POTENTIAL ROLE OF WILD CRUCIFERS IN THE PRESERVATION OF DIADEGMA EUCEROPHAGA HORSTMAN (HYMENOPTERA: ICHNEUMONIDAE), A PARASITOID OF THE DIAMONDBACK MOTH, PLUTELLA XYLOSTELLA LINNAEUS (LEPIDOPTERA: PLUTELLIDAE)
AbstractLaboratory andÂ field experiments were conducted to evaluate the potential role ofÂ two species of wild crucifersÂ in the preservation of Diadegma eucerophaga Horstman, a parasitoid ofÂ the diamondback moth, Plutella xylostella Linnaeus. In the laboratory, D. eucerophaga developed quite well on P. xylostella larvae fed on leaves of two species of wild cruciferous plants, Nasturtium heterophyllum BL. and Cardamine hirsuta L. These wild crucifers may serve as food and oviposition sites for P. xylostella. In the field, N. heterophyllum and C.Â hirsutaÂ plantedÂ adjacentÂ toÂ insecticide-treatedÂ cabbageÂ plotsÂ providedÂ refugeÂ forÂ D.Â eucerophaga parasitoids.
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