Abstract
Aspects of the microhabitat distributions of the gypsy moth,Porthetria dispar (L.) (Lepidoptera: Lymantriidae), and some of its parasitoids were investigated in the field by means of sticky panels and gypsy moth egg masses exposed at different heights in trees, by egg masses exposed within forested and cleared areas, and by gypsy moth pupal collections from different heights in trees.Ooencyrtus kuwanai (Howard)(Hymenoptera: Encyrtidae), Apanteles melanoscelus Ratzeburg (Hymenoptera: Braconidae), and gypsy moths were caught most frequently on stickly panels placed in upper portions of trees. In contrast,Apanteles laeviceps Ashmead, a parasitoid of cutworms, was most often caught near the forest floor.O. kuwanai attacked equally egg masses exposed at different heights in trees, but parasitized those in a clearing less often than those within the forest prosper.Brachymeria intermedia (Nees) (Hymenoptera: Chalcididae) emerged mostly from pupae collected near the tops of trees and not at all from those collected below 5 m. The results are discussed as they relate to field sampling procedures, behavioral activities of gypsy moth and parasitoid adults, and integrated control possibilities for the gypsy moth.
Résumé
La distribution en microhabitats dePorthetria dispar L. et de certains de ses parasites a été étudiée dans la nature au moyen de panneaux englués et de pontes du papillon exposées à différentes hauteurs dans les arbres, au moyen de pontes exposées dans des parties boisées et dans des clairières ainsi que par la récolte des chrysalides à différentes hauteurs dans les arbres.Ooencyrtus kuwanai (Howard)(Hymenoptera: Encyrtidae), Apanteles melanoscelus Ratzeburg (Hymenoptera: Braconidae) et les papillons dePorthetria furent capturés plus fréquemment par les panneaux englués placés dans les parties supérieures des arbres. Au contraireApanteles laeviceps Ashmead, parasite de Noctuelles, fut capturé plus souvent près du sol.O. kuwanai s’attaque d’une façon égale aux pontes placées à différents niveaux dans les arbres, mais il parasite moins souvent celles qui se trouvent en clairière que les pontes en forêt.Brachymeria intermedia Nees (Hymenoptera: Chalcididae) sort surtout des chrysalides récoltées près du sommet des arbres et pas du tout de celles qui sont à moins de 5 mètres. Les résultats sont discutés en rapport avec les méthodes d’échantillonnage dans la nature, le comportement du Bombyx disparate et des parasites, et les possibilités de lutte intégrée contre ce Lépidoptère.
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Weseloh, R.M. Spatial distribution of the gypsy moth [Lepidoptera: Lymantriidae] and some of its parasitoids within a forest environment. Entomophaga 17, 339–351 (1972). https://doi.org/10.1007/BF02371186
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DOI: https://doi.org/10.1007/BF02371186