Slide Presentation
TITLE
(click title to view slides)
2025 Peanut Weed Control Update
AUTHOR
Eric P. Prostko
Professor and Extension Weed Specialist
University of Georgia
DOWNLOAD PRESENTATION
(right click and select 'Save Target As...')
PowerPoint - 16.8 MB
PDF - 10.2 MB
TABLE OF CONTENTS
2025 Peanut Weed Control Update
2024 Problems
2,4-D LV4 @ 16 oz/A Applied at 45 DAP
2,4-D (not 2,4-DB) on Peanut
Gramoxone 3SL @ ~8-16 oz/A (70-80 DAP)
Atrazine 4L @ 12 oz/A ~90 DAP
Roundup Drift on Peanut From Drone (3 qt/A + COC @ 3 GPA)
Roundup/Peanut
Gunslinger AMP (aminopyralid + 2,4-D) Sprayer Contamination (24 oz/A applied to pasture then rinsed out)
Gunslinger AMP (aminopyralid + 2,4-D) Sprayer Contamination (24 oz/A applied to pasture then rinsed out)
Numerical Peanut Yield Loss (%) from "Non-Peanut" Herbicides Applied at 1/10X Rates at Different Times in Georgia
Gunslinger AMP Sprayer Cleanout
Cadre "Yellow Flash" - 3 DAT
Yellow Nutsedge Control with Cadre @ 4 oz/A + Agridex @ 1% v/v - 2019
Cadre Not Working on Yellow Nutsedge Anymore?
Cadre (imazapic) Resistant Yellow Nutsedge - 28 DAT
Yellow Nutsedge/Cadre Samples-2024
Yellow Nutsedge Control with Broadloom (bentazon) - 2019
Yellow Nutsedge Control with Split Shot of Basagran (32 oz/A) + Crop Oil (1% v/v) - Field was previously treated with Cadre @ ~40 DAP.
Dicamba Preplant? NO, NO, NO!!!!
Dicamba Preplant in Peanut (Not Labeled, need at least 28 D + 1" rainfall/irrigation)
Do What?
Peanut/pH/Zinc
Peanut/pH/Zn
Peanut Weed Control Programs
Herbicide Use in Georgia Peanuts (2018 and 2023)
Peanut Weed Control - 2024
Peanut Weed Control - 2024
WSSA Group 15 Herbicides?
Storm vs. "Georgia" Storm - 2024
Peanut Weed Control - 2024
Valor Injury - 2019
Valor Effects on Peanut Yield High Moisture Conditions - 2019
Valor causes injury but what about weed control?
Peanut Yield as Influenced By Valor 50WG (3 oz/A) Timing
New Stuff
Generic Strongarm?
Peanut Weed Control - 2024
Brake Injury - 2024 (Grower Field)
Brake Label Issues
2024 Brake/Rexovor Timing Study
Brake/Rexovor Timing - 2024
Peanut (GA-06G) Yield Response to Brake Timing (2022-2024)
Pendimethalin Formulations
Weed Control in Peanut with Different Pendimethalin Formulations - 2024
Enversa™
Weed Control in Peanut - 2024 - Warrant 3ME & Enversa 3ME
Weed Control in Peanut - 2024
What do the top Georgia peanut growers do? 2023 Georgia Peanut Achievement Club Winners
Questions/Comments
SLIDE CONTENTS
2025 Peanut Weed Control Update Eric P. Prostko Extension Weed Specialist Dept. Crop & Soil Sciences
2024 Problems
2,4-D LV4 @ 16 oz/A Applied at 45 DAP Cadre 2,4-DB Class Act NG Cadre 2,4-D LV4 Class Act NG 13% yield loss??
