Objectives:

• To test three herbicides for repression spacing in excessively dense lodgepole pine by applying herbicides in strips and counting the killed and damaged trees.

Experimental Design:

Treatments

• Four treatments were tested. These were Vision® in water (6 litres of product in 100 litres of carrier per ha.), Release® in water (8 litres of product in 100 litres of water per ha.), Release® in oil (8 litres of product in 100 litres of carrier per ha.), and a no-treatment control. All treatments were ground applications with backpack sprayers.

Layout

• The study is a randomized complete block, with three strips (100m x 3 m) of each of the four treatments. There is a l m no-spray buffer between each strip.
• Twenty assessment plots (r = 1.26 m) were used in each strip, spaced at 5 m intervals down the centre of each strip.

History:

• 1994 - Pre-treatment assessment and spray application (July 6)
• 1995 - Second season assessment in fall
• 1996 - Final Report

Status: Dormant

Reports and Publications:

Thompson, C.F., R. Dominy, and G. Reichenback. 1997. Screening Trial for Herbicides used for Repression Spacing in Lodgepole Pine. Final Report, B.C. Min. For. Unpubl. Rep., Nelson, B.C.

Thompson, C.F. 1997. Screening Trial for Herbicides used for Repression Spacing in Lodgepole Pine. B.C. Min Forests, Nelson Region, Research Summary RS-033.

Comments:

Release was more effective than Vision®, and Release® in water was recommended for further trial.