Grainews (Vol 37, NO. 13)

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Volume 37, Number 13 | July/August, 2011

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COULDA SHOULDA

PRACTICAL PRODUCTION TIPS FOR THE PRAIRIE FARMER

WOULDA DID

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Three steps to effective pre-harvest weed control

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Knowing which perennial weeds you need to control and what growth stage they are at is key to whether or not pre-harvest glyphosate is worth it. As a dry-down tool, glyphosate isn’t the fastest option BY SCOTT GARVEY

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t this stage in the crop year, many farmers are thinking about making a late-season application of glyphosate to control perennial weeds. A pre-harvest pass can be effective weed control, but if it’s applied at the wrong time or under the wrong conditions, it’s just wasted time and money. Farmers shouldn’t rely on it to desiccate a crop, contrary to popular belief. “Weed control should be the primary consideration in the decision to use glyphosate prior to harvest,” says Brent Flaten, integrated pest management specialist with the Saskatchewan Ministry of Agriculture. “Glyphosate is not a desiccant; it’s very slow to dry down crop material. It’s not quick acting like Reglone.”

GLYPHOSATE IS NOT A DESICCANT “In a lot of instances, it’s mistakenly used as a desiccant,” says Dale Risula, provincial specialist for spe-

cialty crops with the Saskatchewan Ministry of Agriculture. He says that lentil growers should avoid it entirely in pre-harvest applications on that crop. “It would probably be wise not to use glyphosate as a pre-harvest treatment for weed control (in lentils),” he says. The reason is the acceptable limit for glyphosate residue on imported lentils is much lower in Europe than in Canada and the U.S. “They (Europeans) have a onepart-per-million residue limit on lentils,” he says. “In Canada, it’s four and in the U.S. it’s five.” From a practical standpoint, it may be impossible to achieve a level that low after making a pre-harvest pass. “The timing of application is really crucial,” he says. “In the event it’s applied too early, you can even get glyphosate levels above our own limits.” Flaten agrees, and he says if perennial weeds are a problem in a lentil crop, it may be best to wait until after harvest to try and control them. “Considering the European

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NEW HOLLAND PHOTO.

Making a pre-harvest glyphosate application can be useful at controlling perennial weeds. Farmers need to scout their fields to ensure weeds are at the correct growth stage to get the best long-term control.

In This Issue

Publications Mail Agreement Number 40069240

Wheat & Chaff ..................

2

Features..............................

5

Crop Advisor’s Casebook .. 10 Farmer Panel .................... 13 Columns ........................... 15 Cattleman’s Corner .......... 28

Growing winter wheat on unseeded acres LYNDSEY SMITH

COULDA

SHOULDA

WOULDA

PAGE 5

Coverage of Regina’s Farm Progress Show

Machinery & Shop ............ 32 FarmLife ............................ 41

SCOTT GARVEY PAGE 32

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