a comparison of full and reduced rate weed management programs in peanut
DESCRIPTION
A Comparison of Full and Reduced Rate Weed Management Programs in Peanut. E.P. Prostko and T. L. Grey Dept. of Crop & Soil Sciences University of Georgia Tifton. SWSS 2004. The Need for Cheaper Weed Control Strategies. 34% of cost production for agri-chemicals - PowerPoint PPT PresentationTRANSCRIPT
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A Comparison of Full and ReducedRate Weed Management
Programs in Peanut
E.P. Prostko and T. L. GreyDept. of Crop & Soil Sciences
University of GeorgiaTiftonSWSS 2004
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The Need for Cheaper Weed Control Strategies
34% of cost production for agri-chemicals
reduction in support price from $619 to $355
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Strongarm/Valor Combinations
compliment each other
lower rates reduced cost less carryover? less injury
different MOA not labeled in 2003
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OBJECTIVE to determine if the combination of 0.25X rates of
Strongarm + Valor would provide control equivalent to full rates of either applied alone
Why?
* Strongarm @ 0.45 ozs/A = $16.00
* Valor @ 3 ozs/A = $12.90
* Strongarm (0.113 ozs/A) + Valor (0.75 ozs/A) = $7.23/A
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Materials and Methods
small plots irrigated fields 3-4 replications 5 trials late-season ratings yield data DNA used for grass
control
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ResultsCrop Injury
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Peanut Stunting - 7 DATAttapulgus 2003
7
45
15
0
20
40
60
Strongarm (S) Valor (V) S + V
%
LSD 0.05 = 3
(0.45 ozs/A) (3.0 ozs/A) (0.113 + 0.75 ozs/A)
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Peanut Stunting - 14 DATTifton 2003
9
19
60
20
40
60
Strongarm (S) Valor (V) S + V
%
LSD 0.05 = 4
(0.45 ozs/A) (3.0 ozs/A) (0.113 + 0.75 ozs/A)
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RESULTS - CONTROL2001
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Hophornbeam copperleaf control with reduced rates of Strongarm (S) and Valor (V)
91 DAP
99 98 99
0
20
40
60
80
100
S - 0.45 ozs V- 3 ozs S - 0.113 ozs + V - 0.75ozs
PE-14-01Randolph Co.
LSD 0.05 = 13
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Hophornbeam Copperleaf ControlRandolph County, GA - 2001
6 WAT
UntreatedStrongarm
(0.45 ozs/A)Valor
(3 ozs/A)Strongarm 0.113 ozs+ Valor 0.75 ozs/A
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RESULTS - CONTROL2002
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FL Beggarweed control with reduced rates of Strongarm (S) and Valor (V)
91 DAP
9893 96
0
20
40
60
80
100
S - 0.45 ozs V- 3 ozs S - 0.113 ozs + V - 0.75ozs
PE-09-02Attapulgus
LSD 0.05 = 8
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Smallflower morningglory control with reduced rates of Strongarm (S) and Valor (V)
91 DAP
98 98 98
0
20
40
60
80
100
S - 0.45 ozs V- 3 ozs S - 0.113 ozs + V - 0.75ozs
PE-09-02Attapulgus
LSD 0.05 = 2
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Common ragweed control with reduced rates of Strongarm (S) and Valor (V)
91 DAP
98 98 98
0
20
40
60
80
100
S - 0.45 ozs V- 3 ozs S - 0.113 ozs + V - 0.75ozs
PE-09-02Attapulgus
LSD 0.05 = 7
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Weed control in peanuts with reduced rates of Strongarm and Valor, 2002.
