Here are strategies to improve weed control for each herbicide-tolerant (HT) canola system. See the graph and table at the bottom for comparisons and extra details.
Clearfield
Group 2 products for the Clearfield system perform well with coarse sprays. Treat crops during warm weather when weeds are actively growing and soil moisture is adequate for rapid growth. Under cool or dry conditions, control for some weeds may be severely reduced and the risk of crop injury increases. Do not spray Group 2s if temperatures of 5°C or lower are forecast within 3 days of application.
Crop staging
The application window is 2- to 7-leaf stage of the crop for Ares (imazamox and imazapyr), and 2- to 6-leaf stage for other IMI products. Growers have various product choices, with several different tank mix partners. Only one application per season (no split applications) of Ares or any related product. Note that imazapyr in Ares has some flushing weed control from residual soil activity.
If thistles are a target: Add Lontrel at 84 mL/acre.
Liberty Link (glufonsinate tolerant)
Apply Liberty as medium to slightly coarse droplets (approximately 200 – 350 microns) with water volumes of at least 10 gallons per acre. Liberty works best on sunny, warm humid days when weeds are actively growing.
Most control issues for Liberty and other herbicides that rely heavily on contact activity are related to poor coverage from insufficient water carrier volumes, combined with a coarse or very course spray pattern and/or late stage at application.
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