No CrossRef data available.
Article contents
Effectiveness of nuclear polyhedrosis virus and insecticides against the cotton leafworm, Spodoptera littoralis (Boisd.)
Published online by Cambridge University Press: 19 September 2011
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.
- Type
- Research Articles
- Information
- Copyright
- Copyright © ICIPE 1987
References
REFERENCES
Abbott, W. S. (1925) A method of computing the effectiveness of an insecticide. J. Econ. Entomol. 18, 265–267.CrossRefGoogle Scholar
Abdallah, S., Omar, A., El-Tantawy, M., Khidr, A. and El-Nabarawy, I. (1985) The efficiency of certain insecticides against Spodoptera littoralis (Boisd.) and Heliothis armigera (Hubn.). Alexandria Sci. Exch. 6, 160–174.Google Scholar
Angus, T. A. (1973) Perspectives of biological insect control. In Regulation of insect populations by microorganisms. Ann. N. Y. Acad. Sci. 217, 4–7.CrossRefGoogle Scholar
Bergold, G. H. (1947) Die Isolierung des Polyedervirus und die Nature der Polyeder, Z. Naturforsch. 2b, 122–143.CrossRefGoogle Scholar
Falcon, L. A. (1973) Biological factors that effect the success of microbial insecticides: Development of integrated control Ann. N.Y. Acad. Sci. 217, 173–186.CrossRefGoogle Scholar
Hafez, M., Kamel, A. A. M., Mostafa, T. H., and Omar, E. E. (1970) Field test of combinations of polyhedrosis virus suspensions and certain chemical insecticides for control of the cotton leafworm, Spodoptera littoralis (Boisd.) (Lepidoptera:Noctuidae). Bull. ent. Soc. Egypt, Econ. Ser. 4, 65–69.Google Scholar
Harris, C. R. and Svec, H. J. (1968) Toxicological studies on cutworms. I. Laboratory studies in the toxicity of insecticides to the dark-sided cutworm. J. Econ. Ent. 61, 788–793.CrossRefGoogle Scholar
Hassan, S. M. (1962) Effect of toxaphene on larvae of the cotton leafworm, Prodenia litura (F.), infected by polyhedrosis disease. (In Arabic). 3rd Cotton Conf. Cairo. 1823–1827.Google Scholar
Hassan, S. M. and Moawed, S. M. (1973) Combination (of virus + insecticides) for control of cotton leafworm, Spodoptera littoralis (Boisd.). 1st Pest Control Conf. Assiut. Cairo. 129–132.Google Scholar
Hassan, S. M. and Moawed, S. M. (1974a) New technique for rearing virus-free colonies of cotton leafworm, Spodoptera littoralis (Boisd.). 2nd Pest Control Conf. Alexandria Univ. Egypt 202–206.Google Scholar
Hassan, S. M. and Moawed, S. M. (1974b) Toxicological studies on the effect of nuclear polyhedrosis for control of the cotton leafworm, Spodoptera littoralis (Boisd.). Sym posium on the use of isotopes in pesticides and pest control, Beirut, Lebanon, 175–180.Google Scholar
Khalid, R. A., Abdel-Megeed, M. I. and Zidan, Z. H. (1974) Relative speed of toxicity of various insecticides orally and topically applied to the cotton leafworm larvae. Spodoptera littoralis (Boisd.). Bull. ent. Soc. Egypt. Econ. Ser. 8, 131–136.Google Scholar
Mansour, N. A., Eldefrawi, M. E., Tappozada, A. and Zeid, M. (1966) Toxicological studies on the Egyptian cotton leafworm, Prodenia litura. 6: Potentiation and antagonism of organophosphorus and carbamate insecticides. J. Econ. Ent. 59, 307–311.CrossRefGoogle Scholar
Pfrimmer, T. R. (1979) Heliothis spp.: Control on cotton with pyrethroids, carbamates, organophosphates and biological insecticides. J. Econ. Ent. 72, 593–598.CrossRefGoogle Scholar
Salama, H. S., Dimetry, N. Z. and Salem, S. A. (1971) On the host preference and biology of the cotton leafworm, Spodoptera littoralis (Boisd.). Z. angew. Ent. 67, 261–266.CrossRefGoogle Scholar
Salama, H. S., Foda, M. S., Zaki, F. N. and Moawad, S. (1984) Potency of combinations of .Bacillus thuringiensis and chemical insecticides on Spodoptera littoralis (Lepidoptera: Noctuidae). J. Econ. Ent. 77, 885–890.CrossRefGoogle Scholar
Vander-Geest, L. P. S. (1968) A method for the purification of polyhedra. J. Invert. Path. 11, 502.CrossRefGoogle Scholar