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CANOLA WEED MANAGEMENT Eric P. Prostko and Tim L. Grey Extension Weed Specialist and Research Weed Scientist The Univers

CANOLA WEED MANAGEMENT Eric P. Prostko and Tim L. Grey Extension Weed Specialist and Research Weed Scientist The University of Georgia. April 2007. Before Getting Started. What herbicides were used in previous crops? Canola is very sensitive to herbicide residues!!.

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CANOLA WEED MANAGEMENT Eric P. Prostko and Tim L. Grey Extension Weed Specialist and Research Weed Scientist The Univers

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  1. CANOLA WEED MANAGEMENT Eric P. Prostko and Tim L. Grey Extension Weed Specialist and Research Weed Scientist The University of Georgia April 2007

  2. Before Getting Started • What herbicides were used in previous crops? • Canola is very sensitive to herbicide residues!!

  3. Canola Rotation Restrictions FB = Field Bioassay

  4. Avoid Planting Canola in Wild Radish/Mustard Fields

  5. Follow All UGA Recommended Production Practices • Adapted Variety • Planting Date • North Zone (September 10 to October 25) • South Zone (October 10 to November 15) • Row Spacing (6-12”) • Seeding Rate (4-6 lbs/A) • Fertility Management

  6. Herbicides For Use in Georgia Canola • Glyphosate • at-planting but before crop emergence • Treflan,Trilin, etc. • PPI • Select/Arrow, Poast, Assure/Targa • POST (grass control) • Beyond • POST • Clearfield varieties only!!!!

  7. Trifluralin in Canola • Incorporate to depth of 2-3” within 24 hours of application • 2-pass system • 0.50-0.75 lb ai/A • some control of winter annual grasses, henbit, and chickweed • no control of wild radish/mustard • Better than nothing!

  8. Clearfield Canola Production Systems • Non-GMO • Beyond (imazamox) is only herbicide registered for use in U.S. • Based on UGA field trials, eliminates concerns for Cadre (imazapic) carryover problems. However, Clearfield canola is NOT listed on Cadre label.

  9. Clearfield Canola varieties only!!!!! • Beyond 1AS (imazamox) • 4 oz/A + NIS @ 0.25% v/v + UAN @ 2.5% v/v • weeds less than 3” tall • In UGA field trials, Beyond has provided good to excellent control of Italian ryegrass, wild radish and shepherd’s-purse when applied between 24 and 37 DAP. • $515/gal ($16.09/A)

  10. ROTATIONAL CROP RESTRICTIONS FOR BEYOND • 3 months = wheat • 4 months = barley, rye • 8.5 months = field/sweet corn • 9 months = cabbage, cantaloupe, carrot, cotton, cucumber, grain sorghum, oats, onion, peanut, pepper, tobacco, tomato, turnip, watermelon • 18 months = non-Clearfield canola

  11. Weed Control in Clearfield Canola with Beyond 1AS (4 oz/A) + COC (1% v/v) + 37% UAN (2 qts/A) Grey et al. 2006. Weed Technology 20:551-557

  12. Stinger • clopyralid • labeled but not yet recommended by UGA • 3 lb ai/gal • 4-8 oz/A ($15-30/A) • 2 to 6 leaf stage of canola • 50 day PHI • Canada thistle, sowthistle, dandelion, chamomile • Rotations • 0 months = field corn, wheat, barley, oats • 10.5 months = grain sorghum, onions, sunflowers • 18 months = all other crops

  13. Other Types of Herbicide-Resistant Canola • Roundup-Ready (RR) • Liberty-Link (LL) • both are not currently labeled for use in Georgia • Why? • Developed after Georgia stopped growing canola on a commercial basis • varieties more susceptible to blackleg • volunteer problem in other RR crops • herbicide resistance issues

  14. Weed Control in RR-Canola with Roundup Weathermax 5.5SL (22 oz/A) Grey et al. 2006. Weed Technology 20:551-557

  15. Weed Control in LL-Canola with Liberty 1.67SL (34 oz/A) + 21% AMS (3 lb/A) Grey et al. 2006. Weed Technology 20:551-557

  16. UGA Weed Science www.gaweed.com

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