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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. 30,000. 25,000. 20,000. Acres. 15,000. 10,000. - PowerPoint PPT Presentation
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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)