Peanut Response to Warrant (Acetochlor)

E.P. Prostko*, T.L. Grey, and D.L. Jordan

U.S. Planted Acres – 2012(X 1000)

NASSJune 29, 2012

The Peanut Weed Control Toolbox19 active ingredients

• PPI/PRESonalanProwl/PendimaxDual Magnum/GenericsOutlook/PropelPursuitSpartan ChargeSolicamStrongarmValor

• POSTAim (Harvest Aid)Gramoxone

Inteon/Firestorm/ParazoneBasagranUltra BlazerCadre/ImposeClassicCobraPoast/Poast PlusPursuitSelect/Arrow/TriggerStorm2,4-DB

• tested under experimental MON 63410

• capsule suspension formulation (micro-encapsulated)– 3CS

• Acetochlor + safener = Harness or Surpass– First mention in literature was in 1970 (A new selective

herbicide: MON 097, PROC NCWCC 25:56-59)

• Currently labeled for use in cotton, soybeans, field corn, grain sorghum

• MOA = 15– Very long chain fatty acid inhibitor– Same MOA as metolachlor (Dual)

Microencapsulation

small herbicide particles surrounded by polymer shell suspended in carrier

Warrant is not Lasso!!!!

Objective

• To evaluate the tolerance of peanut to various applications of Warrant (acetochlor) under weed-free conditions.

Materials and Methods – IGeneral

• Small-plot techniques• Locations (4)

– Georgia• Ty Ty, Plains

– North Carolina• Rocky Mount,

Lewiston• 4 replications• weed-free• Irrigated• ANOVA

– LSD (0.05)

Materials and Methods – II Locations

Ty Ty Plains Rocky Mount Lewiston

Variety GA-06G GA-06G Champs Champs

Soil Type Tifton sand

Greenville sandy clay

loam

Aycock very fine loamy

sand

Norfolkloamy sand

Planting Date May 9 May 19 May 10 May 2

PPI May 9(rototiller)

May 19(rototiller)

May 2(field cultivator

– 2X, R/B*)

May 2(field cultivator

– 2X, R/B)

PRE May 10 May 19 May 10 May 2

EPOST May 27(18 DAP)

June 1(13 DAP)

May 31(21 DAP)

May 26(24 DAP)

POST June 14(36 DAP)

June 13(25 DAP)

June 15(36 DAP)

June 13(42 DAP)

*R/B = rip and bed

Materials and Methods – IIITreatments

• PPI, PRE, EPOST, POST– Warrant @ 3 or 6 pt/A– Dual Magnum @ 1.33 pt/A

• EPOST– Gramoxone Inteon @ 12

oz/A + Storm @ 16 oz/A + • Warrant @ 3 pt/A or

• Dual Magnum @ 1.33 pt/A

• POST– Cadre @ 4 oz/A +

• Warrant @ 3 pt/A or

• Dual Magnum @ 1.33 pt/A

Results

Influence of PPI Treatments on Peanut Yield (lbs/A)

LSD (0.05)Ponder = 354Plains = NSRocky Mount = 748Lewiston = 864

Influence of PRE Treatments on Peanut Yield (lbs/A)

LSD (0.05)Ponder = 354Plains = NSRocky Mount = 748Lewiston = 864

-7.2%

Influence of EPOST Treatments on Peanut Yield (lbs/A)

LSD (0.05)Ponder = 354Plains = NSRocky Mount = 748Lewiston = 864

Influence of POST Treatments on Peanut Yield (lbs/A)

LSD (0.05)Ponder = 354Plains = NSRocky Mount = 748Lewiston = 864

-7.2%, -8.1%

Influence of EPOST Gramoxone/ Storm on Peanut Yield (lbs/A)

LSD (0.05)Ponder = 354Plains = NSRocky Mount = 748Lewiston = 864

-9.6%

Influence of POST Cadre Treatments on Peanut Yield (lbs/A)

LSD (0.05)Ponder = 354Plains = NSRocky Mount = 748Lewiston = 864

-9.7%

Peanut Response to Warrant @ 6 pt/APPI or PRE

PonderJuly 2577 DAP

NTC PPI PRE*

Peanut Response to Warrant @ 6 pt/AEPOST OR POST

PonderJuly 2577 DAP

NTC EPOST (18 DAP) POST (36 DAP)*

Summary

• No yield loss from any treatment at Plains, Rocky Mount, or Lewiston

• Significant yield loss at Ponder from ……

– Warrant @ 6 pt/A – PRE and POST (7.2-7.4%)

– Dual Magnum @ 1.33 pt/A – POST (8.1%)

– Gramoxone Inteon + Storm + Dual Magnum – EPOST (9.6%)

– Cadre + Warrant (3 pt/A) – POST (9.7%)

Questions?

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