Untreated Strongarm0.45 oz/A
Valor3 oz/A
Strongarm0.113 oz/A +
Valor0.75 oz/AAttapulgus, GA (7 WAP)
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RESULTS - CONTROL2003
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FL Beggarweed control with reduced rates of Strongarm (S) and Valor (V)
91 DAP
98 98 96
0
20
40
60
80
100
S - 0.45 ozs V- 3 ozs S - 0.113 ozs + V - 0.75ozs
PE-01A-03Tifton
LSD 0.10 = 5
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Annual MG control with reduced rates of Strongarm (S) and Valor (V)
91 DAP
98 9789
0
20
40
60
80
100
S - 0.45 ozs V- 3 ozs S - 0.113 ozs + V - 0.75ozs
PE-01A-03Tifton
LSD 0.10 = 5
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Reduced Rates of Strongarm and Valor - I
PE-01A-0391 DAP
Untreated Strongarm0.45 ozs/A
Valor3 ozs/A
Strongarm0.113 ozs/A
+ Valor
0.75 ozs/A
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Bristly starbur control with reduced rates of Strongarm (S) and Valor (V)
91 DAP
9993
99
0
20
40
60
80
100
S - 0.45 ozs V- 3 ozs S - 0.113 ozs + V - 0.75ozs
PE-01B-03Attapulgus
LSD 0.10 = 5
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Common ragweed control with reduced rates of Strongarm (S) and Valor (V)
91 DAP
99 99 99
0
20
40
60
80
100
S - 0.45 ozs V- 3 ozs S - 0.113 ozs + V - 0.75ozs
PE-01B-03Attapulgus
LSD 0.10 = 20
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Reduced Rates of Strongarm and Valor - II
PE-01B-0391 DAP
Untreated Strongarm0.45 ozs/A
Valor3 ozs/A
Strongarm0.113 ozs/A
+ Valor
0.75 ozs/A
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Tropical spiderwort control with reduced rates of Strongarm (S) and Valor (V)
0
20
40
60
80
100
12 DAT 26 DAT 41 DAT 64 DAT 109 DAT
Con
trol
-%
S - 0.45 ozs V - 3.0 ozs S - 0.113 ozs + V - 0.75 ozs
PE-24-03Grady County
(LSD 0.05 = 11) (LSD 0.05 = 11) (LSD 0.05 = 15) (LSD 0.05 = 22)(LSD 0.05 = 11)
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RESULTS - YIELD2003
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Peanut Yield Response to Reduced Rates of Strongarm (S) and Valor (V) - I
3916
5598
45964937
0
1000
2000
3000
4000
5000
6000
Untreated S - 0.45 ozs V - 3 ozs S - 0.113 ozs +V - 0.75 ozs
lbs/A
PE-01A-03Tifton LSD 0.10 = 612
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Peanut Yield Response to Reduced Rates of Strongarm (S) and Valor (V) - I
fb Cadre (ozs/A)
5598
45964937
61055784 5835
5874 5835 5977
5816 5771 5951
0
1000
2000
3000
4000
5000
6000
7000
S - 0.45 ozs V - 3 ozs S - 0.113 ozs + V -0.75 ozs
lbs/A
0 0.72 1 1.44
PE-01A-03Tifton LSD 0.10 = 612
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Peanut Yield Response to Reduced Rates of Strongarm (S) and Valor (V) - II
2158
52284808
5228
0
1000
2000
3000
4000
5000
6000
Untreated S - 0.45 ozs V - 3 ozs S - 0.113 ozs +V - 0.75 ozs
lbs/A
PE-01B-03Attapulgus LSD 0.10 = 585
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Peanut Yield Response to Reduced Rates of Strongarm (S) and Valor (V) - II
fb Cadre (ozs/A)
52284808
5228
5494
4695
5487
5144 5172 5277
52844941
5368
0
1000
2000
3000
4000
5000
6000
7000
S - 0.45 ozs V - 3 ozs S - 0.113 ozs + V -0.75 ozs
lbs/A
0 0.72 1 1.44
PE-01B-03Attapulgus LSD 0.10 = 585
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SummaryReduced Rates
less injurious than Valor at full rate similar weed control except for tropical
spiderwort and annual mg when used in total program (pre + post),
equivalent yields when compared to full rate programs
digging efficiency/weed seed bank concerns?
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ACKNOWLEDGMENTS
This research was partially funded through a grant provided by the Georgia Agricultural Commodity Commission for Peanuts