Résumés
Abstract
The health condition of Castanea sativa in the Stiavnicko-krupinská region of Slovakia was evaluated and the incidence of the fungus Cryphonectria parasitica was noted. A total of 2274 trees were examined. The degree of injury was expressed on a scale varying from zero to five and an index of health condition, IHC, was calculated from these data. The values of IHC varied from 0.12 to 1.36. From 1992 to 1997, we treated 714 cankers using hypovirulent strains of C. parasitica obtained from INRA Clermont-Ferrand. Callusing was observed on 32.7% of the treated cankers.
Keywords:
- Castanea satina,
- Cryphonectria parasitica,
- dsRNA,
- health condition,
- hypovirus,
- protection of woody plants
Résumé
[Résultats de la lutte biologique appliquée sur Castanea sativa en Slovaquie]
Le but de cette étude consistait à évaluer la vigueur de 2274 arbres de Castanea sativa dans la sous-région Stiavnicko-krupinská, en Slovaquie. Le degré de dommage des arbres a été évalué et exprimé selon une échelle de zéro à cinq et un indice de la vigueur des arbres, IhC, fut tiré de ces données Les valeurs de IhC variaient de 0,12 à 1,36. De 1992 à 1997, nous avons traité 714 chancres dans quatre sites avec des souches hypovirulentes de Cryphonectria parasitica obtenues de la Mycothèque INRA Clermont-Ferrand. Les traitements ont amené la cicatrisation d’environ 32,7 % des chancres traités.
Mots clés:
- ARN à double brin,
- Castanea satina,
- Cryphonectria parasitica,
- hypovisurs,
- protection des plantes ligneuses,
- vigueur
Parties annexes
References
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