Intraguild interactions of the greenhouse whitefly natural enemies, predator Dicyphus hesperus, pathogen Beauveria bassiana and parasitoid Encarsia formosa

Authors: Labbé, Roselyne
Advisor: Brodeur, JacquesCloutier, Conrad
Abstract: In Canada, an increasing diversity of natural enemies, which includes generalist predators, is available in the control of greenhouse pests such as the greenhouse whitefly on tomato crops. Successful whitefly suppression is now achieved through the concurrent use of the specialist parasitoid Encarsia formosa, the native zoophytogphagous predatory bug Dicyphus hesperus and products such as biological insecticide BotaniGard®, an entomopathogenic formulation based on the conidia of fungus Beauveria bassiana strain GHA. In this study, experiments conducted in the laboratory and greenhouse evaluated the impact of interactions among these organisms on non-target organisms. In the laboratory, we identified an important decrease in predation of infected whitefly at late infection stages, but not of parasitized whitefly suggesting that D. hesperus may interfere with parasitoid biological control. In the greenhouse, reduced predation of B. bassiana infected whitefly by D. hesperus may be avoided by applying temporal or spatial separation between these two agents.
Document Type: Mémoire de maîtrise
Issue Date: 2005
Open Access Date: 11 April 2018
Grantor: Université Laval
Collection:Thèses et mémoires

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