Abstract
Twenty families of single‐ascospore isolates of the canker pathogen Crumenulopsis sororia were collected from eight trees of Pinus sylvestris in a native pinewood. Measurements were made of growth rate of each isolate in the presence and absence of a saturating atmosphere of the five principal monoterpenes of P. sylvestris cortical oleoresin (α‐pinene, β‐pinene, 3‐carene, β‐myrcene and limonene).All monoterpenes significantly reduced the mean linear growth rate of the C. sororia population. However, there was highly significant genetic variation among isolates in their tolerance of all five monoterpenes. The extent of genetic variation was greatest for β‐myrcene and limonene tolerance, and least for α‐pinene and 3‐carene tolerance. Significant positive correlations between tolerance of different monoterpenes were found, implying the presence of tolerance mechanisms common to a range of compounds.
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