Chemical and Manual Control of Thimbleberry (Rubus parviflorus) in Northwestern British Columbia: A Rate and Timing Trial1

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Abstract
The effects of different site preparation treatments and their timing on thimbleberry (Rubus parviflorus) percent cover were examined using a factorial experiment. Methods of thimbleberry control tested were: an untreated control, manual cutting, 1.4 kg active ingredient (a.i.)/ha glyphosate, and 2.1 kg a.i./ha glyphosate. Four treatment dates covering the growing season of thimbleberry in the study area were examined. In all 3 post-treatment years there was a strong interaction between method and timing of control. Thimbleberry percent cover in the manual cutting treatments was not significantly different from the untreated control in any of the years. Chemical treatments were less effective early in the growing season than those later on. Early midseason chemical applications were most effective at the higher rate. Late midseason and late season treatments provided uniformly excellent control at both the low and high rates of application. West. J. Appl. For. 6(4):99-102.

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