Evaluating the response of Galium species and populations to herbicides
Canola (Brassica napus L.) is one of the most important grain crops in Western Canada. The recent profitability of canola has resulted in tightened crop rotations and increased acres devoted to canola production. Galium species, collectively known as cleavers, are highly competitive weeds, which represent the fastest growing weed species in Western Canada. The objectives of this study were to evaluate the efficacy of existing canola herbicides (glufosinate, glyphosate, imidazoline) and potential new herbicides (quinclorac and clomoazone) on Galium species. Field experiments were conducted in 2013 at Floral Saskatchewan and Scott Saskatchewan. A separate RCBD was set up for each herbicide tolerant system. In each RCBD 1 canola variety was chosen and seeded at a target density of 85 plants per m-2. Cleavers were planted at a target density of 85 plants per m-2. Variables measured were herbicide control, crop injury, canola biomass, cleaver biomass, canola height and yield. Data was subjected to ANOVA using the mixed model procedure in SAS. Cleaver biomass was the only variable found to be significant in all herbicide systems. All herbicide treatment significantly reduced cleaver biomass compared to the unsprayed check. In the glyphosate tolerant system yield was significant and a combination of preseed clomazone and in-crop glyphosate had the highest yield. In the imidazoline and glufosinate-ammonium system canola biomass was also found to be significant. Plant height was not significant in any of the herbicide systems.
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