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Eggs of stored-product lepidoptera as hosts forTrichogramma evanescens [Hym.: Trichogrammatidae]

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Abstract

Eggs were collected fromAnagasta küehniella (Zeller),Ephestia cautella (Walker),E. elutella, (Hübner),E. figulilella (Gregson), andPlodia interpunctella (Hübner) and exposed to adults of the egg parasite,Trichogramma evanescens Westwood, in a free choice experiment. Host eggs were ranked by decreasing percentages of parasitization as follows:E. elutella > E. cautella > E. figulilella > A. küehniella > P. interpunctella. Differences in percent parasitization were not significant betweenEphestia spp., butA. küehniella andP. interpunctella were parasitized significantly less often. Average percentage egg hatch after exposure toTrichogramma ranged from 5.0 to 9.3%, except forPlodia where it averaged 33.3%. It appears that inundative releases ofTrichogramma into commodity storages could play an important role in suppression of stored-product moth populations.

Résumé

Des œufs deAnagasta kuehniella (Zeller),Ephestia cautella (Walker),E. elutella (Hübner),E. figulilella (Gregson) etPlodia interpuntella (Hübner) ont été présentés à des adultes deTrichogramma evanescens Westwood dans un dispositif à libre choix. Les œufs-hôtes ont été classés selon le pourcentage décroissant de parasitisme comme suit:E. elutella > E. cautella > E. figuliella > A. kuehniella > P. interpunctella. Les différences de pourcentages de parasitisme ne furent pas significatives entre les espèces d'Ephestia maisA. kuehniella etP. interpunctella ont été parasités nettement moins souvent. Le pourcentage moyen d'éclosion après l'exposition auxTrichogramma ont varié de 5 à 9,3%, sauf dans le cas dePlodia, où il fut de 33,3%.

Des lachers inondatifs deTrichogramma dans les stocks de denrées peuvent avoir un rôle important dans la suppression des populations des lépidoptères nuisibles.

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  1. Stored-Product Insects Research and Development Laboratory, Agricultural Research Service, USDA, Savannah, Georgia, USA

    J. H. Brower

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Brower, J.H. Eggs of stored-product lepidoptera as hosts forTrichogramma evanescens [Hym.: Trichogrammatidae]. Entomophaga 28, 355–361 (1983). https://doi.org/10.1007/BF02372188

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