Stability of resistance among Pinuscontorta provenances to Lophodermellaconcolor needle cast

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Abstract
Lophodermellaconcolor needle cast was rated in 41 lodgepole pine (Pinuscontorta) provenance trials in the central and southern interior of British Columbia. Moist, low-elevation sites were most severely affected while sites at high elevation and in dry climatic zones were free of L. concolor. Lodgepole pine populations exhibited a high degree of stability (low site by provenance interaction) and genetic variability in resistance to L. concolor. These characteristics favor selecting resistant seed sources and incorporating them into genetically improved stock. Most provenances, other than those from the interior British Columbia and Alberta geographic region, were extremely susceptible to L. concolor. Susceptibility to L. concolor increased with the elevation of provenance for those provenances of interest to silviculturalists and tree improvement specialists in the interior of British Columbia.

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