Abstract
Greenhouse and field experiments were conducted to evaluate the potential of inoculative releases of the predatory midge,Aphidoletes aphidimyza (Rondani), on aphid populations on vegetables. The predator was collected from wild and cultivated plants in upstate New York and subsequently reared in the laboratory. Midges from the rearings were released, as pupae, into greenhouses and field plots where plants were infested with aphids, predominately the green peach aphid,Myzus persicae (Sulzer).
In a greenhouse with a low aphid density 2 releases ofA. aphidimyza 7 days apart effectively suppressed aphid populations on tomatoes. When midges were released on a 14-day interval into high densities of aphids on tomatoes and peppers in the greenhouse, they significantly reduced the number of aphids and aphidinduced injury, compared to an untreated control.
Two releases ofA. aphidimyza, 21 days apart, effectively controlled green peach aphid on field-grown peppers by maintaining aphid populations at low levels throughout the season compared to the untreated control plots which were heavily colonized by the aphids.
Résumé
Des essais ont été menés en serre et dans les champs afin d'évaluer l'effet de l'introduction du prédateur,Aphidoletes aphidimyza (Rondani) sur des populations aphidiennes infestant des cultures légumières. Des spécimens d'A. aphidimyza furent prélevés sur des plantes sauvages ou cultivées dans l'état de New-York et furent élevés en laboratoire. Les pupes des descendants furent introduites dans des serres et des champs contenant des plantes infestées par des aphides, principalementMyzus persicae (Sulzer).
Deux introductions deA. aphidimyza, à un intervalle de 7 jours, dans une serre ayant une faible densité d'aphides ont complètement supprimé les populations sur tomate. Lorsque les prédateurs étaient introduits à un intervalle de 14 jours dans une serre ayant une forte densité de pucerons sur tomates et poivrons, le nombre d'aphides et l'étendue des dégâts causés ont diminué de façon significative par rapport à un témoin non traité avecA. aphidimyza.
Deux introductions deA. aphidimyza, à 21 jours d'intervalle, dans des champs de poivrons, ont contrôlé efficacementM. persicae en maintenant sa population à un effectif réduit durant toute la saison de culture. Les champs non traités avecA. aphidimyza étaient fortement infestés par les pucerons.
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Meadow, R.H., Kelly, W.C. & Shelton, A.M. Evaluation ofAphidoletes aphidimyza [Dip.: Cecidomyiidae] for control ofMyzus persicae [Hom.: Aphididae] in greenhouse and field experiments in the United States. Entomophaga 30, 385–392 (1985). https://doi.org/10.1007/BF02372344
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DOI: https://doi.org/10.1007/BF02372344