Biological control of lettuce aphids with the entomopathogenic fungus Verticillium lecanii in greenhouses | [Lutte biologique contre les pucerons de la laitue avec le champignon entomopathogène Verticillium lecanii sous serre]
1999
Fournier, V. ((Université Laval, Sainte Foy (Canada). Centre de Recherche en Horticulture)) | Brodeur, J.
The aim of our research was to identify a pesticide-free treatment to prevent aphid outbreaks in greenhouse lettuce crops. In the laboratory, we first determined the effectiveness of two strains of the hyphomycete fungus Verticillium lecanii, DAOM 198499 and Vertalec(TM), on three lettuce aphid species. Estimated LC50 and aphid net reproductive rate (Ro) indicated that both strains of V. lecanii had a significant impact on each of the aphid species. Under greenhouse conditions, we next assessed the potential of V. lecanii and compared it with three other treatments: BioNeem19, a plant extract Safert's (TM), an insecticidial soap and Malathion (TM), an organophosphate. All treatments significantly reduced aphid populations. Vertalec (TM) was more efficient than strain 198499 in inducing mortality of all three aphid species. The potential of using V. lecanii for the biocontrol of lettuce aphids is discussed in relation to aphid species and crop management
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