Abstract
This SX trial was established in the Kootenay Lake Forest District to evaluate the efficacy of hexazinone (Velpar-LŪ) and a manual brushing treatment on Black cottonwood (Populus trichocarpa) and Thimbleberry (Rubus parviflorus). The effects of these treatments on immature Engelmann spruce (Picea Engelmanni) were also monitored The study site is located in a 30 ha cutblock in the ICH mw2 subzone (Braumandl and Curran 1992). Four treatments were established in 0.075 ha units: two levels of hexazinone (2 and 4 mL), manual brushing and a control. The herbicide was applied in May 1986 and the manual treatment was completed in July 1986. Assessments were conducted pre-treatment, post-treatment (fall 1986) and two (fall 1987) and four (fall 1989) growing seasons after treatment. Velpar LŪ caused mild injury to thimbleberry and moderate to severe injury to cottonwood. The manual treatment appeared to be ineffective in controlling thimbleberry but had some effect on cottonwood. The change in height and diameter of the spruce was constant in all treatment units including the control, suggesting that the treatments did not have an effect on the growth of spruce. This trial was not replicated, therefore descriptive statistics (means) are presented and only obvious trends are discussed. A study with replication would have been a more useful design, as the efficacy of Velpar-LŪ and manual brushing treatments can be influenced by weather and site specific properties.
Download Nelson Region Technical Report TR-001 PDF file (852 KB)
To view this document you need the current version of
Adobe Acrobat Reader, available free from the
Adobe Web Site.
Updated April 12, 2007
|
