Digging into Research
Patch expansion was attributed mainly to natural seed dispersal or seed movement by equipment at time of seeding. Extensive seed shed from plants in patches before harvest or control of herbicide resistant plants by alternative herbicides minimized seed movement by the combine harvester. Wild oat plants...
A survey of early adopters of physical impact mills found that wild oat (60%) and kochia (50%) were the weeds most frequently mentioned as specific motivators for impact mill purchase. Average increased fuel cost for a mill was estimated at $1.40/ac, with average annual maintenance...
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...
In winter wheat cropping systems, pre-plant weed management combined with two in-crop fungicide applications optimized grain yield. An in-crop herbicide application proved to be unnecessary, however multiple applications of fungicides were needed to optimize grain yield and grain protein concentration. Winter wheat can offer substantial economic...
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...
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...
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...
