Pre-Emergent
Pre-emergent control of volunteer RR canola in Roundup Ready Corn and Soybeans
Volunteer canola and especially volunteer roundup ready canola can pose a problem in roundup ready crops like corn and soybeans. Early weed control is critical in maintaining maximum yield potential, so the earlier we can remove volunteers the better. This provides a relatively weed free environment for the seedlings to establish themselves, plus it helps to even out the staging of weeds for later post-emergent applications. Perhaps more important, anytime you can add another mode of action against weeds in a roundup ready rotation, the better it is for minimizing weed resistance.
Corn
Cleanstart: Group 9 – glyphosate and group 14 – carfentrazone
This product is applied prior to seeding the corn. This product controls roundup ready canola at the 1-3 leaf stage along with a list of other weeds. (See page 116 of the Guide to Field Crop Protection – 2015)
Focus: Group 14 – carfentrazone and group 15 – pyroxasulfone
This product can be applied prior to seeding and up to 3 days after seeding your corn. It controls volunteer roundup canola from pre-emergent up to 10cm tall. You can also add glyphosate to this mix. (See page 174 of Guide to Field Crop Protection – 2015)
Heat: Group 14 – saflufenacil
This product is applied prior to seeding the crop up until the emergence. You must mix it with glyphosate and Merge. Use the 59 ml/acre rate to help extend control of volunteer canola and supress the emergence. Heat also looks after many other broadleaf weeds. (See page 19 Guide to Field Crop Protection – 2015)
Soybeans
Authority Charge: Group 14 – carfentrazone and sulfentrazone.
This product is applied as a soil applied tank mix with glyphosate in the spring. It is applied to the soil surface prior to seeding the crop. It has a rate of 80-64 acres/case and depends greatly on organic matter and pH. (See page 88 of Guide to Field Crop Protection – 2015)
Cleanstart: Group 9 – glyphosate and group 14 – carfentrazone
This product is applied prior to seeding the soybeans. This product controls roundup ready canola at the 1-3 leaf stage along with a list of other weeds. (See page 116 of Guide to Field Crop Protection – 2015)
Express: Group 2 –tribenuron
This product can be applied with glyphosate prior to the seeding of soybeans. Allow 24 hours between application and seeding. Use only Express SG. (See page 294 of the Guide to Field Crop Protection – 2015)
Focus: Group 14 – carfentrazone and group 15 – pyroxasulfone
This product can be applied prior to seeding and up to 3 days after seeding your soybeans. It controls volunteer roundup canola from pre-emergent up to 10cm tall. You can also add glyphosate to this mix. (See page 174 of the Guide to Field Crop Protection – 2015)
Valtera: Group 14 – flumioxazin
This product is to be applied prior to seeding and up to 3 days after seeding prior to emergence. It provides suppression of volunteer canola along with control of a number of broadleaf weeds. (See page 169 of the Guide to Field Crop Protection – 2015)
**Always be sure to read and follow the labels plus check to be sure the products fit in your crop rotation. The agronomists at Shur-Gro Farm Services and Munro Farm Supplies Ltd are always available to go over crop and herbicide choices and rotations with you.
