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Peanut Weed Control Update
2002 UGA Extension Agent
Training
Eric P. Prostko
Extension Weed Specialist
Tifton
Topics for Discussion
• Valor Problems
• Ultra Blazer Injury
• Classic Concerns
• “herbicides on the horizon”
• 2002 Research
Peanut Acres Treated with Valor and Injury by Region in 2001
0
5,000
10,000
15,000
20,000
25,000
30,000
Atlantic Southeast Oklahoma Texas
Acr
es
Acres Treated Acres Injured
Source: Valent USA Corp.Source: Valent USA Corp.
Valor Injury
Valor Performance
Valor No Valor
Irwin Co, 2001
Peanut Yield As Influenced By PRE Herbicides - 2000
5767 57695456
5838
0
1500
3000
4500
6000
Untreated Strongarm Valor Spartan
Herbicide
lbs/
A
Averaged over 2 varieties (GA Green, C99R) * LSD (0.05) = 561 Lang Farm
Valor Timing Tests - 2002
• 5 locations
• small plot techniques
• Valor (3 oz/A) applied 0 to 10 DAP
• weed-free conditions
• crop injury, yield, maturity
Peanut Yield in Response to Valor Timings
4673
39604221
36803394
2496
1567
0
1000
2000
3000
4000
5000
Untrea
ted
0 DAP
1 DAP
3 DAP
5 DAP
7 DAP
10 D
AP
Valor Timing
lbs/
A
GA GreenTifton, GA 2001
aabc ab bc
c
d
e
Peanut Yield in Response to Valor Timings
4526 4552 44084580
41884459
0
1000
2000
3000
4000
5000
0 DAP 2 DAP 4 DAP 6 DAP 8 DAP 10 DAP
Valor Timing
lbs/
A
C-99RAttapulgus, GA 2001 P = 0.66
Peanut Yield in Response to Valor Timings
3704 38034027 3881 3939
42973789
0
1000
2000
3000
4000
5000
Untrea
ted
0 DAP
1 DAP
3 DAP
5 DAP
7 DAP
10 D
AP
Valor Timing
lbs/
A
NC 12CLewiston, NC 2001 P = 0.56
Peanut Yield in Response to Valor Timings
68756301
6564 6723 67316476
0
1000
2000
3000
4000
5000
6000
7000
Untreated 0 DAP 2 DAP 4 DAP 6 DAP 8 DAP
Valor Timing
lbs/
A
GA GreenCitra, FL 2001 P = 0.31
Peanut Yield in Response to Valor Timings
3394
41204483
4109 39643616
3234
0
1000
2000
3000
4000
5000
Untrea
ted
0 DAP
1 DAP
3 DAP
5 DAP
7 DAP
10 D
AP
Valor Timing
lbs/
A
GA GreenYoakum, TX 2001 P = 0.48
Valor in Peanuts - 2002Suggestions
• calibration
• pre-slurry
• plant 1.5” deep
• apply at planting
• do not irrigate when cracking
• hull scrape
• limited acreage
Ultra Blazer in Peanuts
• new formulation
• G-E control of croton, ragweed, mg, pigweed, etc
• Concerns
* crop injury
* yield loss???
Peanut Yields As Influenced By Ultra Blazer Applications - 2001
(1.5 pts/A + COC 1% v/v)
5265 5649 53304883 4758
54154533
5491
0
1300
2600
3900
5200
6500
Untreat
ed
30 D
AP
45 D
AP
60 D
AP
74 D
AP
88 D
AP
120 D
AP
30 +
88 D
AP
Timing
lbs/
A
Averaged over 2 varieties (GA Green, C99R)*LSD (0.05) = 311+LSD (0.10) = 260 Ponder Farm
Peanut Yields As Influenced By Ultra Blazer Applications - 2001
(1.5 pts/A + COC 1% v/v)
52395704 5470 5631
48425241
5696
0
1300
2600
3900
5200
6500
Untreat
ed
30 D
AP
42 D
AP
55 D
AP
82 D
AP
90 D
AP
30 +
90 D
AP
Timing
lbs/
A
Averaged over 2 varieties (GA Green, C99R)*LSD (0.05) = NS+LSD (0.10) = 534 Plains, GA
4112
5139
4457 45294868
4136 3947
0
1000
2000
3000
4000
5000
6000
Untrea
ted
23 D
AP
36 D
AP
51 D
AP
65 D
AP
79 D
AP
99 D
AP
Timing
Yie
ld (
lbs/
A)
Peanut Yields as Influenced by Ultra Blazer Applications - 2001
(1 qt/A + Induce 0.25% v/v)
Averaged over 2 varieties (GA Green, C99R)P = 0.20 Jay, FL
Ultra Blazer in Peanuts
• small weeds
• before 65 DAP
• surfactant
• 0.5-1.5 pts/A
Classic Issues in Peanut
• 20-25% of acreage
• late-season beggarweed
• tolerance of new varieties
• influence on TSWV
Does Classic have an influence on TSWV in peanut?
• Studies conducted in 2000-2001 indicate…..
• Classic can increase TSWV but not always.
• Classic/TSWV interaction can reduce yields but not always.
• Earlier applications??
TSWV as Influenced by Classic Applications (2000-2001)
-15
-10
-5
0
5
10
15
20
0 20 40 60 80 100
Classic Timing (DAE)
Cha
nge
in T
SWV
(%
)
4 trials conducted in GAAveraged over 2 varieties (GA Green and C-99R)
Peanut Yield as Influenced by Classic Applications (2000-2001)
-1500
-1300
-1100
-900
-700
-500
-300
-100
100
300
0 20 40 60 80 100
Classic Timing (DAE)
Cha
nge
in Y
ield
(lb
s/A
)
2 trials conducted in GA/1 trial conducted in FLAveraged over 2 varieties (GA Green and C-99R)weed-free conditions
“Herbicides on the Horizon”??
• Spartan (FMC)
* broadleaf/y. nutsedge
* crop injury concerns
* cotton rotations• Callisto (Syngenta)
* preemergence
* broadleaf weeds
* early development
2002 Research Focus
• tropic croton control (Cadre tank-mixes)
• dayflower/spiderwort control
• herbicide/fungicide tank-mixes
• reduced rates of Strongarm + Valor
• Classic/TSWV
• others???
University ofGeorgia
ExtensionWeed Science
(gaweed.com)