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...

A research review of 89 canola studies found that the potential on-farm monetary loss from uncontrolled weeds in canola was about $2.21 billion on the Prairies, $0.16 billion in North Dakota, and $2.37 billion in both countries combined. Potential yield and financial losses from weed competition...

Quizalofop alone or in combination with imazamox, imazamox + bentazon, or imazamox/imazethapyr, and glufosinate mixed with clethodim resulted in more than 80% visible control, plant mortality, and reduction in biomass of glyphosate-resistant downy brome 21 days after treatment. Glyphosate-resistant downy brome was confirmed in a southern...

Growing soybean on high soil mineral nitrogen (N) fields, or when N fertilizer was applied in increasing rates, resulted in an increase in volunteer canola competition and a corresponding linear decrease in soybean yield. Research was conducted in Manitoba looking at the resource-ratio (R*) hypothesis. This...

Kochia with resistance to glyphosate was found at 78% of sites sampled, with 44% of sites exhibiting fluroxypyr resistance, and 28% with dicamba resistance. Triple resistance to Group 2 ALS inhibitors, Group 9 glyphosate, and one of the Group 4 synthetic auxins was found at...

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