Influence of host plants on specialist/generalist aphids and on the development of Adalia bipunctata (Coleoptera: Coccinellidae)
2000
Francis, F. | Haubruge, E. | Gaspar, C. (Agricultural Univ., Gembloux (Belgium). Unit of General and Applied Zoology)
The aim of this work was to determine the impact of allelochemicals (glucosinolates/isothiocyanates) from Brassicaceae (Brassica napus and Sinapis alba) at two trophic levels in relation to biological control efficacy. The impact of these plants on aphid Myzus persicae and Brevicoryne brassicae and ladybird Adalia bipunctata biology can be assessed by observation of several developmental parameters. Sub-lethal toxicity can be measured through the reproductive parameters. While both specialist and generalist aphids were positively influenced by Brassicaceae species, mixed effects are recorded in ladybird performances following the aphid species/host plant combinations. Significant differences appeared according to aphid host plant and aphid species. The allelochemical presence in plants must be taken into account in programs of integrated pest management due to their direct influence on biological control agents.
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