Slide Presentation

TITLE    (click title to view slides)

AUTHOR
Eric P. Prostko
Professor and Extension Weed Specialist
University of Georgia

DOWNLOAD PRESENTATION    (right click and select 'Save Target As...')

TABLE OF CONTENTS
  1. Weed Control in Field Corn 2020
  2. Field Corn Yield Loss (%) Caused by Uncontrolled Weeds in UGA Weed Science Research Trials (2007-2019). Treated vs. Non-treated
  3. Field Corn Weed Contrl Questions for you?
  4. Pigweed Should Not Be a Problem!!!!
  5. A general plan of attack?
  6. Starting Clean
  7. To PRE or Not to PRE?
  8. Anthem Maxx, Dual, Outlook, Warrant, Zidua????
  9. Field Corn Weed Control - 2019 Roundup + Atrazine + Prowl H20 (~$18/A)
  10. Field Corn Weed Control - 2019 Roundup + Laudis + Atrazine (~$18/A)
  11. Field Corn Weed Control - 2019 Halex GT + Atrazine + NIS (~$24/A)
  12. Halex GT + Atrazine + NIS + Fungicides (Trivapro, Headline AMP, Stratego YLD)
  13. Field Corn Weed Control - 2019 Liberty + Atrazine (~$18/A)
  14. Field Corn Weed Control - 2019 Roundup + Impact Z (~$14/A)
  15. Field Corn Weed Control - 2019 Roundup + Engenia + Prowl H20 (~$18/A)
  16. Roundup W-Max @ 32 oz/A + Engenia @ 6.4 oz/A + Prowl H20 @ 32 oz/A (Applied 9 DAP, V1/2" tall field corn)
  17. Roundup W-Max @ 32 oz/A + Engenia @ 6.4 oz/A + Prowl H20 @ 32 oz/A (Applied 21 DAP, V4/7" tall field corn)
  18. Field Corn Weed Control - 2019 Roundup + Status + Prowl H20 (~$31/A)
  19. Field Corn Injury - Status (dicamba)
  20. Field Corn Yield (DKC-6208) As Influenced By Herbicide Treatment
  21. Field Corn Weed Control - 2019 Atrazine (PRE) fb Roundup + Acuron (POST) ($31/A)
  22. Public Enemy #1 in Field Corn
  23. Lay-By Rig for Morningglory
  24. Roundup Powermax II @ 32 oz/A + Evik 80DF @ 2 lbs/A - 36 DAT (June 15, 2018)
  25. Terrell Co. Lay-By - 2019 Roundup + Tricor
  26. Post-Harvest Palmer Amaranth Populations Must be Managed!
  27. Palmer Amaranth Burndown - 2019 (AMAPA 1-6" tall)
  28. Tropical Spiderwort/Benghal Dayflower (TSW/BD) After Corn Harvest
  29. Post-Harvest Control of TSW/BD with 2 Applications (14 d apart) of Gramoxone (paraquat)
  30. Questions/Comments?



