Abstract
Microplitis croceipes (Cresson), a parasitoid ofHeliothis spp., was treated topically with field rates of 5 formulated insecticides commonly used in cotton to controlHeliothis spp. Treatment with the pyrethroid fenvalerate, a mixture of the formamidine chlordimeform plus fenvalerate, and the carbamate thiodicarb resulted in nearly 100% survival at both the lowest and highest field rates recommended for these insecticides. The organophosphate acephate and the carbamate methomyl were extremely toxic to adultM. croceipes, causing 100% mortality at the lowest recommended field rates.
Comparisons are made to previously reported laboratory toxicity data for some of these insecticides for adultM. croceipes. Choice of insecticides to control pyrethroid-resistantHeliothis spp., and the effects of these insecticides on adultM. croceipes survival, are discussed.
Résumé
Microplitis croceipes (Cresson), parasite d'Heliothis spp., était soumis aux différentes doses d'applications en plein champ de 5 formulations insecticides utilisées en culture de coton pour lutter contreHeliothis (F.).
Le résultat des applications du fenvalerate, du mélange chlordimeform plus fenvalerate, et du thiodicarb était une survie d'environ 100%, aux doses d'utilisation aussi bien faibles qu'élevées de ces insecticides. Par contre, l'acéphate et le méthomyl se sont montrés extrêmement toxiques vis-à-vis des adultes deM. croceipes, en causant une mortalité de 100%, même à la dose d'application la plus faible utilisée.
Ces résultats ont été comparés aux données des études antérieures menées en laboratoire sur la toxicité de certains de ces insecticides vis-à-vis des adultes deM. croceipes.
Enfin, le choix de l'insecticide pour lutter contre l'Heliothis spp. resistant aux pyréthrinoïdes et l'effect de ces insecticides sur l'adulte deM. croceipes ont été également discutés.
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Elzen, G.W., O'Brien, P.J., Snodgrass, G.L. et al. Susceptibility of the parasitoidMicroplitis croceipes [Hymenoptera: Braconidae] to field rates of selected cotton insecticides. Entomophaga 32, 545–550 (1987). https://doi.org/10.1007/BF02373523
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DOI: https://doi.org/10.1007/BF02373523