Efficiency, intrinsic competition and interspecific host discrimination ofCopidosomadesantisiandTrichogrammaevanescens, two parasitoids ofPhthorimaea operculella

Autor:	Bao-Li Qiu, Nasser S. Mandour, M. F. Mahmoud, Mohamed A.M. Osman
Rok vydání:	2008
Předmět:	food.ingredient biology Host (biology) fungi Trichogramma evanescens Gelechiidae biology.organism_classification Copidosoma Phthorimaea operculella Trichogrammatidae food Encyrtidae Insect Science Botany Agronomy and Crop Science Trichogramma
Zdroj:	Biocontrol Science and Technology. 18:903-912
ISSN:	1360-0478 0958-3157
DOI:	10.1080/09583150802401066
Popis:	Trichogramma evanescens West. (Hymenoptera: Trichogrammatidae) and Copidosoma desantisi Annecke & Mynhardt (Hymenoptera: Encyrtidae) are potential parasitoids of the potato tuber moth (PTM), Phthorimaea operculella (Zeller) (Lepidoptera: Gelechiidae) in Egypt. Discrimination of a parasitized host from an unparasitized host would prevent wasting of time, eggs and reduce competition with conspecifics or heterospecifics. Therefore, we evaluated interspecific host discrimination, multiparasitism and intrinsic competition between the two wasp species. In a choice test, females of T. evanescens showed high interspecific host discrimination only when they were offered 2-day-old C. desantisi parasitized and unparasitized PTM eggs. In contrast, C. desantisi showed high host discrimination and preferred unparasitized eggs to PTM eggs harboring 2-h- or 2-day-old T. evanescens’ eggs. We also evaluated the effect of different introduction sequences on the efficacy of the two wasps. Dissection data indicated t...
Databáze:	OpenAIRE
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