If tests come back postive, giant ragweed will be the second weed in Manitoba, after kochia, to be resistant to glyphosate.  | File photo

Glyphosate resistant weed suspected in Man.

Manitoba may have another glyphosate-resistant weed. Last year, a grower in eastern Manitoba discovered a specimen of giant ragweed that seemed to have immunity to glyphosate, the active ingredient in Roundup. The giant ragweed, found in a field of soybeans, is now being tested in a lab. “It will take several months before the results […] Read more

Agriculture Canada and Manitoba government experts confirmed in 2014 that two locations had kochia with resistance to glyphosate in the province's Red River Valley. | File photo

More kochia resistant to glyphosate in Man.

CARMAN, Man. — Manitoba has more cases of glyphosate resistant kochia, but the details won’t be made public until later this year. Agriculture Canada and Manitoba government experts confirmed in 2014 that two locations had kochia with resistance to glyphosate in the province’s Red River Valley. Jeanette Gaultier, Manitoba Agriculture weed specialist, said a number […] Read more

Farmers at the Farming Smarter field school July 11 got an update on glyphosate resistant kochia and checked the efficacy of various herbicide treatments in test plots.  |  Barb Glen photo

Growers urged to take up kochia fight

A reminder to watch for glyphosate resistant kochia was issued last week to southern Alberta farmers. Resistant weeds were found last fall near Warner, Alta., and Agriculture Canada researchers Bob Blackshaw and Hugh Beckie have trials underway to assess the ability of 24 tank mixes at various rates to kill the troublesome weed. Those at […] Read more