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Infection of Termites by Spodoptera littoralis Nuclear Polyhedrosis Virus

Published online by Cambridge University Press:  19 September 2011

Ahlam A. Al Fazairy  and
F. A. Hassan
Ahlam A. Al Fazairy
Affiliation:
Entomology Division, Plant Protection Department, Faculty of Agriculture, University of Alexandria, Alexandria, Egypt
F. A. Hassan
Affiliation:
Sabahia Research Station, Alexandria, Ministry of Agriculture, Egypt
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Abstract

A nuclear polyhedrosis virus isolated from the Egyptian cotton leafworm, Spodoptera littoralis, was found to infect termite castes of Kalotermes flavicollis. Laboratory studies indicated that no specific trend toward mortality responses among the different individuals of termites was noted. All test castes of termites, young, middle-sized, old and reproductive nymphs, and soldiers, were quite equal in their response to the virus infection, regardless of whether the virus concentration was high or low; a concentration of 6.4 × 108 polyhedra/ml, killed only 64% of the treated individuals, while the dosage of 6.4 × 107 polyhedra/ml produced over 90% mortality. Also, thesame trend of response was recorded with the survivors which received challenge doses of NPV suspension each 9 or 10 days. On the other hand, these results revealed that if the NPV is used to control termites, periodic applications would be more efficacious thanone treatment. Virus symptoms were recorded in all affected insects.

Résumé

Le noyau polyhedrosé d'un virus isolé d'une feuille de coton égyptien, Spodoptera littoralis était établi d'infecter les termites do Kalotermes flavicollis. Les études du laboratoire ont indiqués qu'aucune réponse de mortalité specifique n'a eu tendance dans les différents termites. Tous les essais sur les termires jeunes, moyennes et vieilles aussi sur les nymphes reproductrice, les soldats, tous les essaies étaient égaux dans leur résultats pour l'infection du virus, la vue de la concentration du virus etait élevée ou basse. Une concentration de 6.4 × 108 polyhedra'ml tua seulement 64% des individus traités. Quand la dose était de 6.4 × 107 polyhedra/ml elle produit plus de 90% de mort. Aussi, la même tendency de la résponse était enregistré avec les survivants qui ont reçu des doses de NPV en suspension chacun de 9 ou 10 jours. Pour d'autres, ces résultats ont réveélé que si le NPV était employé pour le contrôle des termites les applications périodiques seraient plus efficaces qu' un seule traitement. Les symptômes des virus enrégistrés étaient sue tous les insectes affectés.

Keywords

TermitesKalotermes flavicollisIsopteraSpodoptera littoralisvirusnuclear polyhedrosis virusinfectivity testssymptomatology
Type
Research Articles
Information
International Journal of Tropical Insect Science , Volume 9 , Issue 1 , February 1988 , pp. 37 - 39
Copyright
Copyright © ICIPE 1988

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