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Peanut Weed Control for New Agents
AUTHOR
Eric P. Prostko
Professor and Extension Weed Specialist
University of Georgia
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TABLE OF CONTENTS
Peanut Weed Control for New Agents
Peanut Weed Control Tactics
Sicklepod Control (%) in Conventional Tillage Peanut as Influenced by Row Pattern
The Peanut Weed Control Toolbox - 21 Active ingredients
The foundation of weed management in peanuts is the yellow/DNA herbicides!
Strongarm and Valor
Strongarm vs Valor
Valor Injury in Peanut
Valor - Great Weed Control vs. Crop Injury
Valor in Peanuts - The Bottom Line
Strongarm Rotation Restrictions
Paraquat in Peanut
Treatments applied 6 DAC; Photo at 3 DAT
Why do we use Storm or Basagran with paraquat?
Cadre: The glyphosate of peanuts?
Cadre "Yellow Flash" - 3 DAT
Cadre/Impose Rotational Restrictions
Cadre/Cotton
If growers cannot or will not use Cadre...
"Cadre-Free" Weed Control Programs
2,4-DB
2,4-DB Injury
How much 2,4-DB?
What about Dual Magnum?
Dual Magnum vs. Generics Research Summary
Postemergence Grass Control
FL-07, GA Greener, GA-07W = No problems
Cultivation (no weeds are steel-resistant!!!)
Mowing
Non-Selective Applicators
Herbicide/Fungicide Tank-Mixes
Cadre, Headline, Dual Magnum
Headline + Cadre + Strongarm + 2,4-DB + Dyne-Amic
Cadre + 2,4-DB + Stratego + Peg Power + Hook
Palmer Amaranth Control - Integrated Program Approach
Peanut Weed Control 2013 - Prowl/Valor/Strongarm/Cadre/Dual Magnum
Peanut Weed Control 2013 - Prowl/Gramoxone/Storm/Cadre/Dual Magnum
What do the top growers do? 2012 Georgia Peanut Achievement Club Winners
Questions/Comments?
SLIDE CONTENTS
Peanut Weed Control for New Agents Eric P. Prostko, Ph.D. Professor and Extension Weed Specialist Department of Crop & Soil Sciences
Peanut Weed Control Tactics Cultural Practices Planting Date Row spacing Tillage Cover Crops Herbicides Cultivation Mowing Hand-Weeding Twin Row Single Row
Sicklepod Control (%) in Conventional Tillage Peanut as Influenced by Row Pattern Source: Brecke et al. 2006. Weed Technology 20:368-376.
The Peanut Weed Control Toolbox 21 Active ingredients PPI/PRE Sonalan Prowl/Pendimax Dual Magnum/Generics Outlook/Propel Pursuit Spartan Charge Solicam Strongarm Valor POST Aim (Harvest Aid) Gramoxone Inteon/Firestorm/Parazone Basagran Ultra Blazer Cadre/Impose Classic Cobra ET Fusilade Poast/Poast Plus Pursuit Select/Arrow/Trigger Storm 2,4-DB
The foundation of weed management in peanuts is the yellow/DNA herbicides! Sonalan, Prowl, Pendimax, Prowl H2O inexpensive (< $8/A) Texas panicum Florida pusley must be incorporated by tillage or irrigation Flip a coin or personal preference
Valor Injury in Peanut
Valor Great Weed Control vs. Crop Injury
Valor in Peanuts - The Bottom Line Plant at least 1.5” deep and apply within 2 days of planting Injury will occur if heavy rainfall occurs from cracking until ~2 WAC peanut yield should not be reduced if stand is not lost hose and nozzle clean-out very important!!!!! dedicated sprayer for Valor only? except this or do not use it!!!
Strongarm Rotation Restrictions Clearfield canola is not resistant!
