Peanut Weed Control Update - 2011(County Extension Agents)

Eric P. ProstkoProfessor and Extension Weed Specialist

Department of Crop & Soil SciencesThe University of Georgia

Topics for Discussion

• Cadre Carryover• Palmer Control• Classic Update• Gramoxone Update• Changes in 2012

Pest Control Rec’s Charge

• New Stuff• New Publication• Future Concerns

Cotton/Cadre Carryover ProblemsWorse in 2011?

**18.59” deficit rainfall

What about 2012?Rainfall (in): June 1 – Nov 30Tifton Campus Conference Center

Month

in

Cotton/Cadre Carryover ProblemsWorse in 2011?

**9.76” deficit rainfall

What about 2012?Rainfall (in): June 1 – Nov 30Statesboro

Month

in

Cadre/Impose Rotational Restrictions

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 + 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 Sonalan – PPI/PRE

– Valor (3 oz/A) + Strongarm (0.23 oz/A) – PRE

– Cobra or Ultra Blazer + Dual Magnum – POST

• Program 2

– Prowl or Sonalan – PPI/PRE

– Gramoxone + Storm + Dual Magnum – EPOST

– Cobra or Ultra Blazer + Dual Magnum – POST

• 2,4-DB as needed in both programs for sicklepod. Will likely need 2 applications.

What one man can do, so can another!Sumter County - June 28, 2011(Prowl + Valor fb Cadre)

Pigweed Control is not impossible!!!!

Common Reasons for Failure:1) did not start clean2) did not use a residual3) residual did not get activated4) POST applications are too late5) short arms and deep pockets

Palmer Amaranth Control in PeanutValor Program

PE-26-11August 25108 DAP

NTC Prowl H20 3.8SC @ 32 oz/A (PRE)Valor 51WG @ 3 oz/A (PRE)Cadre 2AS @ 4 oz/A (POST)

COC @ 1% v/v (POST)

Palmer Amaranth Control in PeanutDual (metolachlor) Program

Prowl H20 @ 34 oz/A (2 DAP)Gramoxone Inteon @ 12 oz/A (21 DAP)

Storm @ 16 oz/A (21 DAP)Dual Magnum @ 16 oz/A (21 DAP)

Cadre @ 4 oz/A (37 DAP)Dual Magnum @ 16 oz/A (37 DAP)

PE16B-11Sept 2116 DAP

NTC

FL-07, GA Greener = No problems

GA-06G and Tifguard = 7-11% yield losses

Peanut Yield Response (lbs/A) to Classic @ 0.5 oz/A (2008-2011)

Time of Application

(DAEb)

Cultivara

Florida-07c Georgia-06G Tifguard

NTC 6321 a 5736 a 5700 a

60-69 6251 a 5130 c 5313 ab

70-79 6150 a 5310 bc 5200 b

90-99 6395 a 5263 bc 5101 b

100+ 6378 a 5627 ab 5097 baMeans are averaged over 2 site-years.bDAE = days after peanut emergence.cMeans in the same column with the same letter are not significantly different according to Fisher’s Protected LSD Test (P = 0.10).

**When significant, yield losses ranged between 7 to 11%

Georgia Greener Yield Response to Classic (0.5 oz/A): 2011-2012

Time of Application (DAE) 2011 2012

0 6187

60-69 5195

70-79 5632

90-99 5591

100+ 5773

LSD 0.10CV

NS13

DAE = Days After Peanut Emergence

A New Formulation of Paraquat from Syngenta

Treatments applied 6 DAC; Photo at 3 DATGA-02C

GI @ 8 oz/A +NIS @ 0.25% v/v

GI @ 12 oz/A + Basagran @ 8 oz/A +NIS @ 0.25% v/v

The influence of paraquat on peanut yield (lbs/A)1.

