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Synergistic Effect of Some Additives on the Biological Activity and Toxicity of Neem-Based Formulations against the Cowpea Aphid, Aphis craccivora Koch

Published online by Cambridge University Press:  19 September 2011

Nadia Z. Dimetry  and
Fatma M. A. El-Hawary
Nadia Z. Dimetry*
Affiliation:
Department of Pests and Plant Protection, National Research Centre, Dokki, Cairo, Egypt
Fatma M. A. El-Hawary
Affiliation:
Department of Pests and Plant Protection, National Research Centre, Dokki, Cairo, Egypt
*
Corresponding author: NZD.
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Abstract

The effects of various concentrations of Neem Azal-T and Neem Azal-T/S as natural insecticides on the biology and percentage mortality of adult Aphis craccwora Koch were studied under laboratory conditions. Both extracts had an aphicidal effect against the adults and significantly decreased their fecundities and longevities. Addition of synergists such as ethyl oleate, sesame oil and dimethyl sulphoxide (DMSO) improved the aphicidal effects of both insecticides. The biological activity of Neem Azal-T/S only could be enhanced with suitable additives as they adversely affected the fecundity and longevity in comparison to the extract alone. Addition of CaCO3 to the above extracts had no clear effect on either neem seed extract formulation.

Résumé

Les effets de différentes concentrations de Neem Azal-T et Neem Azal-T/S, produits utilisés comme insecticides naturels agissant sur la biologie et le taux de mortalité des adultes de Aphis craccivora Koch ont été étudiés dans les conditions de laboratoire. Les deux extraits ont montré un effet aphicide contre les adultes et ont réduit leur fécondité et leur longévité d'une façon significative. L'incorporation des matières synergiques comme l'éthyle-oléate, l'huile de sésame et le diméthyle-sulphoxide (DMSO) a amélioré l'effet aphicide des deux insecticides. L'activité biologique de Neem Azal-T/S pouvait seulement être augmenté moyennant l'incorporation des adjuvants appropriés et ceci réduisait la fécondité et la longévité, en comparaison avec l'utilisation de l'extrait brut seul. L'addition du CaO3 à ces deux produits n'a pas montré d'effet apparent sur la formulation des extraits obtenus à partir de graines de nim.

Keywords

additivesAphis craccivora Kochneem seed extract formulationsadditifsAphis craccivora Kochformulations des extraits de grains de nim
Type
Research Articles
Information
International Journal of Tropical Insect Science , Volume 17 , Issue 3-4 , December 1997 , pp. 395 - 399
Copyright
Copyright © ICIPE 1997

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