Slide Presentation
TITLE
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2020 Field Corn Update
AUTHOR
Eric P. Prostko
Professor and Extension Weed Specialist
University of Georgia
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TABLE OF CONTENTS
Weed Control in Field Corn 2020
Field Corn Yield Loss (%) Caused by Uncontrolled Weeds in UGA Weed Science Research Trials (2007-2019). Treated vs. Non-treated
Field Corn Weed Contrl Questions for you?
Pigweed Should Not Be a Problem!!!!
A general plan of attack?
Starting Clean
To PRE or Not to PRE?
Anthem Maxx, Dual, Outlook, Warrant, Zidua????
Field Corn Weed Control - 2019 Roundup + Atrazine + Prowl H20 (~$18/A)
Field Corn Weed Control - 2019 Roundup + Laudis + Atrazine (~$18/A)
Field Corn Weed Control - 2019 Halex GT + Atrazine + NIS (~$24/A)
Halex GT + Atrazine + NIS + Fungicides (Trivapro, Headline AMP, Stratego YLD)
Field Corn Weed Control - 2019 Liberty + Atrazine (~$18/A)
Field Corn Weed Control - 2019 Roundup + Impact Z (~$14/A)
Field Corn Weed Control - 2019 Roundup + Engenia + Prowl H20 (~$18/A)
Roundup W-Max @ 32 oz/A + Engenia @ 6.4 oz/A + Prowl H20 @ 32 oz/A (Applied 9 DAP, V1/2" tall field corn)
Roundup W-Max @ 32 oz/A + Engenia @ 6.4 oz/A + Prowl H20 @ 32 oz/A (Applied 21 DAP, V4/7" tall field corn)
Field Corn Weed Control - 2019 Roundup + Status + Prowl H20 (~$31/A)
Field Corn Injury - Status (dicamba)
Field Corn Yield (DKC-6208) As Influenced By Herbicide Treatment
Field Corn Weed Control - 2019 Atrazine (PRE) fb Roundup + Acuron (POST) ($31/A)
Public Enemy #1 in Field Corn
Lay-By Rig for Morningglory
Roundup Powermax II @ 32 oz/A + Evik 80DF @ 2 lbs/A - 36 DAT (June 15, 2018)
Terrell Co. Lay-By - 2019 Roundup + Tricor
Post-Harvest Palmer Amaranth Populations Must be Managed!
Palmer Amaranth Burndown - 2019 (AMAPA 1-6" tall)
Tropical Spiderwort/Benghal Dayflower (TSW/BD) After Corn Harvest
Post-Harvest Control of TSW/BD with 2 Applications (14 d apart) of Gramoxone (paraquat)
Questions/Comments?
SLIDE CONTENTS
Eric P. Prostko, Ph.D. Professor/Extension Weed Specialist Dept. Crop & Soil Sciences Weed Control in Field Corn 2020
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
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?
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 POSTs
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?
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
To PRE or Not to PRE?
Anthem Maxx, Dual, Outlook, Warrant, Zidua????
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)
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)
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)
Halex GT + Atrazine + NIS + Fungicides (Trivapro, Headline AMP, Stratego YLD) CN-07-19 DKC6208 May 3 9 DAT
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)
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)
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)
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
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
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)
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
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
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)
Public Enemy #1 in Field Corn
Lay-By Rig for Morningglory Ponder Farm May 9, 2019
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
Terrell Co. Lay-By - 2019 Roundup + Tricor CN-11-19 May 9 **No difference in weed counts (#/250) on July 15 (67 DAT)
Post-Harvest Palmer Amaranth Populations Must be Managed!
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
Tropical Spiderwort/Benghal Dayflower (TSW/BD) After Corn Harvest (need tillage and/or 2 apps of Gramoxone or 2,4-D or Aim)
Post-Harvest Control of TSW/BD with 2 Applications (14 d apart) of Gramoxone (paraquat) 1 week after POST2
Questions/Comments?