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...

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...

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...

Yield losses caused by kochia competition are high, with mean losses reported to be 68% in grain corn, 62% in sorghum, 52% in soybean, 46% in sugar beet, 40% in silage corn, 23% in sunflower, 20% in spring wheat, 13% in canola and field pea,...

Layering Group 14 herbicides saflufenacil or carfentrazone + sulfentrazone pre-plant with a Group 2/6 imazamox/bentazon post-emergent treatment can effectively control glyphosate- and ALS inhibitor-resistant (Group 9 + 2) kochia in field pea. Layering will also help to reduce herbicide selection pressure through the use of...

Weed control has typically focussed on preventing yield loss with the side benefit of controlling weed seed return to the seedbank. This research proposes to turn that approach on its head by developing an understanding of when weed control is critical to prevent the return...

A randomized-stratified survey of 315 sites in Manitoba found that, overall, 58% of the kochia populations tested were glyphosate-resistant, while 1% were dicamba-resistant. There was a rapid increase in glyphosate-resistant kochia over a five-year time frame, and the survey also confirms the first cases of...

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