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 weed control update

2005 Peanut WeedControl Update

Eric P. Prostko

Extension Weed Specialist

Department of Crop & Soil Sciences

The University of Georgia

Tifton


Strip tillage peanuts

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


2005 peanut weed control update

Weeds Sprayed Day of Planting

Weeds Sprayed 2 Weeks Before Planting


Crabgrass control with prowl ec vs prowl h 2 0 in dryland strip till cotton 2004

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

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

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

POST Applied Prowl Injury on Peanut


Peanut yield dp 1 response to prowl application timings

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

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

Pigweed Problems - 2004


Why palmer amaranth

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

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


2005 peanut weed control update

Grady County, GA (2004)


Tsw in georgia

TSW in Georgia

Confirmed in

29 counties by

GA Dept. of Ag

and UGA


Tsw control in peanut

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

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

POST Strongarm Injury - 5 DAT

0.45 ozs/A

Applied 28 DAP

Air Temp - 780

RH - 86%

% Cloud Cover - 20


Metolachlor mysteries

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

Metolachlor Prices

*only labeled for use in field corn and popcorn


Tropical spiderwort response to dual magnum and stalwart grady co 2004 i

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

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

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

What’s wrong with my Cadre?


Cadre in 2004

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 20041

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 20042

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

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 valor good or bad idea

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

Florida Beggarweed Control With Valor (> 56 DAT)

Source: Valent


Cowpea control in peanut 2004

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

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 Rotation Restrictions


Spartan injury

Spartan Injury


Cobra in peanut

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


2005 peanut weed control update

www.gaweed.com


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