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

The Need for Cheaper Weed Control Strategies

34% of cost production for agri-chemicals

reduction in support price from $619 to $355

Strongarm/Valor Combinations

compliment each other

lower rates reduced cost less carryover? less injury

different MOA not labeled in 2003

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

Materials and Methods

small plots irrigated fields 3-4 replications 5 trials late-season ratings yield data DNA used for grass

control

ResultsCrop Injury

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)

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)

RESULTS - CONTROL2001

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

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

RESULTS - CONTROL2002

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

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

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

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)

RESULTS - CONTROL2003

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

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

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

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

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

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

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)

RESULTS - YIELD2003

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

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

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

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

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?

ACKNOWLEDGMENTS

This research was partially funded through a grant provided by the Georgia Agricultural Commodity Commission for Peanuts