Canadian Forest Service Publications
The nature of the association of Europhium trinacriforme with pole blight lesions. 1957. Parker, A.K. Canadian Journal of Botany 35(6): 845-856.
Issued by: Pacific Forestry Centre
Catalog ID: 20783
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E. trinacriforme was isolated from 11% of the lesions on P. monticola affected with pole blight in the interior of British Columbia, and from 84% of the lesions on Pine on the coast. It was, however, unable to cause the pole-blight condition within a period of 4 years after inoculation of healthy Pine. On the basis of radial-growth analysis it was evident that lesions occur following a general reduction in radial increment and at the same time as, or shortly after, the first crown symptoms of pole blight appear. Radial growth below lesions was nearly always less than in other parts of the stem section, indicating that both the position and extent of lesions are determined before they occur. Studies indicate that E. trinacriforme most likely enters and extends lesions formed by other agents. KEYWORDS: plant disorders, Pinus monticola, diseases, pole blight, Pole blight, protection forests.