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Idesia (Arica)

On-line version ISSN 0718-3429


LISBOA MEIRA, Ariana; PRATISSOLI, Dirceu; POLANCZYK, Ricardo  and  MADGAN, Leonardo. Selection of Trichogramma sp. (Hymenoptera: Trichogrammatidae) species parasitizing eggs of Anagasta kuehniella (Lepidoptera: Pyralidae). Idesia [online]. 2012, vol.30, n.1, pp.101-108. ISSN 0718-3429.

Trichogramma species are natural egg parasites of various species of Lepidoptera. However, different species of parasitoid prefer different hosts. Therefore, to achieve success in the biological control program using Trichogramma, it is necessary to study the species most related to the alternative host. Four species of Trichogramma were investigated: Trichogramma acacioi Brun, Moraes & Soares, Trichogramma atopovirilia & Platner Oatman, Trichogramma exiguum Pinto & Platner and Trichogramma pretiosum Riley (Hymenoptera: Trichogrammatidae). Three indicators were studied: parasitism within a 24 h period, daily parasitism rate during the adult stage and the fertility life table of the host Anagasta kuehniella (Zeller) (Lepidoptera: Pyralidae). T. acacioi and T. pretiosum showed the highest daily parasitism rate during the adult stage and the greatest effect on the fertility life table, while the species with best performance was T. exiguum. Thus parasitism within 24-h period and host fertility life table were the most efficient systems of selection of species, but with limitations compared to daily adult parasitism rate.

Keywords : alternative host; parasitoid selection; biological control.

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