Forest Investment Account

Abstract of FII Project R04-063

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Biological control of western hemlock dwarf mistletoe

Author(s): Van Der Kamp, Bart J. (University of British Columbia)
Subject: Biometrics, Forestry, Pathology, Silviculture/Forest Management Systems
Series: Forest Investment Account (FIA) - Forest Science Program


The introduction of various harvesting systems other than clearcutting on the coast will significantly increase the impact of hemlock dwarf mistletoe. Initial results of a project to develop biological controls for mistletoe indicate that Colletotrichum gloeosporioides (C.g.), sprayed as a conidial preparation, leads to significant mortality of shoots and abortion of fruit, while Neonectria neomacrospora (N.n.) conidia (assessed by sporodochia production only) appear to require bark wounds or newly cut mistletoe shoots for infection. This proposal seeks support for: 1) Selection of virulent strains of C.g., determination of specificity of C.g. on pine and hemlock mistletoe, and use of existing DM models to estimate efficacy given the degree of control achieved so far; 2) final assessment using dissection and culturing to determine true infection rates as well as the precise infection site of N.n.; and 3) assessment of persistence of both parasites

For further information, please contact Bart J. van der Kamp, University of British Columbia (

Updated September 08, 2005 

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