2005 peanut weed control update
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2005 Peanut Weed Control Update. Eric P. Prostko Extension Weed Specialist Department of Crop & Soil Sciences The University of Georgia Tifton. Strip-Tillage Peanuts. 2,4-D in Feb or March? Burndown 3-4 weeks before planting Prowl Management Rate Time of application EC vs H 2 0

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2005 Peanut Weed Control Update

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2005 Peanut WeedControl Update

Eric P. Prostko

Extension Weed Specialist

Department of Crop & Soil Sciences

The University of Georgia

Tifton


Strip-Tillage Peanuts

  • 2,4-D in Feb or March?

  • Burndown 3-4 weeks before planting

  • Prowl Management

    • Rate

    • Time of application

    • EC vs H20

  • Clean seedbed at planting

  • Plan on using Poast or Select later on

  • Could use Valor


Weeds Sprayed Day of Planting

Weeds Sprayed 2 Weeks Before Planting


Crabgrass Control (%) with Prowl EC vs. Prowl H20 in Dryland, Strip-Till Cotton, 2004

a

a

a

a

a

a

Ratings obtained 9 WAP

1st rainfall event did not occur until 12 DAP (1”)

6 replications (10 rows x 75’)

Prowl 3.3EC @ 2.4 pts/A

Prowl H20 3ACS @ 2.1 pts/A


Florida Pusley Control with Prowl in Strip Tillage – 24 DAP

% control

LSD0.05= 25, nontreated check = 0%


Can I put Prowl over-the-top of a newly emerged peanut?

  • Not a good idea for cotton and soybean

    • Label specifically prohibits POST applications on these crops

  • Overhead irrigation supplemental peanut label

    • at planting or up to 2 days after planting and before crop emergence

  • No data on peanut as far as I know

  • 2004 Research


POST Applied Prowl Injury on Peanut


Peanut Yield (DP-1) Response to Prowl Application Timings

P = 0.198

Averaged over two formulations (Prowl and Prowl H2O applied at 1.00 lb ai/A)


Peanut Yield (DP-1) Response to Prowl Formulations (1.00 lb ai/A)

(2.1 pt/A)

(2.4 pt/A)

P = 0.0541

LSD 0.10 =86

Averaged over five application timings


Pigweed Problems - 2004


Why Palmer Amaranth?

  • grows faster than other pigweeds

  • more competitive than other pigweeds

  • prolific seed producer

    • 1,000,000 seeds/plant

    • 9-12 WAE

    • 2 generations/year

  • herbicide tolerance


Peanut/Pigweed Herbicides

  • residual herbicides

    • DNA’s, Strongarm, Valor, Dual (or generics), Outlook

    • Incorporation methods

  • postemergence

    • GMAX + Storm, Cadre, Pursuit, Blazer, Cobra, Storm

    • Timing, timing, timing


Grady County, GA (2004)


TSW in Georgia

Confirmed in

29 counties by

GA Dept. of Ag

and UGA


TSW Control in Peanut

  • plant in twin rows

  • Gramoxone Max + Dual Magnum + Basagran or Storm – EPOST

  • Cadre, Pursuit, Strongarm* - POST

    • Could add more Dual here

*24c label for POST applications of Strongarm in 2005 (GA only)


Strongarm - POST

  • 24c label in GA

  • tropical spiderwort

    • 1-2 leaf stage

  • 0.45 ozs/A + NIS

  • from cracking up until 30 DAP

  • 18 month cotton/corn rotation


POST Strongarm Injury - 5 DAT

0.45 ozs/A

Applied 28 DAP

Air Temp - 780

RH - 86%

% Cloud Cover - 20


Metolachlor Mysteries?

  • 9 formulations in marketplace

  • new metolachlors (88% s + 12% r)

    • Dual Magnum, Dual II Magnum (Syngenta)

    • Cinch (DuPont)

  • old metolachlors (50% s + 50% r)

    • Stalwart, Stalwart C (Sipcam)

    • Me-Too-Lachlor, Me-Too-Lachlor II (Drexel)

    • Parallel PCS, Parallel (Makhteshim-Agan)


Metolachlor Prices

*only labeled for use in field corn and popcorn


Tropical Spiderwort Response to Dual Magnum and Stalwart, Grady Co., 2004 - I

*

Applied PRE at 1 pt/A.


Tropical Spiderwort Response to Dual Magnum and Stalwart, Grady Co., 2004 - II

*

Applied POST at 1 pt/A with glyphosate to 3” tall COMBE.


For More Information About Spiderwort

  • UGA Extension Circular #884

  • Identification and Control of Tropical Spiderwort in Georgia Field Crops

  • www.gaweed.com


What’s wrong with my Cadre?


Cadre in 2004

PE-09-04

August 3, 2004

60 DAT

Cadre @ 1.44 ozs/A

Agrioil @ 1% v/v

Applied 24 DAP

Untreated


Cadre in 2004

Untreated

Cadre @ 1.44 ozs/A

Agrioil @ 1% v/v

Applied 27 DAP

PE-10-04

August 4, 2004

55 DAT


Cadre in 2004

Untreated

Gramoxone Max @ 5.5 ozs/A

+ Basagran @ 8 ozs/A (14 DAP)

fb

Cadre @ 1.44 ozs/A + 80/20 @

0.25% v/v (29 DAP)

PE-16-04

August 3, 2004


Valor in Peanuts - The Bottom Line

  • Injury will occur if heavy rainfall occurs from cracking until ~2 WAC

  • peanut yield should not be reduced if stand is not lost

  • except this or do not use it

    • repeated complaints may jeopardize label!

  • growers either love it or hate it

    • Dedicated sprayer?

  • hose and nozzle clean-out very important!!!!!

  • Glyphosate was developed as an industrial cleaner!!


Reduced Rates of ValorGood or Bad idea?

  • May reduce injury potential some but

  • Length of FL beggarweed control may be compromised

  • Use of less than 3 ozs/A for beggarweed is below labeled rate thus Valent is not liable


Florida Beggarweed Control With Valor (> 56 DAT)

Source: Valent


Cowpea Control in Peanut - 2004

  • 12 treatments

  • PRE - Spartan, Valor, Strongarm

  • POST - Gramoxone, Blazer, Storm, Cobra, Classic

  • All provided some control early but…..

  • < 70% at 56 DAP

    • Gramoxone Max (8 ozs/A) - 60%

    • Classic (0.5 ozs/A) - 65%


Spartan in Peanut

  • Labeled in 2004

  • 4F formulation

  • 4.8 to 8.0 ozs/A

  • soil-applied

  • broadleaf weed control

  • nutsedge

  • cotton rotation concerns

  • crop injury on lighter soils

  • PPO inhibitor


Spartan Rotation Restrictions


Spartan Injury


Cobra in Peanut

  • Labeled in late Fall 2004

  • postemergence

    • 6 leaf peanut

    • 90 day PHI

  • 12.5 ozs/A

  • broadleaf weed control

    • croton, copperleaf, ragweed, poinsettia, pigweed

  • a hotter Blazer

  • tank-mixes with Basagran, Cadre, Pursuit, Select, 2,4-DB


www.gaweed.com


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