Slide Presentation

TITLE    (click title to view slides)
2018 Sweet Corn Weed Control

AUTHOR
Stanley Culpepper
Professor and Extension Weed Specialist
University of Georgia

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TABLE OF CONTENTS
  1. 2018 Sweet Corn Weed Control
  2. No Emerged Weeds At Planting
  3. Preemergence!
  4. Apply PRE right after seeding!
  5. Apply PRE right after seeding!
  6. Percent Texas Millet Control at Harvest In Conventional Sweet Corn. TyTy, GA.
  7. Sweet Corn and Texas Millet Response to Laudis Systems. Ty Ty, GA.
  8. Sweet Corn and Texas Millet Response to Laudis Systems. Ty Ty, GA.
  9. Sweet Corn and Texas Millet Response to Laudis Systems. Ty Ty, GA.
  10. Laudis 3.5 SC
  11. Laudis 3.5 SC
  12. Laudis: Carryover Concerns?
  13. Apply PRE right after seeding!
  14. Plowing Destroys the Herbicide Layer
  15. Roundup WMAX On Sweet Corn
  16. Grasses should not be issue in RR Sweet Corn
  17. Percent GR Palmer amaranth Control at Harvest In RR Sweet Corn. TyTy, GA.
  18. Percent Morningglory Control at Harvest In RR Sweet Corn. TyTy, GA 2012.
  19. Roundup WMAX On Sweet Corn
  20. Nutsedge in Sweet Corn



SLIDE CONTENTS
  1. 2018 Sweet Corn Weed Control Herbicide active ingredients: > 18 Tillage Cover crops Hand weeding
  2. No Emerged Weeds At Planting Cover Crop Burndown Tillage
  3. Preemergence! Roundup (3 d preplant) Gramoxone Aim For ryegrass: Roundup fb by Gramoxone For horseweed: 2,4-D applied 7-14 d preplant. BURNDOWN:
  4. Apply PRE right after seeding! Atrazine (~1 qt/A) + Dual II Magnum (~1 pt/A) Dual and numerous alachlor products are available……….Dual II includes a safener which can make difference on sweet corn PRE:
  5. Apply PRE right after seeding! Atrazine + Prowl (early POST through 12”) Atrazine + Laudis (data looks great) POST OVERTOP
  6. Percent Texas Millet Control at Harvest In Conventional Sweet Corn. TyTy, GA. 36 c 78 b 97 a 97 a Atrazine Prowl + Atrazine Bicep II Mag Prowl + Atrazine Atrazine Laudis Bicep II Mag Laudis PRE POST Atrazine 1 qt/A; Bicep Mag. 2 qt/A; Laudis 3 oz/A.
  7. Sweet Corn and Texas Millet Response to Laudis Systems. Ty Ty, GA. Atrazine PRE Atrazine + Prowl POST Bicep II Magnum Prowl + Atrazine POST
  8. Sweet Corn and Texas Millet Response to Laudis Systems. Ty Ty, GA. Atrazine PRE Laudis + MSO 3” millet Bicep II Magnum Lauidis + MSO 3” millet
  9. Sweet Corn and Texas Millet Response to Laudis Systems. Ty Ty, GA. Non-treated control Laudis 3 oz + MSO to 6” millet
  10. Laudis 3.5 SC active ingredient = Tembotrione field corn, seed corn, sweet corn and popcorn controls crabgrass, goosegrass, broadleaf signalgrass, and Texas panicum (millet) up to 3 inches
  11. Laudis 3.5 SC do not apply to Merit or Shogun cultivars 3 oz product per acre from emergence to V7 include an MSO (methylated seed oil) can tank mix with atrazine only one application
  12. Laudis: Carryover Concerns? Label 4 months: grains 8 months: soybean 10 months: cotton, tomato, snapbean 18 months: cucurbits, other crops UGA has limited carryover data!
  13. Apply PRE right after seeding! Atrazine + Prowl (early POST through 12”) Atrazine + Laudis (data looks great) Callisto and Impact also labeled…less tolerance in our research. POST OVERTOP
  14. Plowing Destroys the Herbicide Layer If you plow, products like Dual Magnum, Prowl and/or Atrazine applied after plowing would be beneficial.
  15. Roundup WMAX On Sweet Corn Emergence through 8 leaf collars or 30” whichever comes first. One application of WMAX at 32 oz/A + atrazine prior to 12 inch corn Two applications of WMAX at 22 oz/A if avoiding atrazine for carryover concern. Max use rate 44 oz/A, don’t exceed 4.1 qt/A. 10 d between application, 30 d PHI
  16. Grasses should not be issue in RR Sweet Corn Non-treated Control
  17. Percent GR Palmer amaranth Control at Harvest In RR Sweet Corn. TyTy, GA. 78 b 99 a 99 a 99 a Atrazine RU WMax Dual II Mag RU + Atrazine None RU WMax Bicep II Mag RU + Atrazine PRE POST Atrazine 1 qt/A; Bicep Mag. 2 qt/A; Dual II Mag. 1 pt; WMax 1 qt per acre.
  18. Percent Morningglory Control at Harvest In RR Sweet Corn. TyTy, GA 2012. 99 a 75 c 92 a 83 b 96 a Atrazine RU WMax Dual II Mag RU WMAX Dual II Mag RU + Atrazine None RU WMax Bicep II Mag RU + Atrazine PRE POST Atrazine 1 qt/A; Bicep Mag. 2 qt/A; Dual II Mag. 1 pt; Laudis 3 oz; WMax 1 qt per acre.
  19. Roundup WMAX On Sweet Corn Glyphosate-resistant Palmer amaranth world Residual applied at planting (Dual II + atrazine) Residual tank mixed with Roundup Does offer more flexibility in cropping systems
  20. Nutsedge in Sweet Corn RR System: Sequential applications of Roundup and Sandea (top notch) Conventional Corn: Sandea 0.67 oz/A from spike through layby. “Injury is responsibility of grower”.