Grainews

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Volume 42, Number 9  |  April 5, 2016

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PR A C T I C A L PR O D U C T I O N T IP S F O R T H E PR A IRI E F A R M E R

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FIGHTING HERBICIDE-RESISTANCE Herbicide resistant weeds aren’t a novelty anymore — now they’re just the norm By Lisa Guenther

W

hile herbicide resistance isn’t a new problem, it is a growing one. Today 80 countries report herbicide-resistant weeds, says a researcher. And Canada is near the top of that list. Dr. Ian Heap heads the international survey on herbicide-resistant weeds, and reported those findings at the Herbicide Resistance Summit in Saskatoon this March. “North America as a whole has more herbicide-resistant weeds than any other continent. And Canada is actually quite high up on that list,” he said during an interview. In fact, Canada ranks third globally when it comes to the number of herbicide-resistant weeds.

Why does Canada rank so high on that list? “It’s really because you have a massive land area and you’ve been using herbicides for so long that you’ve been selecting herbicide-resistant weeds,” Heap said. Closer to home, researchers with Agriculture and Agri-Food Canada are surveying farmers’ fields to see how much resistance has eroded herbicide efficacy in Western Canada. Dr. Hugh Beckie presented findings from the 2014-15 Saskatchewan weeds surveys, which were led by Dr. Julia Leeson. Researchers do the surveys every five or 10 years, he said. Manitoba is next on the list, and they plan to scout Alberta fields in 2017, Beckie said. Researchers survey fields in July, after weed manage-

ment is done, so they can look at weeds farmers are not controlling, he added. Researchers did the baseline surveys in the early 2000s, and found herbicideresistant weeds on about 20 per cent of fields, Beckie said. They haven’t finished screening for herbicide resistance from the latest survey, but Beckie expects “well over 50 per cent of cultivated land in Saskatchewan will have a herbicide-resistant weed.” “Certainly the trend is continuing upward, which is what our model predictions indicate. We don’t have any new herbicide chemistries in the last 30 years and so growers have had to use the same tools to manage their populations, whether they’re resistant or not. So inevitably, if we don’t have

TOP 10 WEEDS IN SASKATCHEWAN The 10 most abundant weeds in Saskatchewan include: 1.  Wild oat 2.  Green foxtail 3.  Wild buckwheat 4.  Volunteer canola 5.  Canada thistle 6.  Spiny annual sow thistle 7.  Cleavers 8.  Lamb’s quarters 9.  Narrow-leaved hawk’s beard 10. Dandelion Source:  Agriculture and Agri-Food Canada’s 2014-15 Saskatchewan Weed Survey

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Wild oat is the most abundant weed in Saskatchewan. Researcher Hugh Beckie says it’s safe to assume that wild oat in your field is resistant to Group 1 herbicides.

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In This Issue

Wheat & Chaff .................. 2 Features . ........................... 5 Crop Advisor’s Casebook . 8 Columns ............................ 18 Machinery & Shop............. 28 Cattleman’s Corner .......... 35

land rental tips

welding outside corners

angela lovell page 14

SCOTT GARVEY page 32

FarmLife ............................ 39


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