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Weed Control in Sunflowers Eric P. Prostko Extension Weed Specialist Department of Crop & Soil Sciences The Universi

Weed Control in Sunflowers Eric P. Prostko Extension Weed Specialist Department of Crop & Soil Sciences The University of Georgia. Follow UGA Production Practices. Planting Date soil temp at least 60 0 F Plant Population 16,000 to 18,000 plants/A (Final) Row Spacing 24-36” Soil Fertility

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Weed Control in Sunflowers Eric P. Prostko Extension Weed Specialist Department of Crop & Soil Sciences The Universi

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  1. Weed Control in SunflowersEric P. ProstkoExtension Weed SpecialistDepartment of Crop & Soil SciencesThe University of Georgia

  2. Follow UGA Production Practices • Planting Date • soil temp at least 600F • Plant Population • 16,000 to 18,000 plants/A (Final) • Row Spacing • 24-36” • Soil Fertility • 6.0 pH • Fertilize according to soil test results

  3. What is labeled?(not much) • PPI • Sonalan or Treflan • PPI or PRE • Prowl, Dual Magnum, Spartan ($400/gal = $9.38-12.50/A @ 3-4 ozs/A) • POST • Arrow, Assure II, Select, Poast, SelectMax (grasses only) • Beyond (imazamox) • only on Clearfieldhybrids • Beyond same family as Cadre, Pursuit, and Scepter • Beyond costs about $525/gal (4 ozs/A = $16.41/A) • $157/bag (200,000 seed ~ 10 acres) = $15.70/A • Clearfield sunflower hybrids are not GMO’s

  4. Consider Cultivation

  5. Clearfield Sunflower Weed Control Results • Clearfield sunflower hybrids that I have worked with since 2003 • include the following: • Mycogen 8N429CL • Mycogen 8N386CL • Mycogen 8H419CL • Dekalb DKF 3880CL

  6. 2004 (7 WAP) NTC Prowl H2O @ 2 pt/A + Spartan @ 4 ozs/A (PRE)

  7. 2006 (7 WAP) Prowl H2O @ 2.1 pt/A Spartan 4F @ 4.0 oz/A PRE NTC

  8. 2004 (7 WAP) Prowl H2O @ 2 pt/A (PRE) Beyond @ 4 ozs/A + 80/20 + UAN (POST) NTC

  9. 2006 (7 WAP) Prowl H2O @ 2.1 pt/A Spartan 4F @ 4.0 oz/A PRE Prowl H2O @ 2.1 pt /A (PRE) Beyond @ 4 ozs/A + 80/20 + UAN (POST) NTC

  10. 2004 (7 WAP) Dual Magnum @ 1.33 pt/A (PRE) Beyond @ 4 ozs/A + 80/20 + UAN (POST) NTC

  11. Harvest Aids for Sunflowers • Paraquat • Gramoxone Inteon (1.2-2.0 pt/A) • Firestorm (0.8-1.3 pt/A) • Parazone (0.8-1.3 pt/A) • Sodium Chlorate • Defol 5 (4.8 qt/A) • Defol 750 (3.2 qt/A) • Helena 3 lb Sodium Chlorate ( 2 gal/A) • others

  12. UGA Weed Science www.gaweed.com

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