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An association between the fungus Sphaeropsis sapinea and the cone bug Gastrodes grossipes in cones of Pinus nigra in Italy

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Abstract:

Tip blight caused by is a well-known disease in pine plantations in Italy. Austrian pine , which was largely used in afforestation programmes during past decades, has recently suffered great damage from this pathogen. The incidence of the fungus in third-year cones was investigated in four stands. The percentage of cones infected with the fungus varied from 17 to 62%. Infected cones were observed on trees lacking symptoms of the disease as well as on those showing tip blight. The possible association of with the cone bug , which inhabits mature and open cones of pines, was examined by log-linear analysis. The cone bug was found in up to 67% of cones. Results revealed that the presence of and in pine cones was not independent; thus, a role of the insect in disseminating the fungus is hypothesized.

French
Résumé

Association entre Sphaeropsis sapinea et Gastrodes grossipes chez les cônes de Pinus nigra en Italie

La maladie des pousses àSphaeropsis sapinea est bien connue dans les plantations de pins en Italie. Le pin noir d'Autriche, Pinus nigra, qui a été largement utilisé dans les programmes de reboisement au cours des décades passées, a subi récemment de graves dommages par ce parasite. L'incidence du champignon chez les cônes de trois ans a étéétudiée dans quatre peuplements. Le pourcentage de cônes infectés variait de 17 à 62%. Les cônes infectés ont été observés sur des arbres sans symptômes aussi bien que sur des arbres présentant des dépérissements de pousses. L'association possible entre S. sapinea et Gastrodes grossipes, insecte qui s'installe sur des cônes matures et ouverts, a étéétudiée par analyse log-linéaire. L'insecte a été trouvé jusque dans 67% des cônes. Les résultats montrent que la présence de S. sapinea et celle de G. grossipes dans les cônes ne sont pas indépendantes. On peut donc supposer que l'insecte joue un rôle dans la dissémination du champignon.

Document Type: Research Article

DOI: http://dx.doi.org/10.1046/j.1439-0329.2002.00286.x

Affiliations: Dipartimento di Biotecnologie Agrarie, Sezioni di Entomologia Agraria e di Patologia vegetale, Università di Firenze – Piazzale delle Cascine 18, I-50144 Firenze, Italy; Email:, Email: capretti@ipaf.fi.cnr.it

Publication date: August 1, 2002

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