SLIDE CONTENTS
  1. Eric P. Prostko, Ph.D. Professor/Extension Weed Specialist Dept. Crop & Soil Sciences Weed Control in Field Corn 2020
  2. Field Corn Yield Loss (%) Caused by Uncontrolled Weeds in UGA Weed Science Research Trials (2007-2019). Treated vs. Non-treated 200 Bu/A X 0.34 X $4.10 = $279/A
  3. Field Corn Weed Contrl Questions for you? What technologies are you planting? RR, LL, Conventional, Enlist (2,4-D)? Have you used Counter INFR? Is atrazine still working for you? What will be planted after the field corn?
  4. Pigweed Should Not Be a Problem!!!! moisture activated residual? atrazine resistance timing/coverage weeds too big corn too big environmental hot and dry #1 enemy POST’s
  5. A general plan of attack? MUST START CLEAN! Use 1 qt/A of Atrazine 4L PRE (or Dual II Magnum, or Warrant, or Outlook) Follow up with a timely POST program that includes an additional 1.5 qt/A of Atrazine 4L Lots of options depending upon how you answered previous questions?
  6. Starting Clean If you are getting ready to plant and get to the field and have pigweed > 6” tall ………… Park the sprayer Go get your mower, disk, and/or bottom plow
  7. To PRE or Not to PRE?
  8. Anthem Maxx, Dual, Outlook, Warrant, Zidua????
  9. Field Corn Weed Control – 2019 Roundup + Atrazine + Prowl H20 (~$18/A) CN-07-19 May 13 19 DAT NTC Roundup PowerMax @ 32 oz/A Atrazine @ 64 oz/A Prowl H20 @ 32 oz/A Applied 23 DAP (V5/8” tall)
  10. Field Corn Weed Control – 2019 Roundup + Laudis + Atrazine (~$18/A) CN-07-19 May 13 19 DAT NTC Roundup PowerMax @ 32 oz/A Laudis @ 3 oz/A Atrazine @ 64 oz/A Applied 23 DAP (V5/8” tall)
  11. Field Corn Weed Control – 2019 Halex GT + Atrazine + NIS (~$24/A) CN-07-19 May 13 19 DAT NTC Halex GT @ 58 oz/A Atrazine @ 64 oz/A NIS @ 0.25% v/v Applied 23 DAP (V5/8” tall)
  12. Halex GT + Atrazine + NIS + Fungicides (Trivapro, Headline AMP, Stratego YLD) CN-07-19 DKC6208 May 3 9 DAT
  13. Field Corn Weed Control – 2019 Liberty + Atrazine (~$18/A) CN-04-19 May 13 19 DAT NTC Liberty @ 32 oz/A Atrazine @ 64 oz/A Applied 22 DAP (V4/8” tall)
  14. Field Corn Weed Control – 2019 Roundup + Impact Z (~$14/A) CN-04-19 May 13 19 DAT NTC Roundup PowerMax @ 32 oz/A Impact Z @ 8 oz/A Applied 22 DAP (V4/8” tall)
  15. Field Corn Weed Control – 2019 Roundup + Engenia + Prowl H20 (~$18/A) CN-08-19 May 10 18 DAT NTC Roundup W-Max @ 32 oz/A Engenia @ 6.4 oz/A Prowl H2O @ 32 oz/A Applied 21 DAP (V4/7” tall)
  16. Roundup W-Max @ 32 oz/A + Engenia @ 6.4 oz/A + Prowl H20 @ 32 oz/A (Applied 9 DAP, V1/2” tall field corn) CN-08-19 April 16 6 DAT
  17. Roundup W-Max @ 32 oz/A + Engenia @ 6.4 oz/A + Prowl H20 @ 32 oz/A (Applied 21 DAP, V4/7” tall field corn) CN-08-19 April 24 2 DAT
  18. Field Corn Weed Control – 2019 Roundup + Status + Prowl H20 (~$31/A) CN-08-19 May 10 18 DAT NTC Roundup W-Max @ 32 oz/A Status @ 5.0 oz/A Prowl H2O @ 32 oz/A Applied 21 DAP (V4/7” tall)
  19. Field Corn Injury – Status (dicamba) CN-04-16 Agrigold 6659 7 DAT (April 25, 2016) Roundup P-Max @ 32 oz/A + Status @ 5 oz/A Applied 27 DAP V4-V5; 7” tall No yield effect
  20. Field Corn Yield (DKC-6208) As Influenced By Herbicide Treatment CN-08-19, Averaged over 3 timings (V1, V4, and V6), WEEDY Bu/A LSD (0.10) = 13.2 CV = 7.3
  21. Field Corn Weed Control – 2019 Atrazine (PRE) fb Roundup + Acuron (POST) ($31/A) CN-09-19 May 10 10 days after POST NTC Atrazine @ 32 oz/A (PRE) fb Roundup W-Max @ 32 oz/A Acuron @ 48 oz/A Applied 28 DAP (V6/12” tall)
  22. Public Enemy #1 in Field Corn
  23. Lay-By Rig for Morningglory Ponder Farm May 9, 2019
  24. Roundup Powermax II @ 32 oz/A + Evik 80DF @ 2 lbs/A – 36 DAT (June 15, 2018) NTC TREATED 16 GPA 30 PSI 3.7 MPH V7-V8 24” tall FloodJet TK-VS2 7 row middles Treated NTC NTC
  25. Terrell Co. Lay-By - 2019 Roundup + Tricor CN-11-19 May 9 **No difference in weed counts (#/250’) on July 15 (67 DAT)
  26. Post-Harvest Palmer Amaranth Populations Must be Managed!
  27. Palmer Amaranth Burndown - 2019 (AMAPA 1-6” tall) NC-01-19 May 30 10 DAT NTC Gramoxone 3SL @ 32 oz/A Tricor 4L @ 8 oz/A Induce @ 0.25% v/v
  28. Tropical Spiderwort/Benghal Dayflower (TSW/BD) After Corn Harvest (need tillage and/or 2 apps of Gramoxone or 2,4-D or Aim)
  29. Post-Harvest Control of TSW/BD with 2 Applications (14 d apart) of Gramoxone (paraquat) 1 week after POST2
  30. Questions/Comments?