2,4-D (not 2,4-DB) on Peanut
Gramoxone 3SL @ ~8-16 oz/A (70-80 DAP) No Negative Yield Effects
Atrazine 4L @ 12 oz/A ~90 DAP ~ 4500 NTC ~2500 treated 44% yield loss
Roundup Drift on Peanut From Drone (3 qt/A + COC @ 3 GPA)
Roundup/Peanut
Gunslinger AMP (aminopyralid + 2,4-D) Sprayer Contamination (24 oz/A applied to pasture then rinsed out) July 22, 2024 21 DAT GA-12Y 60 DAP
Gunslinger AMP (aminopyralid + 2,4-D) Sprayer Contamination (24 oz/A applied to pasture then rinsed out) August 20, 2024 50 DAT GA-12Y 60 DAP NTC Treated Final Story Treated = 5000 lbs/A (-8%) 68-72 grade Non-Treated = 5400 lbs/A 1/100X rate based on 2024 data
Numerical Peanut Yield Loss (%) from “Non-Peanut” Herbicides Applied at 1/10X Rates at Different Times in Georgia
Gunslinger AMP Sprayer Cleanout
Cadre “Yellow Flash” – 3 DAT TREATED NTC June 25, 2010 GA-06G
Yellow Nutsedge Control with Cadre @ 4 oz/A + Agridex @ 1% v/v - 2019 PE-17-19 Applied May 22 6-12” at application May 31 9 DAT June 3 12 DAT June 12 21 DAT June 24 33 DAT July 16 55 DAT
Cadre Not Working on Yellow Nutsedge Anymore? PE-16-23 August 29 120 DAP Prowl H20 @ 32 oz/A Valor EZ @ 3 oz/A Strongarm @ 0.225 oz/A (PRE) Cadre @ 4 oz/A Warrant @ 48 oz/A Butyrac @ 16 oz/A Agridex @ 1% v/v (34 DAP) Prowl H20 @ 32 oz/A Valor EZ @ 3 oz/A Strongarm @ 0.225 oz/A (PRE) Cadre @ 4 oz/A Enversa @ 48 oz/A Butyrac @ 16 oz/A Agridex @ 1% v/v (34 DAP) Prowl H20 @ 32 oz/A Valor EZ @ 3 oz/A Strongarm @ 0.225 oz/A (PRE) Cobra @ 12.5 oz/A Warrant @ 48 oz/A Butyrac @ 16 oz/A Agridex @ 1% v/v (34 DAP)
Cadre (imazapic) Resistant Yellow Nutsedge – 28 DAT Sensitive Resistant Cadre 2AS @ 4 oz/A (0.07 kg ai/ha)
Yellow Nutsedge/Cadre Samples-2024
Yellow Nutsedge Control with Broadloom (bentazon) - 2019 NC-04-19 August 7 13 days after POST2 NTC Broadloom 4SL @ 32 oz/A Agridex @ 1% v/v 2 POST applications 10 days apart
Yellow Nutsedge Control with Split Shot of Basagran (32 oz/A) + Crop Oil (1% v/v) – Field was previously treated with Cadre @ ~40 DAP. (Basagran + COC was applied August 30 then September 10) Berrien Co. (2024) 08/27/24 - Before 09/17/24 - After
Dicamba Preplant? NO, NO, NO!!!! C. Jones Birdsong Peanuts June 2024
Dicamba Preplant in Peanut (Not Labeled, need at least 28 D + 1” rainfall/irrigation) W. Briggs 06/14/24
Do What? Prowl @ 16 oz/A ($5.88) Brake @ 16 oz/A ($23.23) Dual @ 16 oz/A ($8.88) Liberty @ 32 oz/A ($6.00) Clethodim @ 16 oz/A ($6.88) Zaltus @ 1.5 oz/A ($3.47) Strongarm @ 0.45 oz/A ($20.18) Roundup @ 24 oz/A ($4.03) Crop Oil @ 12.8 oz/A ($2.00) Total Cost/A = ~$80.55 C.A. Abbott SePro May 8, 2024 VA Grower
Peanut/pH/Zinc Examples: Waters: 1) Good: pH = 6.2, Zn = 8.4 lbs/A; Bad: pH = 5.4, Zn = 5.8 lbs/A Riden: 1) Good: pH = 5.9, Zn = 9.9 lbs/A; Bad: pH = 5.0, Zn = 5.0 lbs/A Berrien Co. 2024
Peanut/pH/Zn Good: pH = 5.8; Zn = 3 lbs/A Bad: pH = 4.6; Zn = 108 lbs/A Burke Co. July 2024
Peanut Weed Control Programs
Herbicide Use in Georgia Peanuts (2018 and 2023) Sources: USDA/NASS: 2018 Agrichemical Use Survey-Peanut, May 2019, No. 2019-2; 2023 Agrichemical Use Survey-Peanut, May 2024, No. 2024-3.