Post-EMERGENT: Corn
Armezon- Group 27- topramezone
This product is applied in crop (post-emergent) from 1 to 7 leaf, and must be tank mixed with glyphosate if used in RR Corn. This product controls volunteer RR canola, and many other broadleaf weeds. (See page 286 of the Guide to Field Crop Protection – 2015)
Permit- Group 2 – Halosulfuron
This product is applied in crop (post-emergent) up to the 10-12 leaf stage. May also be tank mixed with glyphosate. (See page 246 of the Guide to Field Crop Protection – 2015)
2,4-D- Group 4- 2,4-D
This is product is applied as an overall spray before the crop is 6 inches (15 cm) tall and before 6 leaf stage, After 6 inches(15 cm) use as a directed spray, avoid making applications under hot/humid conditions onto corn. 2,4-D will control volunteer canola of all herbicide tolerances. *Warning this product can be very hard on corn, and can be specific to certain corn varieties. (See page 69 of the Guide to Field Crop Protection – 2015)
Buctril M- Group 4 & 6 – Bromoxynil & MCPA
This product is applied in crop (post-emergent) from the 4-6 leaf stage in corn. Do not apply to corn if daytime temperatures exceed 27 degrees within 48 hours before or after application. (See page 111 of the Guide to Field Crop Protection – 2015)
Distinct- Group 4 & 19- Dicamba & Diflufenzopyr
This product can be applied post-emergent in corn from the 2nd– 6th leaf with a non-ionic surfactant and UAN (28-0-0) will control volunteer canola up to the 4th leaf. (See page 136 of the Guide to Field Crop Protection – 2015)
Dyvel DSp- Group 4 – Dicamba, 2,4-D & Mecoprop
This product is applied in crop before corn reaches 6 inches (15 cm) in height with the top leaf extended or by directed spray with drop nozzles once over 12 inches (30 cm).
*Warning this product can be very hard on corn under environmental stresses, corn will become brittle for 2 weeks after application. In-field mechanical processes and strong winds may cause stalk lodging during that time. (See page 141 of the Guide to Field Crop Protection – 2015)
Post-Emergent : Soybeans
Basagran/Basagran Forte – Group 6 (Bentazon).
No staging restrictions to spray on soybeans. (Basagran only, requires the addition of Assist or XA Oil concentrate at 0.41 to 0.81 L per acre). To control volunteer canola from emergence up to 8 leaf stage. Can be tank mixed with Pinnacle (2.2 – 3.2 g per acre). (See page 98 in the 2015 Guide to Field Crop Protection – 2015)
Flexstar GT – Group 9 & 14 (Glyphosate & Fomesafen).
Spray as pre-seed, pre-emergent or at 1 – 2 trifoliate staging. Must have adjuvant – Super Spreader @ 40 acres/jug. Controls canola up to the 4 leaf stage (*wild mustard on the label). Can add extra glyphosate in as tank mix (0.5 L per acre) if field merits it. (See page 158 in the 2015 Guide to Field Crop Protection – 2015)
Odyssey – Group 2 (Imazamox & Imazethapyr ).
Spray when soybeans are 1 – 3 trifoliate. Must have Merge adjuvant at 40 ac/jug. Controls volunteer canola up to the 4 leaf stage. (See page 237 in the 2015 Guide to Field Crop Protection – 2015)
Odyssey Ultra – Group 1 & 2.
(Imazamox & Imazethapyr plus Sethoxydim). Spray soybeans at 1 – 3 trifoliate. Must have Merge adjuvant at 40 ac/jug. Controls volunteer canola up to the 4 leaf stage. (See page 239 in the 2015 Guide to Field Crop Protection – 2015)
Pinnacle SG – Group 2 (Thifensulfuron).
Spray soybean at 1st-3rd trifoliate. Controls canola up to 4 inches tall (*wild mustard on the label). (See page 248 in the 2015 Guide to Field Crop Protection – 2015)
Reflex + Basagran – Group 14 (Fomesafen) + Group 6 (Bentazon).
Spray at 1 – 2 trifoliate leaf stage. Controls volunteer canola up to the 4 leaf stage. (See page 265 in the 2015 Guide to Field Crop Protection – 2015)
Viper ADV – Group 2 & 6 (Imazamox & Bentazon).
Spray from emergence to 3 trifoliate leaf stage. Controls volunteer canola up to the 4 leaf stage. Can be mixed with glyphosate. (See page 316 in the 2015 Guide to Field Crop Protection – 2015)
Cultural Practices
Cultural practices – 4 year crop rotation for canola. Light tillage or harrowing a canola field in the fall to get volunteers to grow & die the same winter. Following year is when most volunteer canola grows so seed a cereal crop after to help control volunteer canola plants.
