Research Branch

See below to download.

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

Author(s) or contact(s): S.W. Simard and J.L. Heineman
Source: Research Branch
Subject: Vegetation Management
Series: FRDA Report
Other details:  Published 1996. Hardcopy is available.


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.

FRDA Research Report 257 (2514 KB)

To view this document you need the current version of
Adobe Acrobat Reader, available free from the Adobe Web Site.

Updated July 24, 2015