Variability in the host acceptance of European corn borer, Ostrinia nubilalis Hbn. (Lep., Pyralidae) in strains of the egg parasitoid Trichogramma spp. (Hym., Trichogrammatidae)
1993
Pavlik, J. (Czechoslovak Academy of Sciences, Ceske Budejovice (CSFR). Inst. of Entmology)
The acceptance of the natural host Ostrinia nubilalis was compared in Trichogramma maidis (5 strains), Trichogramma evanescens (2 strains), Trichogramma ostriniae (1 strain) and Trichogramma dendrolimi (1 strain). Significant interspecific differences were detected in the number of parasitized eggs of O. nubilalis. The lowest parasitization activity and reduction in the proportion of parasitizing females were recorded in strains of T. evanescens. Significant intraspecific differences were also recorded among strains of T. maidis. The strain of T. maidis from natural host Mamestra brassicae did not differ in parasitization from other strains of T. maidis from natural host O. nubilalis. Great differences were found in the number of progeny per host egg to both at interspecific and intraspecific level. Comparing studied strains no differences were found in six ratio of female's progeny. The results indicate, that some Trichogramma strains did not lose their acceptance of their natural host and successfully developed in this host despite their being reared on factitious host Ephestia kuehniella for several years. The implication for evaluation of potential Trichogramma strains for inundative control is discussed
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