Since the introduction of herbicide-resistant canola systems, difficult-to-control species such as cleavers, volunteer canola, green foxtail, and foxtail barley have increased in abundance. Green foxtail was associated with glyphosate-resistant systems. Wild oat was predominant in longer canola rotations with glufosinate and imidazolinone-resistant canola. Herbicide-resistant (HR) canola...

Fierce provided 99% visible control and biomass reduction of glyphosate-resistant downy brome 8 weeks after treatment. High rates of Focus and Heat Complete, and two rates of Authority Supreme provided excellent control greater than 90%. Glyphosate-resistant downy brome was confirmed in a glyphosate-resistant canola field in...

Group 1 and Group 2 herbicide-resistant weed patches were widespread in Saskatchewan covering an estimated 15.315 million acres (6.198 million ha) in a total field area of 28.211 million acres (11.417 million ha). Given the linear increase in herbicide-resistant weeds, every annually cropped field in...

Single and sequential applications of glufosinate provided excellent control of Group 2 and Group 2 + 9 resistant kochia. Treatments containing sulfentrazone (which were experimental and not registered) caused excellent control but unacceptable crop injury. Layering strategies with ethalfluralin and/or carfentrazone followed by glufosinate may...

Integrated weed management (IWM) strategies using increased seeding rates, 2 years of early cut silage barley, and a rotation with competitive winter cereals improved control of wild oat and foxtail species (green and yellow). Treatments with IWM also improved control of lamb’s quarters, cleavers, kochia,...

Glyphosate resistance was detected in 87% of kochia samples, while 45% were dicamba-resistant Kochia resistant to multiple modes of action is a significant problem across the Canadian Prairies. Herbicide resistance to Group 2 ALS inhibitors  was first identified on the Prairies in 1988, and a 2007...

Over the period 1996 to 2020, the farm level economic benefits from genetically modified crops increased global farm income by $261.3 billion US dollars. In Canada, the average farm income increase from growing herbicide tolerant canola was $23.49/ac ($58.01/ha). Genetically modified (GM) soybean, corn, cotton and...

Overwintering kochia plants, 7 to 8 months after plant senescence the previous fall, retained an estimated 2091 ± 297 seeds per plant in May. This represented an average estimated at 18.5 ± 1.9% of total seed production. Research has shown that kochia has a relatively short...

The efficacy of weak-acid herbicides is improved with acidic spray water pH. Hard-water antagonism is more prevalent with weak-acid herbicides. Spray solution temperature between 18 C and 44 C is optimum for some weak-acid herbicides. The effect of water turbidity is severe on herbicides with...

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