Peanut Weed Control Update2010

(County Extension Agents)

Eric P. ProstkoExtension Weed Specialist

Department of Crop & Soil SciencesThe University of Georgia

New Stuff

Fusilade in Peanuts

• Finally Labeled in 2009

• How does it compare to Poast (P) or Select (S)???

• Grass Weeds

– Bermudagrass (F=S>P)– B. signalgrass (P=S>F)– Goosegrass (F=P=S)– TX panicum (P=S>F)– Crabgrass (P=S>F)

• Bristly starbur control?

Fusilade/Bristly Starbur

Source: Dr. Greg MacDonaldUniversity of Florida

Reflex in Peanuts

Peanut Yield Response to Reflex (R) and Valor (V)

4947 5047 4966 5043 49704704

4441

50984860

0

1000

2000

3000

4000

5000

6000

NTC R-16-PPLNT

R-24-PPLNT

R-32-PPLNT

R-16-PRE

R-24-PRE

R-32-PRE

V-3-PRE

V-6-PRE

Treatment

lbs/

A

.

LSD 0.10 = 185PE-08-09Averaged over 3 varieties (GA Green, GA-06G, GA-07W)Weed-free

New Variety Concerns

• GA-06G

• Florida-07

Gramoxone Inteon @ 8.0 oz/A80/20 @ 0.25% v/v7 DAT

FL-07

GA-06G

Gramoxone Inteon @ 8.0 oz/A80/20 @ 0.25% v/v7 DAT

GA-06G FL-07

Classic and GA-06G (2008)

57505390 5536

51385444

0

1000

2000

3000

4000

5000

6000

NTC 61 79 98 110

Time of Application (DAE)

lbs/

A .

0.5 oz/A80/20P = 0.0843LSD 0.10 = 343

*

Classic and GA-06G (2009)

5710

48705084

53885811

0

1000

2000

3000

4000

5000

6000

NTC 63 72 88 105

Time of Application (DAE)

lbs/

A .

0.5 oz/A80/20P = 0.0607LSD 0.10 = 572

*

Classic and FL-07 (2009)

60935795 6009 6193 6312

0

1000

2000

3000

4000

5000

6000

7000

NTC 63 72 88 105

Time of Application (DAE)

lbs/

A .

0.5 oz/A80/20P = 0.0767LSD 0.10 = 297

*

Herbicide/Fungicide Tank-Mixes

Elast

Cadre

Cadre + Elast

• 2009 Field Trial

• Cadre

• Ultra Blazer

• Cobra

• 2,4-DB

• Select Max

• No major problems

• only 1 trial so far

Influence of water volume on peanut injury caused by Provost (10 oz/A) + 2,4-DB (18 oz/A) – 4 DAT

GA-06G (21 DAP)Application Time of Day: 8:30 amAir Temp = 85 FRH = 77%

15 GPA 10 GPA

A Bad Idea!

Headline + Cadre + Strongarm + 2,4-DB + Dyne-Amic

Cobra @ 12.5 oz/A + 1% COC Cobra @ 12.5 oz/A + Provost @ 8 oz/A

Cobra @ 12.5 oz/A + Provost @ 8 oz/A+ 1% COC

1 DAT

Pigweed

Pigweed Control is not impossible!!!!!

Somewhere in SW GeorgiaSeptember 2009

Prostko’s Picks for Pigweed

• Irrigated or Dryland!

• Start Clean!

• Use a residual!

• POST treatments when 3” tall or less

• Remove escapes before seed production

• Think About the Future

May Rainfall – CPES Tifton1996-2009

0

1

2

3

4

5

6

7

Year

Inch

es

.

8 of 14 years (57%) less than average rainfall

May Rainfall – Statesboro1996-2009

0

1

2

3

4

5

6

7

Year

Inch

es

.

9 of 14 years (64%) less than average rainfall

Palmer Amaranth Control with Gramoxone Inteon 2SL @ 2.5 pt/A + 80/20 @ 0.25% v/v

6 hours 4 days

7 days 19 daysAMAPA HeightLow = 8”High = 23”Average = 17”

Palmer amaranth control is not impossible!

NTCProwl H2O @ 34 oz/A – PREValor 51WG @ 3 oz/A – PRE

Cadre 2AS @ 4 oz/A – POST (29 DAP)Agrioil @ 1% v/v – POST (29 DAP)

PE-14-09July 2356 DAP

NTC Gramoxone Inteon 2SL @ 12 oz/AStorm 4SL @ 24 oz/A

80/20 @ 0.25% v/vApplied 21DAP

PE-11-09July 122 DAT

Valor Injury @ (6 oz/A) 16 DAT

PE-05-09May 22, 2009

Peanut Yield Response to Valor - 2009

4947 5098 4860

0

1000

2000

3000

4000

5000

6000

NTC 3 oz/A 6 oz/A

Rate/A

lbs/

A

.

PE-08-09Averaged over 3 varieties (GA Green, GA-06G, GA-07W)Weed-free

LSD 0.10 = 185

Valor 2 oz applied prior to strip tillage Valor 2 oz applied after to strip tillage

Valor Response to Tillage. Macon Co., 2009 at 49 DAT

Ropewick vs. WeedWiperPonder Farm, 2009

****Roller applicator was first mentioned in literature in 1977.Wyse, D.L and C. Habstritt. 1977. A roller herbicide applicator. Proc. North Cent. Weed Control Conf. 32:144-145.

Ropewick vs. WeedWiper – II9 DAT

NTC Ropewick WeedWiper

50% solution of Gramoxone Inteon + 80/20 @ 0.25% v/vAMAPA Height at Application: Low = 28”, High = 62”, Average = 37”

NTC

WeedWiper Test – III7 DAT

Cobra 2EC50% solution

80/20 @ 0.25% v/v

Gramoxone Inteon 2SL50% solution

80/20 @ 0.25% v/v

Pigweed-04-0909/15/09Rep 3

A long-term resistance plan?

Crop PPI/PRE POST1 POST2 MOA’s

Peanut

(No ALS)

DNA + Valor

Cadre 2,4-DB 4

Peanut

(ALS)

DNA Paraquat Basagran +

Dual

Ultra Blazer +

Dual

5

RR-Cotton Reflex Glyphosate + Staple

Direx + MSMA

5

RR-corn Micro-Tech Glyphosate + atrazine

-- 3

RR-soybean

Boundary Glyphosate + FirstRate

-- 4

LL-soybean Dual Magnum

Ignite 2

Cutleaf Eveningprimrose Control21 DAT

2,4-DB 1.75SL @ 16 oz/AAgridex @ 1% v/v99% Visual Control85% Biomass Reduction

Cobra 2EC @ 12.5 oz/AAgridex @ 1% v/v80% Visual Control73% Biomass Reduction

Applied:7” tall11” diameterBud stage

For More Weed Science Info

www.gaweed.com