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ASSOCIATION OF PHYTOPATHOGENIC FUNGI FOR THE SCOTS PINE (PINUS SYLVESTRIS L.) WITH THE EUROPEAN PINE WEEVIL HYLOBIUS ABIETIS (L.) (COL. CURCULIONIDAE)

Published online by Cambridge University Press:  31 May 2012

J. Lévieux ,
D. Piou ,
P. Cassier ,
M. André  and
D. Guillaumin
J. Lévieux
Affiliation:
L.A. INRA, Université Orléans, 45067 Orléans Cedex 2, France — E.N.G.R.E.F., Domaine des Barres, 45290 Nogent sur Vernisson-France
D. Piou
Affiliation:
L.A. INRA, Université Orléans, 45067 Orléans Cedex 2, France — E.N.G.R.E.F., Domaine des Barres, 45290 Nogent sur Vernisson-France
P. Cassier
Affiliation:
Université Paris VI, Cytophysiologie des Arthropodes, 105 Bd Raspail, 75006 Paris, France
M. André
Affiliation:
Université Paris VI, Cytophysiologie des Arthropodes, 105 Bd Raspail, 75006 Paris, France
D. Guillaumin
Affiliation:
Université Paris VI, Cytophysiologie des Arthropodes, 105 Bd Raspail, 75006 Paris, France
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Abstract

In 1989 and 1990, the contamination rate of the European pine weevil Hylobius abietis (L.) by several pathogenic fungi for the Scots pine was measured [Leptographium procerum (Kendrick) Wingf. — 45% of the specimens; Pachnodium canum (Upadh. and Kendr.) — 14%; or Ophiostoma piliferum (Fries) H. and P. Syd — 3% (Piou 1993)]. To understand the processes of transportation, a detailed study was conducted by scanning electron microscopy. Several types of spores vectored are found mainly in the thoracic cuticular rounded wells located near the sensorial setae. These wells are connected with an epidermal glandular apparatus whose ultrastructural description is given. We question the origin and composition of these secretions which are believed to protect the spores and contribute to the infection process.

Résumé

En 1989 et 1990, on a mesuré en Forêt d’Orléans (France) le taux de contamination du charançon européen Hylobius abietis (L.) par plusieurs champignons phytopathogènes comme Leptographium procerum (Kendrick) Wingf. — 45% des individus; Pachnodium canum (Upadh. et Kendr.) — 14%; et Ophiostoma piliferum (Fries) H. et P. Syd — 3% (Piou 1993). L’étude du mode de transport des spores par l’insecte montre que celui ci s’effectue préférentiellement dans de nombreuses dépressions cuticulaires thoraciques voisines des soies sensorielles. Comme chez les scolytes, chaque dépression communique avec un système glandulaire de nature épidermique dont la description est donnée. On s’interroge pour savoir si les sécrétions de ces glandes pourraient servir à protéger les champignons ou aider à leur développement lors du transport ou de l’inoculation.

Type
Articles
Information
The Canadian Entomologist , Volume 126 , Issue 4 , August 1994 , pp. 929 - 936
Copyright
Copyright © Entomological Society of Canada 1994

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