Peanut Weed Control - 2024 PE-07-24 July 22 83 DAP NTC Prowl H20 3.8SC @ 32 oz/A Valor EZ 4SC @ 3 oz/A Strongarm 84WG @ 0.225 oz/A PRE (1 DAP) Cadre 2AS @ 4 oz/A Butyrac 200 2SL @ 16 oz/A Dual Magnum 7.62EC @ 16 oz/A POST (34 DAP) Sonalan 3EC @ 32 oz/A Valor EZ 4SC @ 3 oz/A Strongarm 84WG @ 0.225 oz/A PRE (1 DAP) Cadre 2AS @ 4 oz/A Butyrac 200 2SL @ 16 oz/A Dual Magnum 7.62EC @ 16 oz/A POST (34 DAP)xxx 4646 lbs/A 4681 lbs/A
Peanut Weed Control - 2024 PE-18-24 July 22 82 DAP Gramoxone 3SL @ 8 oz/A Basagran 5L @ 6.4 oz/A Dual Magnum 7.62EC @ 16 oz/A EPOST (12 DAP) Cadre 2AS @ 4 oz/A Butyrac 200 2SL @ 16 oz/A Dual Magnum 7.62EC @ 16 oz/A POST (34 DAP) Gramoxone 3SL @ 8 oz/A Bastante 4SL @ 8 oz/A Dual Magnum 7.62EC @ 16 oz/A EPOST (12 DAP) Actylis (imazapic) 2AS @ 4 oz/A Actylis (2,4-DB) 2SL @ 16 oz/A Dual Magnum 7.62EC @ 16 oz/A POST (34 DAP) NTC 4024 lbs/A 4123 lbs/A
WSSA Group 15 Herbicides?
Storm vs. “Georgia” Storm - 2024 PE-10-24 June 3 21 DAT NTC Gramoxone 3SL @ 8 oz/A Storm 4SL @ 16 oz/A Dual Magnum 7.62EC @ 16 oz/A Gramoxone 3SL @ 8 oz/A Ultra Blazer 2LC @ 16 oz/A Broadloom 4LC @ 8 oz/A Dual Magnum 7.62EC @ 16 oz/A
Peanut Weed Control - 2024 Cadre/Ultra Blazer/Cobra/2,4-DB/Dual Magnum Tank-Mixes (15 GPA, AIXR11002 Tips) PE-20-24 July 22 61 DAT NTC Cadre 2AS @ 4 oz/A Butyrac 200 2SL @ 16 oz/A Dual Magnum 7.62EC @ 16 oz/A Cadre 2AS @ 4 oz/A Cobra 2EC @ 12.5 oz/A Butyrac 200 2SL @ 16 oz/A Dual Magnum 7.62EC @ 16 oz/A Cadre 2AS @ 4 oz/A Ultra Blazer 2SL @ 24 oz/A Butyrac 200 2SL @ 16 oz/A Dual Magnum 7.62EC @ 16 oz/A
Valor Injury - 2019 PE-07-19 May 14 13 DAP NTC 3 oz/A 6 oz/A
Valor Effects on Peanut Yield High Moisture Conditions - 2019 PE-07-19 - Weed-free - 8.3” rainfall/irrigation first 30 DAP P = 0.7798 CV = 10.6 *averaged over 4 Dual Magnum rates lbs/A
Valor causes injury but what about weed control? Dryland Valor + Prowl Timely rain after application Old Age or “Natties” D. Hall June 4, 2024
Peanut Yield as Influenced By Valor 50WG (3 oz/A) Timing (Only Valor + Water was Applied at Listed Timings) PE-16-01 GA Green Planted May 8, 2001 lbs/A LSD 0.05 = 729 CV = 14.33 Time (DAP) “True Crack” 2” tall 3 leaf 21%-67% yield loss! Prowl PPI @ 2.4 ptA Irrigation: 1 DAP = 0.50” irrigation 8 DAP = 0.65” irrigation 13 DAP = 0.50” irrigation Historic Rainfall Avg. (May 8-29) 21 DAP 2.44”
New Stuff Where’s Bob?
