Postemergence
Clopyralid (Stinger, Clean Slate, and other trade names)
Rate 0.094 to 0.188 lb ai/A (0.25 to 0.5 pints/A Stinger, Clean Slate)
Time Apply to canola in the two- to six-leaf stage of crop growth.
Remarks Apply uniformly with aerial or ground equipment in 10 to 20 gal/A water or at least 5 gal/A by air. To control Canada thistle, apply after most basal leaves emerge but before bud stage. REI is 12 hr.
Caution Do not apply more than 2/3 pints/A per crop per year. PHI is 50 days. See product label for crop rotation restrictions. Avoid drift to non-target crops.
Site of action Group 4: synthetic auxin
Chemical family Pyridine
glufosinate (Liberty 280 SL)
LibertyLink canola varieties only
Rate 0.40 to 0.53 lb ai/A (22 to 29 fl oz/A product) postemergence; 0.59 to 0.79 lb ai/A (32 to 43 fl oz/A product) burndown preplant or preemergence
Time Applications on canola may be made from cotyledon stage up to early bolting stage of canola. Apply to small and actively growing weeds, targeting those less than 3 inches in height.
Remarks Weed control may be reduced if application is made when heavy dew, fog, or mist/rain are present, or when weeds are under stress due to drought, cool temperatures, or extended periods of cloudiness. Rainfast in 4 hr. REI is 12 hr.
Caution Use only on LibertyLink canola varieties. PHI is 65 days. Do not graze the treated crop or cut for hay. Do not add surfactants or crop oils (ammonium sulfate is allowed). Do not apply if canola shows injury from prior herbicide applications or environmental stress. Do not apply with other pesticides including herbicides unless recommended on the label. Do not apply more than 29 fl oz/A of Liberty 280 SL postemergence in a single application. If required, a second application up to 29 fl oz/A can be applied a minimum of 7 days after application. Do not apply more than 43 fl oz/A of Liberty 280 SL for burndown treatment prior to planting or prior to emergence. Do not apply more than 87 fl oz/A of Liberty 280 SL per growing season.
Site of action Group 10: inhibits glutamine synthase
Chemical family Phosphinic acid
glyphosate (Roundup)
Use only on Roundup Ready canola
Rate Single or sequential applications, refer to specific product label.
Time Make single application only to Roundup Ready canola no later than six-leaf stage, to control annual weeds. Apply sequentially on one- to three-leaf Roundup Ready canola followed by a sequential application at a minimum interval of 10 days but not later than the six-leaf stage.
Remarks Read product label before using any other glyphosate product on Roundup Ready canola. Overlapping at application may result in temporary yellowing, delayed flowering, and/or growth reduction. REI is 4 hr.
Caution Use only on Roundup Ready canola. Do not exceed two over-the-top broadcast applications from crop emergence through the six-leaf stage. Refer to specific product label for total in-crop application maximum application rates. Do not mix or apply with any other pesticide, additive, or fertilizer except as label directs. PHI is 60 days. Avoid drift to non-target crops.
Site of action Group 9: inhibits EPSP synthase
Chemical family Glycine
imazamox (Beyond)
Use only on Clearfield canola varieties
Rate 0.031 lb ai/A (4 oz/A Beyond)
Time Apply early postemergence, but before bloom, only to Clearfield canola. Apply when most actively growing annual grass weeds are in the one- to five-leaf stage. Broadleaf weeds should be actively growing and less than 3 inches tall.
Remarks Adding a nonionic surfactant and a liquid nitrogen fertilizer or ammonium sulfate solution is required. Occasionally, crop plants may have shortened internodes and/or temporary yellowing after Beyond applications; effects can be more pronounced if crops are growing under environmental stress. REI is 4 hr.
Caution Use only on Clearfield canola varieties. Do not exceed 4 fl oz/A per season. See product label for crop rotation restrictions. Avoid drift to non-target crops. Be aware there may be a long plant-back period to some non-Clearfield crops. Consult the label for specific plant-back information
Site of action Group 2: acetolactate synthase (ALS) inhibitor
Chemical family Imidazolinone