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The impact of glyphosate on shrub forage availability for ungulates is a source of concern for wildlife habitat and forest management on Vancouver Island. Shrub lowlands and southfacing slopes at low elevation are critical habitat for Roosevelt elk and Sitka black-tailed deer (Nyberg and Janz, 1990). The immediate post-treatment impacts on cover and height, and the post-treatment rates of recovery for forage species are best examined with permanent pre-treatment plot establishment and adequate controls for long-term monitoring.
A series of glyphosate pre-treatment assessments have been completed on habitat units on Vancouver Island. All sites are considered representative of non-satisfactorily restocked (NSR) forest sites that would be operationally treated with glyphosate to assist in achievement of free-to-grow states for coniferous cropp trees. Nine vegetation monitoring plot (sites) were established in regenerating forest cut blocks on Vancouver Island. These blocks were planned for operational foliar glyphosate treatments during 1991.
Grainger, K. L., Enns, K. A.. 1991. Impacts of Operational Foliar Glyphosate Applications on Ungulate Forage Values: Pre-Treatment Report. BC Ministry of Environment
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