Evaluating the response of Galium species and populations to herbicides
Date
2014-03-11
Authors
Epp, I.G.
Willenborg, C.J.
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Abstract
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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Keywords
cleavers, canola, clomazone, quinclorac
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Soils and Crops Workshop