Keep It Clean: Rates and options for each HT system

May 17, 2017 - Issue 8

A key part of the Keep It Clean program is to follow label rates and timing for all crop protection products. Here are specifics for each herbicide-tolerant system.

Roundup Ready (glyphosate tolerant): The window is from seeding to the 6-leaf stage of the canola crop. Applying after the 6-leaf stage or above label rates is known to cause yield loss. Maximum use rates are 270 g ae per acre on one application or two applications of 180 g ae/acre each. When going after thistles, buckwheat, and large dandelions, a tank mix of glyphosate and Lontrel 360 (co-packaged as Eclipse) at the 112 ml/acre rate can be applied after the 2-leaf stage.

Liberty Link (glufosinate tolerant): The window is from emergence to early bolting. Set the rate based on weed species and pressure. Split application is an option, but the maximum allowable rate per season is 2.97 litres per acre. Liberty may be tank mixed with clethodim at 25.5 mL/acre or up to 77 mL/acre for Select and Centurion specifically for additional control of grassy weeds. The mixing order is unique when tank mixing clethodim with Liberty. Add the surfactant first, then Liberty, then clethodim. This is one of the only times when surfactant goes in the tank first. Click here for more on pesticide mixing rules.

—No Lontrel tank mix for Liberty. If using Lontrel for thistle control in Liberty Link canola, it should go on as a separate application, either before the Liberty application or after the thistles recover following the Liberty application. For acceptable control, Canada thistle should have ample leaf area in a living condition for contact and uptake. Canada thistle is 3 to 4 times more competitive per plant than wild oats. Research from AAFC in Lacombe, Alta., shows it only takes 10 Canada thistle shoots per square metre to cause 10% yield loss in canola.

Clearfield (IMI tolerant): The window is from the 2-leaf to the 6-leaf stages (7-leaf for Ares) You have a few different products to choose from with several different tank mix partners. Click the link below to see your provincial guide to crop protection. Odyssey Ultra, Ares or Tensile can be applied only once per season (no split or sequential applications), but Odyssey and Ares have some residual soil activity. If thistles are a target, Odyssey can be mixed with Lontrel at 0.17 to 0.23 L/acre. Tensile is a co-pack of Solo and the dry Lontrel formulation.

Note that nearly all kochia populations are resistant to Group 2 herbicides and there are no mixes with herbicides for Clearfield canola that will control kochia. There may also be rotational crop restrictions following the use of Clearfield herbicides.

Consult the guide to crop protection and/or product labels for recommended rates, staging, and tank mix partners. Click a province for a link to its guide to crop protection: Alberta Saskatchewan Manitoba.

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