Canola (including Rape Seed)

Don Wysocki
Revised March 2014

CANOLA—Annual Grass and Some Broadleaf Weeds

ethalfluralin (Sonalan)

Rate 0.55 to 0.95 lb ai/A (5.5 to 9.5 lbs/A Sonalan 10G); 0.56 to 0.938 lb ai/A (1.5 to 2.5 pints/A Sonalan HFP)

Time Apply preplant and incorporate following label instructions.

Remarks Use either liquid or granular formulation. Proper soil preparation and incorporation of trifluralin are critical for best results.

Caution Do not exceed labeled rates because crop may be injured. Do not graze crop grown in treated soil.

Site of action Group 3: microtubule assembly inhibitor

Chemical family Dinitroaniline

trifluralin (Treflan)

Rate 0.5 to 1 lb ai/A (1 to 2 pints/A Treflan HFP)

Time Apply preplant and incorporate into soil.

Remarks Use either liquid or granular formulation. Proper soil preparation and incorporation of trifluralin are critical for best results. Trifluralin is weak on members of the mustard and sunflower families, and on volunteer cereals.

Caution Incorporate within 24 hours of applying. See label for crop rotation restrictions.

Site of action Group 3: microtubule assembly inhibitor

Chemical family Dinitroaniline

CANOLA—Annual and Perennial Grasses

Postemergence

clethodim (Select, Intensity One)

Rate 0.063 to 0.094 lb ai/A (4 to 6 fl oz/A Select 2EC)

Time After grasses emerge. See label for details.

Remarks Controls annual and perennial grasses. Use adjuvants recommended by the label.

Caution Do not exceed 12 fl oz/A per season. Do not apply more than 6 fl oz/A per application. Preharvest interval is 70 days. Do not graze. Do not apply after crop begins bolting. Application during bloom period may injure crop. Addition of fertilizer is not recommended for this crop.

Site of action Group 1: acetyl CoA Carboxylase (ACCase) inhibitor

Chemical family Cyclohexanedione

quizalofop P-ethyl (Assure II, Targa)

Rate 0.03 to 0.08 lb ai/A (5 to 12 fl oz/A Assure II)

Time Postemergence to grasses. See label for details.

Remarks Controls annual and perennial grasses. Does not control rattail fescue. Use either a non-ionic surfactant at 1 quart/100 gal of water or a petroleum-based crop oil at 1 gal/100 gal of water. Crop oil concentrates are the preferred adjuvant in arid regions

Caution Do not exceed 18 fl oz/A per season. Preharvest interval is 60 days. Do not graze.

Site of action Group 1: acetyl CoA Carboxylase (ACCase) inhibitor

Chemical family Aryloxyphenoxy propionate

sethoxydim (Poast)

Rate 0.19 to 0.47 lb ai/A (1 to 2.5 pints/A Poast)

Time Apply to actively growing grasses listed on label. Add 2 pints/A nonphytotoxic crop oil concentrate for ground application to improve leaf penetration.

Remarks Ask knowledgeable individuals about susceptible grasses in your area. Control may be erratic on grasses stressed by lack of vigor, drought, or high temperature. Fine fescues and annual bluegrass resist treatment; quackgrass is suppressed.

Caution Do not exceed 5 pints/A product per year. Preharvest interval is 60 days. Do not mix or apply with any other pesticide, additive, or fertilizer except as label directs.

Site of action Group 1: acetyl CoA Carboxylase (ACCase) inhibitor

Chemical family Cyclohexanedione

CANOLA—Annual Broadleaf Weeds

Postemergence

clopyralid (Stinger, Clopyr Ag)

Rate 0.094 to 0.188 lb ae/A (0.25 to 0.5 pint/A)

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.

Caution Apply no more than once per crop per year. Preharvest interval 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 (Ignite 280 SL)

LibertyLink canola varieties only

Rate 22 fl oz/A

Time Apply early postemergence, before weeds stress growth of canola, and canola is between cotyledon and early bolting stage.

Remarks Weed control may be reduced if application is made when heavy dew, fog, and mist/rain are present, or when weeds are under stress due to drought, cool temperatures or extended periods of cloudiness. Rainfast in 4 hours.

Caution Use only on LibertyLink canola varieties. Preharvest interval 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 22 fl oz/A of Ignite 280 SL per growing season.

Site of action Group 10: inhibits glutamine synthase

Chemical family Phosphinic acid

glyphosate (Roundup, Touchdown and other products)

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.

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. Preharvest interval is 60 days. Avoid drift to non-target crops.

Site of action Group 9: inhibits EPSP synthase

Chemical family None generally accepted

imazamox (Beyond)

Use only on Clearfield canola varieties

Rate 0.031 lb ai/A (4 fl 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.

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