The Mode of Infection of Lodgepole Pine by Crumenula sororia Karst. and the Susceptibility of Different Provenances to Attack

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Abstract
Experimental inoculations of C. sororia on un-wounded Lodgepole pine produced successful infections after 9 months in 25 per cent of cases, compared with 40–60 per cent where wounds were inoculated. After 16 months, however, these differences disappeared. The virulence of different isolates of C. sororia differed. Current year's shoots were more resistant to infection than 1-year-old shoots. Resistance was generally not a function of broad geographical origin, save in the southern coastal types. Some provenances were highly significantly more susceptible than other closely adjacent ones: Burns Lake and Salmon Arm were highly susceptible, whereas Fort St. James and Mount Ida provenances were respectively resistant. These observations agree closely with field survey data, thus validating the use of young plants to indicate resistance of older crops to infection.

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