A research trial was established in 1986 in the southern interior of British Columbia to study the effects of glyphosate applied at 3 and 6 L/ha (1.05 and 2.1 Kg ai/ha) and manual cutting for release of 4-year-old planted Douglas-fir seedlings from the Mixed Hardwood Shrub Complex vegetation. Douglas-fir seedlings and three target species (paper birch, thimbleberry, and fireweed) were assessed for 3 years following treatment, and then again in the ninth year. Reductions in cover and height of birch following broadcast glyphosate application significantly improved Douglas-fir growth; however, because birch is resistant to Armillaria root disease, helps improve long-term productivity, and enhances biodiversity, care should be taken not to affect birch more than necessary to ensure acceptable Douglas-fir performance.
Simard, S.W., Heineman, J.L.. 2015. Nine-Year Response of Douglas-Fir and the Mixed Hardwood-Shrub Complex to Chemical and Manual Release Treatments on an ICHmw2 Site Near Salmon Arm. British Columbia Ministry of Forests, Lands, Natural Resource Operations and Rural Development. FRDA Research Report. FRR257
Topic: FLNRORD Research Program
Keywords: Vegetation, Management
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