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Recherche de sources de résistance au Coryneum (Seiridium) cardinale Wag. dans le genre Cupressus

J. Ponchet and Claudine Andreoli
Phytopathologia Mediterranea
Vol. 18 (1979), pp. 113-117
Stable URL: http://www.jstor.org/stable/42684440
Page Count: 5
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Since scans are not currently available to screen readers, please contact JSTOR User Support for access. We'll provide a PDF copy for your screen reader.
Recherche de sources de résistance au Coryneum (Seiridium) cardinale Wag. dans le genre Cupressus
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Abstract

Plusieurs espèces ou variétés de Cyprès de différentes provenances ont été comparées pour leur comportement vis-à-vis du Coryneum cardinale dans des conditions de forte contamination naturelle. Toutes ont été attaquées mais il existe d'importantes différences entre espèces, entre provenances d'une même espèce et entre arbres d'une même provenance. Les espèces C. macrocarpa, C. abramsiana et C. goveniana sont les plus sensibles; C. torulosa, C. dupreziana les plus résistantes. La variabilité génétique, très grande chez les Cyprès, doit être conservée et utilisée au maximum de son amplitude dans un objectif de sélection de cultivars ou de populations résistantes au C. cardinale grâce à une coopération internationale. Several species or varieties of Cupressus from different sources were tested for their comparative susceptibility to C. cardinale canker under heavy field inoculations provided by an infected cypress wind-screen hedge. All the species were intected but relative susceptibility appeared quite different between sources or even between individual trees from the same seedlings. C. macrocarpa, C. abramsiana and C. goveniana were the most susceptible species while C. torulosa and C. dupreziana showed promising relative resistance. C. arizonica and C. sempervirens had intermediate behaviour with noticeable differences between sources. From a practical standpoint, selection of resistant or tolerant varieties must take in consideration such a big genetic variability in cypress populations and a survey of pathogenic variation in C. cardinale. Investigations in this way need improved and fast testing methods and an international cooperation.

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