Paraquat in Peanut less than $4.00/A if not using Valor or Strongarm apply early alone = before 14 DAC tank-mixes = before 28 DAC tank-mixes with Basagran, Storm, 2,4-D, Dual Tips 15 GPA flat-fan nozzles slower tractor speeds Gramoxone Inteon (2 lb/gal) or Firestorm (3 lb/gal) or Parazone (3lb/gal)
Treatments applied 6 DAC; Photo at 3 DAT GA-02C GI @ 8 oz/A + NIS @ 0.25% v/v GI @ 12 oz/A + Basagran @ 8 oz/A + NIS @ 0.25% v/v
Why do we use Storm or Basagran with paraquat? Improves control of smallflower mg and tropic croton Reduces peanut injury but does not really influence yield (cosmetic) Reduces control of sicklepod, beggarweed, Texas panicum
Cadre: The glyphosate of peanuts? Yellow and purple nutsedge Sicklepod, pigweeds, morningglory, cocklebur Does not control common ragweed, tropic croton, eclipta, spurges, and hophornbeam copperleaf Is it worth the rotational crop risk?? ALS-resistance??? Cadre @ 4 oz/A = $10.94 Impose @ 4 oz/A = $8.59
Cadre “Yellow Flash” – 3 DAT TREATED NTC June 25, 2010 GA-06G
Cadre/Impose Rotational Restrictions
Cadre/Cotton
If growers cannot or will not use Cadre…... weed control costs will probably be higher purple nutsedge will not be controlled Dual Magnum ($10-14/A) but not as effective. Generic metolachlors are cheaper but may not last as long ($5-6/A). Strongarm or Valor Other POST herbicides (Basagran, Blazer, Cobra, Storm) are effective but have some weaknesses and no residual
“Cadre-Free” Weed Control Programs Program 1 Prowl or Sonolan – PPI/PRE Valor (3 oz/A) + Strongarm (0.23 oz/A) – PRE Cobra + Dual Magnum – POST Program 2 Prowl or Sonolan – PPI/PRE Gramoxone + Storm + Dual Magnum – EPOST Cobra + Dual Magnum – POST 2,4-DB as needed in both programs for sicklepod supression
2,4-DB Around for along time Annual mg, cocklebur, sicklepod Usually applied with paraquat or with fungicides Also frequently tank-mixed with Cadre, Cobra, or Ultra Blazer Very inexpensive (<$3.00/A) 1.75 or 2.0 lb/gal formulations
2,4-DB Injury
How much 2,4-DB? aWAP = weeks after planting; bDAP = days after planting
What about Dual Magnum? Weed-free trials conducted in 2010-2012 22/23 comparisons (96%) no negative yield effects PPI, PRE, EPOST, POST, Cadre + Dual
Dual Magnum vs. Generics Research Summary UGA Weed Science Research (11 data sets) 44 individual rating dates (average of 3-4 replications/date) Palmer amaranth and tropical spiderwort data Dual Magnum better than Generics (16/44 = 36.3%) Generics better than Dual Magnum (1/44 = 2.3%) Dual Magnum = Generics (27/44 = 61.4%)
Postemergence Grass Control
FL-07, GA Greener, GA-07W = No problems GA-06G and Tifguard = 7-11% yield losses
Cultivation (no weeds are steel-resistant!!!) Time Diesel fuel prices Strip-tillage Twin rows White mold
Mowing Weed/peanut height differential Digging and harvest aid Flail mower better than rotary mower diesel fuel prices Time???
Non-Selective Applicators
Herbicide/Fungicide Tank-Mixes Possible combinations are endless > 24,000 Avoid 3-way mixes if possible Regional Publication AGW-653 NCSU http://www.peanut.ncsu.edu/PDFFiles/004993/Tank_Mixing_Chemicals_Applied_to_Peanut_Crops.pdf
Cadre @ 1.44 ozs/A Headline @ 9 ozs/A Dual Magnum @ 1.33 pts/A AMS @ 1 lb/A COC @ 1 qt/A
Headline + Cadre + Strongarm + 2,4-DB + Dyne-Amic
Cadre (4 oz/A) + 2,4-DB (24 oz/A) + Stratego (7 oz/A) + Peg Power (16 oz/A) + Hook (0.25% v/v)
Palmer Amaranth Control Integrated Program Approach Tillage Rye Cover Crop Twin Rows Herbicides Hand-Weeding Irrigation
Peanut Weed Control - 2013 Prowl/Valor/Strongarm/Cadre/Dual Magnum PE-01-13 June 25 57 DAP NTC Prowl H20 @ 34 oz/A (PRE) Valor @ 3 oz/A (PRE) Strongarm @ 0.23 oz/A (PRE) Cadre @ 4 oz/A (POST) Dual Magnum @ 16 oz/A (POST)
Peanut Weed Control - 2013 Prowl/Gramoxone/Storm/Cadre/Dual Magnum PE-01-13 June 25 57 DAP NTC Prowl H20 @ 34 oz/A (PRE) Gramoxone @ 12 oz/A (EPOST) Storm @ 16 oz/A (EPOST) Dual Magnum @ 16 oz/A (EPOST) Cadre @ 4 oz/A (POST) Dual Magnum @ 16 oz/A (POST)
What do the top growers do? 2012 Georgia Peanut Achievement Club Winners 10 growers 6204 lbs/A average yield 10/10- irrigated 8/10 – bottom plow 10/10 – twin rows Herbicides 9/10 – Sonalan 10/10 – Valor 3/10 – Dual 9/10 – Cadre 2/10 – 2,4-DB 1/10 – Prowl 2/10 - Strongarm
Questions/Comments? eprostko@uga.edu 229-392-1034 (cell) www.gaweed.com