Abstract
The potential ofTrichogramma evanescens Westwood andT. embryophagum Quednau to controlEphestia kuehniella andE. elutella was evaluated under laboratory conditions. BothTrichogramma species parasitised eggs of the twoEphestia spp. in bulk wheat at 1, 2 and 5 cm depth. The release ofT. evanescens was more effective than that ofT. embryophagum resulting in higher rates of parasitism, predation and parasitoid induced mortality. At 17‡C and 26‡C, the mortality ofEphestia due to the release ofT. evanescens was 67, 78% and ofT. embryophagum 27 and 38%, respectively. The difference in host finding efficiency between the two species was large, at 5 cm depth and 26‡C,T. evanescens parasitised about four times more host eggs compared to T.embryophagum.
Résumé
La capacité deT. evanescens et deT. embryophagum à contrÔlerEphestia spp. a été évaluée en conditions de laboratoire. Les deux espèces deTrichogramma arrivent à parasiter les ∄ufs d’Ephestiakuehniella et d’E.elutella dans le blé stocké, indifféremment à une profondeur de 1, 2 et 5 cm. L’espèceT. evanescens donne un meilleur résultat queT. embryophagum, avec un taux de parasitisme et une mortalité &Ephestia plus importants. A 17 ‡C et 26 ‡C, on a observé un taux de parasitisme avecT. evanescens de 67 % et 77,8 % respectivement, et seulement de 27 % et 38 % avecT. embryophagum, respectivement. On a montré que le choix des espèces les plus performantes parmi celles qui sont disponibles donne une perspective favorable pour l’amélioration du contrÔle des lépidoptères nuisibles aux produits stockés.
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Schöller, M., Hassan, S.A. & Reichmuth, C. Efficacy Assessment Of Trichogramma Evanescens And T. Embryophagum ( Bdhym.: Trichogrammatidae), For Control Of Stored Products Moth Pests In Bulk Wheat. Entomophaga 41, 125–132 (1996). https://doi.org/10.1007/BF02893299
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DOI: https://doi.org/10.1007/BF02893299