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FUNGUS DISEASES AFFECTING ADELGES PICEAE IN THE FIR FOREST OF THE GASPÉ PENINSULA, QUEBEC

Published online by Cambridge University Press:  31 May 2012

W. A. Smirnoff
W. A. Smirnoff
Affiliation:
Forest Research Laboratory, Department of Fisheries and Forestry, Quebec, Quebec
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Abstract

In 1966–67, the following fungi were isolated on Adelges piceae (Ratz.), a serious pest on fir trees in the Gaspé Peninsula: Fusarium larvarum, Cephalosporium coccorum, Entomophthora sp., Aspergillus fumigatus, Aspergillus nigra, Penicillium thomii, Penicillium sp., Cladosporium sp., Isaria farinosa, and Beauveria sp. F. larvarum showed more evidence of pathogenicity for Adelges, while C. coccorum was considered a facultative pathogen. There were not enough cases of infection by Isaria, Beauveria, and Entomophthora to determine their activity. Remaining species were saprophytic. Pathogenicity tests were conducted in the field with F. larvarum and C. coccorum. The fungi were introduced in the population by spraying or dusting, or by mites. However, a variety of external factors made it impossible to determine accurately the degree of virulence of these fungi for Adelges.

Résumé

Dans la péninsule de Gaspé, en 1966–67, les Champignons suivants ont été isolés de l’insecte Adelges piceae (Ratz.) qui infestait les Sapins beaumiers (Abies balsamea (L.) Mill.) : Fusarium larvarum, Cephalosporium coccorum, Entomophthora sp., Aspergillus fumigatus, Aspergillus nigra, Penicillium thomii, Penicillium sp., Cladosporium sp., Isaria farinosa et Beauveria sp. Le F. larvarum s’avérait nettement pathogène tandis que le C. coccorum était facultatif. Il n’y avait pas suffisamment de cas d’infection par Isaria, Beauveria et Entomophthora pour que l’auteur puisse déterminer leur activité. Les autres espèces étaient saprophytes. Sur F. larvarum et C. coccorum, les épreuves de pathogénicité ont eu lieu sur le terrain : les Champignons étaient introduits par poudrage pulvérisations ou par des acariens. Certains facteurs externes ont cependant empêché la détermination précise du degré de virulence que ces Champignons possèdent sur Adelges.

Type
Articles
Information
The Canadian Entomologist , Volume 102 , Issue 7 , July 1970 , pp. 799 - 805
Copyright
Copyright © Entomological Society of Canada 1970

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