge University Press 2002

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