Research Branch

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Identification of Key Pathogens of Major Coastal Forest Weeds

Author(s) or contact(s): T.N. Sieber, F. Sieber-Canavesi, and C.E. Dorworth
Source: Research Branch
Subject: Vegetation Management
Series: FRDA Report
Other details:  Published 1990. Hardcopy is available.


Bigleaf maple (Acer macrophyllum) and red alder (Alnus rubra Bong.) are weeds in the Coast Forest Region of British Columbia, Canada, when they grow to the detriment of commercially valuable conifers. Research carried out at Pacific forestry Center, Forestry Canada, was directed toward biological control of bigleaf maple and red alder. The selection of candidate bioagents (mycoherbicides) was limited by the choice of native or indigenous microorganisms.

Three potentially pathogenic endophytes have been found on bigleaf maple: Cryptodiaporthe hystrix, Diaporthe eres, and Glomerella enqulata. Six pathogenic species have been isolated from red alder: Diaportthe eres, Gnomonia setacea, Gnomoniella tubaeformis, Melanconis alni, Nectria sp., and Septoria alni. These species were discussed in respect to their frequency of occurrence as endophytes, their morphology, as well as their pathogenicity and were used to calculate the Latent Disease Potential (LDP) at each site.

FRDA Research Report 113 (1445 KB)

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Updated July 24, 2015