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Effectiveness of nuclear polyhedrosis virus and insecticides against the cotton leafworm, Spodoptera littoralis (Boisd.)

Published online by Cambridge University Press:  19 September 2011

Sayed M. Moawed  and
Ibrahim M. Elnabrawy
Sayed M. Moawed
Affiliation:
Pests and Plant Protection Laboratory, National Research Centre, Dokki, Cairo, Egypt
Ibrahim M. Elnabrawy
Affiliation:
Pests and Plant Protection Laboratory, National Research Centre, Dokki, Cairo, Egypt
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Abstract

The relative pathogenicity and toxicity of nuclear polyhedrosis virus of the cotton leafworm, Spodoptera litioralis (Boisd.) (SLNPV) and three pesticides, namely DC–702, DC–703 and DC–800, were investigated against the second- and fourth-instar larvae of S. littoralis. Results revealed that the second instar was more susceptible to the action of all treatments than the fourth instar. Among the tested insecticides, DC–703 was most toxic for either instars, followed by DC–800 and DC–702 for the second instar larvae. Fourth-instar larvae were more susceptible to DC–702 and DC–800, respectively. Combination of virus and DC–702 gave increased larval mortality when compared with the effects of either alone. On the other hand, antagonistic effect occurred when DC–703 was combined with NPV. This may be due to the high percentage of diflubenzuron (4.8%) as one of the components of DC–703, while DC-702 contains only 2.4% diflubenzuron. Synergistic interactions of mixtures containing low concentrations of SLNPV and DC–702 or DC–800 may be effective against S. littoralis and more safe for other biotic control agents.

Résumé

La pathogendicité relative et al toxicité de la polyédrose nucléaire de S. littoralis en relation avec trois pesticides: DC–702, DC–703 et DC–800 ont été étudié contre les 2e et 3e stades larvaires de l'insecte. Les resultats ont indiqué la sensibilite du 2e stade vis-à-vis aux traitements par rapport au 3e. Parmis les insecticides testés le DC–703 a été le plus toxique pour les deux stades, suivi par DC–800 et DC–702 contre le 2e stade, Le stade 4 a été plus sennible contre DC–702 et DC–800 respectivement. Les facteurs de la co-toxicité ont montré que le melange polyédres-DC–702 a été le plus efficace. L'effet antagonistique a été nettement montré par le melange polyèdres DC–703, cet effect est probablement due an pourcentage de “diflubenzuron” (4.8%) comme agent dans DC–703, tandis que ce pourcentage dans DC–702 atteint 2.4.

Le synergisme du melange de faibles concentrations des polyèdres et DC–702 ou DC–800 peut être le plus éfficace contre S. littoralis et moins dangereux contre des divers agents de lutte biologique.

Keywords

S. littoralisNPVchemical insecticides
Type
Research Articles
Information
International Journal of Tropical Insect Science , Volume 8 , Issue 1 , February 1987 , pp. 89 - 93
Copyright
Copyright © ICIPE 1987

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