Oxidiazon, at rates tested, controlled weeds very effectively, but was only tolerated by Western Redcedar. It merits operational trials at 2 kg a.i./ha on redcedar, and further experiments at lower concentrations on other species.
Bifenox controls weeds effectively, but in contrast was toxic to Cedar but well tolerated by Douglas-fir. It is clear that seedlings of conifer species vary as greatly as weed species, to herbicides.
Prometryne applied at sowing, has proven safe and given considerable weed control in previous trials, and followed with Propazine at 28 days post-germination forms an effective and safe treatment for all specIes, particularly interior spruce.
Glyphosate proved too phytotoxic at 4 weeks post-germInation, but 7 weeks post-germination
treatments could be considered as an alternative to propazine.
All Herbicides - more equal in effectiveness in the sandy soil at Surrey Nursery, compared to heavier soils at Koksilah.
For further details: R. van den Driessche 1981. Comparison of Glyphosate, Bifenox. and Oxidiazon herbicides. Final Report E.P. 693.21. Research Branch, B.C. MOF.
BC Forest Service - Research Division. 1981. Notes on relative herbicidal efficiency and tolerance of conifers in bare root nursery trials in 1980. British Columbia Ministry of Forests, Lands, Natural Resource Operations and Rural Development. Research Memo (FLNRORD). RM48
Topic: FLNRORD Research Program
Keywords: FLNRORD, Research Memo, British Columbia
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