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January 2, 2014

SERVING MANITOBA FARMERS SINCE 1925 | Vol. 72, No. 1

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$1.75

manitobacooperator.ca

dashing into the new year

Dan Meggison of Two Creeks Ranch 13 miles south of Deloraine, Manitoba and his wife Heather and granddaughter Kelsey return to the farm after an afternoon sleigh ride. Over the holidays, Keegan their 14-year-old Trakehner stallion enjoys the winter exercise.   photo: sandy black

Glyphosate-resistant weeds a real and present danger Canadian farmers are being warned to be careful not to lose their most precious weed-control resource By Allan Dawson

Publication Mail Agreement 40069240

co-operator staff / banff

I

t’s like an episode of the old TV show “The Twilight Zone” — farmers repeatedly spray their crops but the weeds refuse to die. But that’s reality for many farmers in the mid-southern United States. Glyphosate, “the world’s greatest herbicide,” is no longer effective there due to an explosion of glyphosate-resistant weeds caused by a lack of agronomic

diversity, says University of Arkansas weed scientist Jason Norsworthy. Ca n a d i a n f a r m e r s m u s t take steps to avoid the same fate, Norsworthy and other experts warned during Bayer CropScience’s inaugural agronomy summit here last month. Fifty per cent of Arkansas’ cotton fields are now hand weeded and some producers have even lost their farms, Norsworthy said. Canadian farmers are also at risk, said Neil Harker, a research

scientist with Agriculture and Agri-Food Canada at Lacombe, Alta. “If we go to the same intensity with one, single-trait rotation like RR (Roundup Ready) corn, RR cotton, RR soybean like they have, which we have the potential to do in Western Canada... we’re going to be in a similar situation,” he said. Western Canada has some advantages over Arkansas. Most crops are grown in narrow rows, making them more competitive with weeds. The growing season

is shorter and glyphosate isn’t applied as often. “But we could be in a similar situation if we go the same direction,” Harker cautioned. “We’re just a few years behind in terms of our selection pressure.”

Protecting the resource

During his formal address Harker emphasized herbicides are “a precious, limited resource.” “We’re approaching a cliff,” he See RESISTANT on page 6 »


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