Larvicidal efficacy of different insecticides incorporated in the artificial diet on grape moths. 1. Tests on grape berry moth Eupoecilia ambiguella and comparison with the results obtained for grapevine moth Lobesia botrana | Efficacite larvicide de differents insecticides incorpores au milieu artificiel d'elevage sur les vers de la grappe. 1. Tests sur cochylis Eupoecilia ambiguella et comparaison avec les tests sur eudemis Lobesia botrana
Charmillot, P.J. | Pasquier, D. | Verneau, S.(Agroscope RAC Changins, Station federale de recherches agronomiques, Nyon (Switzerland))
Nine insecticides were incorporated at different concentrations in artificial diet to determine their larvicidal effectiveness on grape berry moth Eupoecilia ambiguella from a laboratory strain originally collected in the region along the Lake of Geneva. A first evaluation was made after 14 days of rearing. Surviving individuals were then kept until adult emergence. Dose-mortality curves have been established. Efficiency varied widely among the tested insecticides. Seven out of nine products had a good potential to control grape berry moth as their LC50 values ranged from 0.02 to I ppm: methoxyfenolide, spinosad, flufenoxuron, tebufenozide, indoxacarb, chlorpyrifos- methyl and teflubenzuron. Concerning chlorpyrifos-ethyl (Pyrinex), its high LC50 of approximately 100 ppm can be attributed to the microencapsulated formulation that probably does not allow a good diffusion of active ingredients into the diet. Diflubenzuron does not present any interest for controlling grape berry moth. Methoxyfenozide and tebufenozide are potentially a little more effective on grape berry moth than on grapevine moth. Spinosad is appreciably more active on grape berry moth whereas teflubenzuron is clearly more effective on grapevine moth.
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