Peanut Weed Control Update - 2016 Eric P. Prostko, Ph.D. Professor - - PowerPoint PPT Presentation

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Peanut Weed Control Update - 2016 Eric P. Prostko, Ph.D. Professor - - PowerPoint PPT Presentation

Oct 10, 2023 333 likes •640 views

Peanut Weed Control Update - 2016 Eric P. Prostko, Ph.D. Professor and Extension Weed Specialist Department of Crop & Soil Sciences Peanut Weed Control General Thoughts Done by 40-45 DAP Do you really need Gramoxone in Valor

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Peanut Weed Control Update - 2016

Eric P. Prostko, Ph.D. Professor and Extension Weed Specialist Department of Crop & Soil Sciences

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Peanut Weed Control

General Thoughts

  • Done by 40-45 DAP
  • Do you really need

Gramoxone in Valor treated fields under irrigation?

  • Warrant or Dual + Valor at

planting for pigweed?

  • Herbicide resistance or

Farmer resistance? – Too big – too dry - too fast – too high

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Herbicide Sensitive Peanut Growth Stages

R5 R6

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Current Peanut Weed Science Research at UGA

  • Variety Tolerance
  • New Herbicides

– Pyroxasulfone

  • Zidua, Anthem Flex

– Fluridone

  • Brake
  • Nozzle Types
  • Time of Day
  • Fine Tuning Existing

Programs

  • Tank-Mixtures
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Flumioxazin

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Peanut Weed Control – 2015

(Valor-Based Programs)

PE-13-15 August 12 100 DAP NTC

Prowl H20 @ 32 oz/A (PRE) Valor @ 3.0 oz/A (PRE) Strongarm @ 0.225 oz/A (PRE) Cadre @ 4 oz/A – 36 DAP Dual Magnum @ 16 oz/A – 36 DAP 2,4-DB @ 18 oz/A – 36 DAP Prowl H20 @ 32 oz/A (PRE) Valor @ 3.0 oz/A (PRE) Strongarm @ 0.225 oz/A (PRE) Cadre @ 4 oz/A – 36 DAP Warrant @ 48 oz/A – 36 DAP 2,4-DB @ 18 oz/A – 36 DAP

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Peanut Weed Control – 2015

(Paraquat-Based Programs)

PE-13-15 August 12 100 DAP NTC

Prowl H20 @ 32 oz/A – PRE Gramoxone @ 12 oz/A – 17 DAP Storm @ 16 oz/A – 17 DAP Dual Magnum @ 16 oz/A – 17 DAP Cadre @ 4 oz/A – 36 DAP Dual Magnum @ 16 oz/A – 36 DAP 2,4-DB @ 18 oz/A – 36 DAP Prowl H20 @ 32 oz/A – PRE Gramoxone @ 12 oz/A – 17 DAP Storm @ 16 oz/A – 17 DAP Warrant @ 48 oz/A – 17 DAP NIS @ 0.25% v/v – 17 DAP Cadre @ 4 oz/A – 36 DAP Warrant @ 48 oz/A – 36 DAP 2,4-DB @ 18 oz/A – 36 DAP NIS @ 0.25% v/v – 36 DAP

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Cadre (CD), Cobra (CB), 2,4-DB, Dual Magnum (DM), and Warrant (W) Effects on Peanut Yield - III

4908 5429 5023 5323 5165 2000 4000 6000 NTC CD + DM + DB CB + DM + DB CD + W + DB CB + W + DB

PE-14-15 Averaged over 2 timings (31 and 45 DAP) Weed-free

P = 0.4691

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Sicklepod Control in 2015

+ Cadre

  • Cadre

PE-13-15 August 12 100 DAP

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This is what a 3” tall sicklepod looks like!

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AZ1(L) and DC4(R) Response to Cadre @ 4 oz/A + COC @ 1% v/v – 21DAT

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New Peanut Variety Yield Response to POST Herbicides - 2015

Treatment Timing GA-12Y (lb/A) GA-13M (lb/A) NTC

  • 6203

6484 Gramoxone + Storm + Dual Magnum 14 DAP 6471 6143 Cadre + Dual Magnum 37 DAP 6574 6155 Gramoxone + Storm + Dual Magnum Cadre + Dual Magnum 14 DAP 37 DAP 6514 6378 Gramoxone + Storm + Warrant + NIS 14 DAP 6544 6369 Cadre + Warrant + NIS 37 DAP 6538 6559 Gramoxone + Storm + Warrant + NIS Cadre + Warrant + NIS 14 DAP 37 DAP 6284 6369 Gramoxone + Storm + Zidua + NIS 14 DAP 6652 6164 Cadre + Zidua + NIS 37 DAP 6544 6149 Gramoxone + Storm + Zidua + NIS Cadre + Zidua + NIS 14 DAP 37 DAP 6293 6008

P-value 0.1104 0.2189

CV 3.4 4.71 PE-15-15 PE-16-15 Weed-free

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11002DG VMD50 = 322 (C) AIXR 11002 VMD50 = 402 (VC) TTI 02 VMD50 = 524 (EC)

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Nozzle Type Effects on Peanut Weed Control - I

PE-05A-15 July 29 90 DAP

NTC 11002DG 11002 AIXR TTI 02

Prowl H2O @ 32 oz/A (PRE) Gramoxone @ 12 oz/A + Storm @ 16 oz/A + Dual Magnum @ 16 oz/A (15 DAP) Cadre @ 4 oz/A + Dual Magnum @ 16 oz/A + 2,4-DB @ 16 oz/A (42 DAP) 15 GPA 3.0 MPH 20” Boom Height

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Nozzle Type Effects on Peanut Weed Control - II

