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LABORATORY AND FIELD EVALUATION OF A NEEM INSECTICIDE AGAINST ARCHIPS ROSANUS L. (LEPIDOPTERA: TORTRICIDAE)

Published online by Cambridge University Press:  31 May 2012

M.T. AliNiazee ,
Amin Alhumeyri  and
M. Saeed
M.T. AliNiazee
Affiliation:
Department of Entomology, Oregon State University, Corvallis, Oregon, USA 97331-2907
Amin Alhumeyri
Affiliation:
Department of Entomology, Oregon State University, Corvallis, Oregon, USA 97331-2907
M. Saeed
Affiliation:
Department of Entomology, Oregon State University, Corvallis, Oregon, USA 97331-2907
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Abstract

A commercial formulation of neem seed extract, Margosan-O, containing 0.3% AI azadirachtin, was tested under laboratory and field conditions against the European leafroller, Archips rosanus L. In laboratory tests, a 1% aqueous solution of neem insecticide produced 100% larval mortality within 48 h of treatment. At lower concentrations of 0.1 and 0.01%, 48-h mortality rates were reduced. Prolonged deleterious effects of sublethal treatments of neem were observed even at the lowest concentration (0.001%) tested. Mortality in the 0.1 and 0.01% treatments group reached 100% within 32–39 days after treatment. Field data showed that 3 weeks after application, 1% Margosan-O was as effective as the organophosphate insecticide diazinon and significantly more effective than the microbial insecticide Dipel (Bacillus thuringiensis). Larvae exposed to higher concentrations of neem died within 48 h after feeding on treated foliage. At lower rates, feeding deterrence (including cessation of feeding) and growth regulatory effects (e.g. difficulty in molting, abnormal larval growth, and formation of malformed pupae and adults) were recorded.

Résumé

L’efficacité d’une préparation commerciale d’un extrait de la graine du margousier, le Margosan-O, qui contient 0,3% AI d’azadirachtine, a été éprouvée en laboratoire et sur le terrain dans la lutte contre la Tordeuse européenne Archips rosanus L. En laboratoire, une solution aqueuse 1% de l’insecticide causait la mort de 100% des larves en moins de 48 h. À des concentrations plus faibles, 0,1 et 0,01%, les taux de mortalité après 48 h étaient moins élevés. Des effets toxiques prolongés de traitements sublétaux ont été observés même aux concentrations les plus faibles utilisées (0,001%). Chez les groupes traités aux concentrations de 0,1 et 0,01%, la mortalité atteignait 100% en 32–39 jours. Les données sur le terrain ont révélé que, 3 semaines après l’application, le Margosan-O 1% était aussi efficace que l’insecticide organophosphaté diazinon et significativement plus efficace que l’insecticide microbien Dipel (Bacillus thuringiensis). Les larves exposées à des concentrations plus fortes de l’insecticide sont mortes moins de 48 h après consommation de feuillage traité. Aux concentrations plus faibles, l’insecticide avait des effets négatifs sur l’alimentation (jusqu’à l’arrêt complet) et la croissance (e.g. difficulté de muer, croissance larvaire anormale, production de crysalides et d’adultes anormaux).

[Traduit par la Rédaction]

Type
Articles
Information
The Canadian Entomologist , Volume 129 , Issue 1 , February 1997 , pp. 27 - 33
Copyright
Copyright © Entomological Society of Canada 1997

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