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PERSISTENCE OF NEODIPRION SERTIFER (HYMENOPTERA: DIPRIONIDAE) NUCLEAR POLYHEDROSIS VIRUS ON PINUS CONTORTA FOLIAGE

Published online by Cambridge University Press:  31 May 2012

W. J. Kaupp
W. J. Kaupp
Affiliation:
Forest Pest Management Institute, Canadian Forestry Service, Sault Ste. Marie, Ontario P6A 5M7
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Abstract

The persistence of Neodiprion sertifer nuclear polyhedrosis virus (NPV) on Pinus contorta foliage samples collected from sawfly infested plantations located throughout Britain was studied. Sawfly density and disease epizootiology varied between localities. Results from the bioassay of branch samples, divided into bark, needle base and foliage samples, indicated that N. sertifer NPV produced during a single virus epizootic can persist for at least 2 years on the pine foliage. Bark and needle base samples were found to be contaminated with NPV more often than foliage samples, perhaps reflecting the effect of weathering on the persistence of virus on the needle surface.

Résumé

On a étudié la persistence du virus qui cause la polyhédrose nucléaire (VPN) chez Neodiprion sertifer, sur des échantillons de feuillage de Pinus conforta, prélevés dans des plantations infestées par le diprion partout en Grande-Bretagne. La densité des populations de diprions et l'incidence de la maladie variaient d'un endroit à l'autre. D'après les essais biologiques réalisés sur des échantillons de branches subdivisés en échantillons d'écorce, de bases d'aiguilles et de feuillage, ce VPN produit au cours d'une seule épizootie peut persister au moins deux ans sur le feuillage du pin. On a observé que les échantillons d'écorce et de bases d'aiguilles étaient contaminés par le VPN plus souvent que ceux de feuillage, ce qui reflète peut-être les effets de l'exposition aux éléments sur la persistence du virus à la surface des aiguilles.

Type
Articles
Information
The Canadian Entomologist , Volume 115 , Issue 7 , July 1983 , pp. 869 - 873
Copyright
Copyright © Entomological Society of Canada 1983

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