PE-05B-15 August 3 91 DAP

Prowl H2O @ 32 oz/A (PRE) Gramoxone @ 12 oz/A + Storm @ 16 oz/A + Dual Magnum @ 16 oz/A (23 DAP) Cadre @ 4 oz/A + Dual Magnum @ 16 oz/A + 2,4-DB @ 16 oz/A (36 DAP) 15 GPA 3.0 MPH 20” Boom Height

11002 AIXR

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Nozzle Type Effects on Peanut Weed Control - III

PE-05A-15 July 29 90 DAP

NTC 11002DG

Prowl H2O @ 32 oz/A (PRE) Gramoxone @ 12 oz/A + Storm @ 16 oz/A + Dual Magnum @ 16 oz/A (15 DAP) Cobra @ 12.5 oz/A + Dual Magnum @ 16 oz/A + 2,4-DB @ 16 oz/A (42 DAP) 15 GPA 3.0 MPH 20” Boom Height

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Nozzle Type Effects on Peanut Weed Control - IV

PE-05B-15 August 3 91 DAP

Prowl H2O @ 32 oz/A (PRE) Gramoxone @ 12 oz/A + Storm @ 16 oz/A + Dual Magnum @ 16 oz/A (23 DAP) Cobra @ 12.5 oz/A + Dual Magnum @ 16 oz/A + 2,4-DB @ 16 oz/A (36 DAP) 15 GPA 3.0 MPH 20” Boom Height

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Time of Day Research

  • Afternoon showers

are a problem

  • Hard to see
  • No real benefit
  • Nyctinasty

– Leaves close at night – sicklepod

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Time of Day Effects on Gramoxone (12 oz/A) + Storm (16 oz/A) + Dual Magnum (16 oz/A)

PE-04B-14 June 5 15 DAT 7 am 12 pm 5 pm

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Time of Day Effects on Gramoxone (12 oz/A) + Storm (16 oz/A) + Dual Magnum (16 oz/A)

PE-04B-14 June 5 15 DAT NTC 10 PM

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Time of Day Effects of Gramoxone + Storm + Dual Magnum on Palmer Amaranth Control (14-15 DAT) – 2015

99 98 99 99 94 99 99 98 99 99 99 99 20 40 60 80 100 PE-26 PE-04A PE-04B 7:00 AM 12:00 PM 5:00 PM 10:00 PM

* Not significantly different at any location

15 GPA 11002DG 38-40 PSI 3.5 MPH

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Pay Attention!!!!! 2,4-DB and 2,4-D are not the same thing!!!!

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How much 2,4-DB?

(as of June 29, 2015)

Product Manufacturer Rate/A (oz) Time of Application Total # Applications /Year PHI (days) 2,4-DB 175 Winfield/AgriSolutions 14.4-17.6 2-12 WAPa 2 45 2,4-DB 175 ACETO 16.0-28.0 No later than late bloom (90-100 DAPb) 2 60 2,4-DB 200 Winfield/AgriSolutions 12.8-16.0 2-12 WAP 2 60 2,4-DB 200 ACETO 14.4-25.6 No later than late bloom (90-100 DAPb) 2 60 AgriStar Butyrac 175 Albaugh/AgriStar 14.4-17.6 2-12 WAP 2 45 AgriStar Butyrac 200 Albaugh/AgriStar 12.8-16.0 2-12 WAP 2 45

aWAP = weeks after planting; bDAP = days after planting

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2,4-DB and Peanut Tolerance

  • 2015
  • GA-06G
  • Weed-free
  • 24 oz/A of 2,4-DB

1.75SL + COC @ 1% v/v, applied throughout the season, had no effect on peanut yield or pod size

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2,4-DB Effects on Peanut Yield (GA-06G) – 2015

5993 5916 6051 6054 5891 5934 5611 6062 5833 5996 5357 5879

1300 2600 3900 5200 6500 NTC 31 63 93 123 31 + 63 31 + 93 31 + 123 63 + 93 63 + 123 93 + 123 31 + 63 + 93 lb/A Timing (DAP) PE-06-15

2,4-DB 1.75 SL 24 oz/A 1% COC Weed-free

P = 0.7391 CV = 8.49

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2,4-DB Effects on Peanut Pod Size (GA-06G) – 2015

208 214 214 220 201 211 193 196 202 219 194 211

45 90 135 180 225 NTC 31 63 93 123 31 + 63 31 + 93 31 + 123 63 + 93 63 + 123 93 + 123 31 + 63 + 93 Grams/100 pods Timing (DAP) PE-06-15

2,4-DB 1.75 SL 24 oz/A 1% COC Weed-free

P = 0.3120 CV = 8.23

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Grazon P+D 2.54SL 1/10X rate (2.4 oz/A) – Applied 63 DAP

PE-11-15 August 11 112 DAP

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Grazon P+D 2.54SL Effects on Peanut Yield (lb/A)

4831 5087 4242 4893

1500 3000 4500 6000 2.4 0.24 0.08

Rate (oz/A)

4890 4758 4475 4930

1500 3000 4500 6000 31 63 93

Timing (DAP)

P = 0.4771 P = 0.4355

PE-11-15

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What do the top Georgia peanut growers do?

2014 Georgia Peanut Achievement Club Winners

  • 10 growers
  • 6312 lb/A average yield

– GA State Avg. = 4135 lb/A

  • 10/10 - irrigated
  • 8/10 - bottom plow
  • 10/10 - twin rows
  • Rotations

– peanuts every 3rd or 4th year

  • Herbicides

– 8/10 - Sonalan – 9/10 - Valor – 3/10 - Dual – 8/10 - Cadre – 6/10 - 2,4-DB – 2/10 - Prowl – 3/10 - Strongarm

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Questions? eprostko@uga.edu www.gaweed.com