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

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
slide3
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
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

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
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
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
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
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
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