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
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