glyphosate-resistant kochia - Canadian Agronomist

29 May Kochia control in glufosinate-resistant canola

Posted at 21:58h in Weeds

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...

12 Jul Glyphosate- and dicamba-resistant kochia spreads in Saskatchewan

Posted at 22:50h in Weeds

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...

22 Jun Kochia persists in aerial seedbanks

Posted at 16:38h in Weeds

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...

07 Feb Multiple resistant kochia continues to spread in Alberta

Posted at 22:45h in Weeds

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...

26 Jul Integrated crop-livestock systems may be effective tool for managing herbicide-resistant kochia

Posted at 22:23h in Agronomy

For livestock producers, kochia is relatively high in crude protein and can be used as an alternative forage for alfalfa, or ensiled and used as an alfalfa silage replacement. Integrated crop-livestock systems may offer alternative weed control methods that are effective for managing herbicide-resistant kochia...

20 Apr Controlling glyphosate-resistant kochia in field pea

Posted at 17:00h in Weeds

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...

07 Dec Herbicide-resistant kochia increases rapidly in Manitoba

Posted at 18:19h in Weeds

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...

22 Jun Herbicide-resistant weeds continue to increase

Posted at 16:37h in Weeds

Weed surveys show that the incidence of herbicide-resistant grassy and broadleaf weeds continues to increase across the Prairies during the survey periods of 2014 through 2017. The perceived cost of herbicide resistance was estimated at $13.36 per acre. Regular surveillance for herbicide-resistant (HR) weeds has been...