Generic Strongarm? Aceto/Actylis Only 2 years of field data? 25 years with Strongarm Cheaper than brand name? No problems thus far. Label has expanded POST section.
Peanut Weed Control - 2024 PE-18-24 July 22 82 DAP NTC Sonalan 3EC @ 32 oz/A Valor EZ @ 4SC @ 3 oz/A Strongarm 84WG @ 0.225 oz/A PRE Cadre 2AS @ 4oz/A Butyrac 200 2SL @ 16 oz/A Dual Magnum 7.62EC @ 16 oz/A POST (34 DAP) Actylis (ethalfluralin) 3EC @ 32 oz/A Valor EZ @ 4SC @ 3 oz/A Diclom 84WG @ 0.225 oz/A PRE Actylis (imazapic) 2AS @ 4oz/A Actylis (2,4-DB) 2SL @ 16 oz/A Dual Magnum 7.62EC @ 16 oz/A POST (34 DAP) 4215 lbs/A 4271 lbs/A
Brake Injury – 2024 (Grower Field) GA-18RU (Planted April 25); Brake @ 12 oz/A + Dual Magnum @ 22 oz/A (April 27) T. Price Cook Co. May 17
Brake Label Issues “Apply prior to planting or within 36 hours after planting” Equipment issues? Weather?
2024 Brake/Rexovor Timing Study PE-02-24 1 DAP 3 DAP 5 DAP 7 DAP
Brake/Rexovor Timing – 2024 Brake 1.2SC @ 12 oz/A PE-08-24 May 13 12 DAP NTC 5 DAP 7 DAP
Peanut (GA-06G) Yield Response to Brake Timing (2022-2024) P = 0.63 Yield (lbs/A)
Pendimethalin Formulations Pendalin H20
Weed Control in Peanut with Different Pendimethalin Formulations - 2024 PE-01-24 June 11 41 DAT NTC Prowl H20 3.8SC @ 32 oz/A Valor EZ 4SC @ 3 oz/A Strongarm 84WG @ 0.225 oz/A PRE Pendalin H20 3.8SC @ 32 oz/A Valor EZ 4SC @ 3 oz/A Strongarm 84WG @ 0.225 oz/A PRE Satellite Hydrocap 3.8SC @ 32 oz/A Valor EZ 4SC @ 3 oz/A Strongarm 84WG @ 0.225 oz/A PRE
Enversa™ Corteva Ecapsulated acetochlor Similar to but NOT the same as Warrant Moisture activation issues? Delay irrigation for 48 hours Only 1 year of data for me
Weed Control in Peanut - 2024 PE-16-24 June 14 44 DAP NTC Warrant 3ME @ 48 oz/A PRE Enversa 3ME @ 48 oz/A PRE 0 DAT = 0.5” I 2 DAT = 0.9” R 7 DAT = 0.75”R 8 DAT = 0.75” R 11 DAT = 1.1” R
Weed Control in Peanut - 2024 PE-16-24 July 22 82 DAP NTC Prowl H20 3.8SC @ 32 oz/A Valor EZ 4SC @ 3 oz/A PRE Cadre 2AS @ 4 oz/A Butyrac 200 2SL @ 16 oz/A Warrant 3ME @ 48 oz/A Agridex @ 1% v/v POST (34 DAP) Prowl H20 3.8SC @ 32 oz/A Valor EZ 4SC @ 3 oz/A PRE Cadre 2AS @ 4 oz/A Butyrac 200 2SL @ 16 oz/A Enversa 3ME @ 48 oz/A Agridex @ 1% v/v POST (34 DAP)
What do the top Georgia peanut growers do? 2023 Georgia Peanut Achievement Club Winners 16 growers 142 to 1473 acres (range) ~520 acres (average) 5734 lb/A average yield 4630-6357 lbs/A (range) 2023 GA State Avg. = 4080 lb/A 100% - irrigated 56% - bottom plow 75% - twin rows Herbicides 40% - Sonalan 93% - Valor 53% - Dual 73% - Cadre 47% - 2,4-DB 33% - Prowl 33% - Strongarm 13% - Zidua 13% - paraquat 20% - Storm
Questions/Comments