HerbicideHerbicide22 Rate/Rate/AA

GA-06G FL-07 Tifguard

20082008 20092009 20092009 20102010 20102010 20112011

None -- 5210 5741 5932 5737 5677 3215

Gramoxone Inteon 2SL +

NIS

8 oz +0.25%

v/v

5069 5311(-7.5%)

5737(-3.3%)

5453 5388 2995

Gramoxone Inteon 2SL +

Basagran 4SC +

NIS

12 oz + 8 oz

+ 0.25%

v/v

5082 5653 5843 5545 5646 3196

LSD (0.10) NS 265 110 NS NS NS1Weed-free conditions.2Pooled over four application timings (7, 14, 21, and 28 DAC)

2012 Peanut Pest Control RecChanges

Spartan Charge 3.5L

• FMC• Sulfentrazone (Spartan) @

3.15 lb/gal + carfentrazone (Aim) @ 0.35 lb/gal

• PRE @ 3-4 oz/A• Tank-mix with Prowl or Dual• Not on sands with less

than 1% OM• Rotation Restrictions: canola

= 24 months; field corn = 4 months; cotton = 12 months**; small grains = 4 months; sorghum = 10 months; soybeans = anytime; sunflowers = anytime; tobacco = anytime.

• Same MOA as Valor (PPO)• ** some UGA research

suggests that the crop rotation restriction for cotton should be 18 months.

Palmer Amaranth Control in PeanutValor vs. Spartan Charge

PE-26-11August 25108 DAP

NTC Prowl H20 3.8SC @ 32 oz/A (PRE)Valor 51WG @ 3 oz/A (PRE)Cadre 2AS @ 4 oz/A (POST)

COC @ 1% v/v (POST)

Prowl H20 3.8SC @ 32 oz/A (PRE)Spartan Charge 3.5L @ 4 oz/A (PRE)

Cadre 2AS @ 4 oz/A (POST)COC @ 1% v/v (POST)

Sulfentrazone Injury on PeanutHigh rates, lighter soils

Potential New Herbicides?

Valor + Pyroxasulfone

Pyroxasulfone

Micro-encapsulated acetochlor

Weed Control in Peanut with Warrant Systems

PE-21-11July 1964 DAP

NTCProwl H20 @ 34 oz/A (2 DAP)

Gramoxone Inteon @ 12 oz/A (21 DAP)Storm @ 16 oz/A (21 DAP)

Warrant @ 48 oz/A (21 DAP)Cadre @ 4 oz/A (37 DAP)

Warrant @ 48 oz/A (37 DAP)

Prowl H20 @ 34 oz/A (2 DAP)Gramoxone Inteon @ 12 oz/A (21 DAP)

Storm @ 16 oz/A (21 DAP)Dual Magnum @ 16 oz/A (21 DAP)

Cadre @ 4 oz/A (37 DAP)Dual Magnum @ 16 oz/A (37 DAP)

Palmer Amaranth Control in Peanut with Fierce

PE-24-11July 2981 DAP

NTC Fierce 76WG @ 3 oz/A (PRE)

Weed Control in Peanut with Pyroxasulfone

PE-16B-11July 1964 DAP

NTC Pyroxasulfone 85WG @ 1.5 oz/A (2 DAP)Strongarm @ 0.23 oz/A (2 DAP)

Valor @ 3 oz/A (2 DAP)Cadre @ 4 oz/A (37 DAP)

80/20 @ 0.25% v/v (37 DAP)

New Publication“Peanut Response to Glyphosate”

• UGA Circular 1007• September 2011

http://www.caes.uga.edu/applications/publications/files/pdf/C%201007_1.PDF

Future Concerns/Issues

• Abuse of Ignite

• Increased use of Dual Magnum and Warrant

• Increased use of PPO herbicides– Valor and Reflex

Thanks for Listening!

• eprostko@uga.edu• 229-392-1034 (cell)• www.gaweed.com

Eric P. Prostko (office)Eric Prostko - laptop