Influence of Cadre on Georgia Green Yield and Seed Germination

Eric P. Prostko and Tim L. GreyDepartment of Crop & Soil SciencesUniversity of Georgia

APRES 2005

Cadre (imazapic)

• BASF product• labeled for peanut in

1996• postemergence

– nutsedges– broadleaf– small grasses

• very popular– 64% in GA

• $13-18/A• rotation restrictions

Peanut Varieties and CadreReference Varieties

Weed Tech. 1995 9:801-806 Florunner, NC-V11

Peanut Sci. 1995 22:76-80 Florunner, GA Runner, GK-7, NC-7, NC-V11, Southern Runner, Sunrunner, VC-1

Weed Tech. 1996 10:145-152 Florunner, Southern Runner, Sunrunner

Weed Sci. 1996 44:615-621 Florunner, Southern Runner, NC-7

Weed Tech. 1997 11:714-719 Florunner

Peanut Sci. 1997 24:113-116 Tamrun 88

Weed Tech. 1997 11:520-526 Florunner, Southern Runner

Weed Tech. 1999. 13:494-503 NC-10

Peanut Sci. 2000 27:17-22 Florunner

Weed Tech. 2001 15:26-29 AT-120, GK-7, NC-7, Tamspan 90

Georgia Green in Georgia

30

89 90 88

0

20

40

60

80

100

1997 1999 2001 2003

Year

Acr

es P

lant

ed -

%

Source: UGA Peanut Production Surveys

Peanut Stand Issues

• TSWV

• Florida MDR98

• DP-1

• GA-01R

• Do herbicides influence seed germination?

Objectives

• Influence of Cadre on Georgia Green……

– Yield

– Seed size

– germination

Materials and Methods

• Small plot techniques (4 reps)

• Planting date: May 13, 2004

• twin rows

• Cadre @ 1.44 ozs/A + Agrioil @ 1% v/v– 8, 14, 22, 27, 34, 41, 47, 57 DAP

• Weed-free conditions– Strongarm + Prowl– hand-weeded

• 1000 lbs/A Gypsum on June 23, 2004

Timing (DAP) Stage of Growth

8 V2-V3

14 V5

22 V6

27 R1

34 R1-R2

41 R2

47 R3-R4

57 R4-R5

Stages of Growth

Seed Collection

• 100 pods after digging but before combine• Stored at room temperature for 36 days• hand-shelled• weight of 100 seed• placed in cold storage (320F) for 18 days• germination test at 770F• Seed stored at room temperature (20

days)• Germination test at 680F

Germination Tests

• Growth chamber• Dark conditions• Two constant temperatures

– 680 and 770 F– 2 runs

• Petri dishes• 2 layers of filter paper• 10 seeds/dish• 10 mls of tap water• 7 days

Results

Georgia Green Yield Response to Cadre(1.44 ozs/A + Agrioil @ 1% v/v)

48285016

47335065

44514619

5301

48345205

0

1000

2000

3000

4000

5000

6000

Untreat

ed

8 DAP

14 D

AP

22 D

AP

27 D

AP

34 D

AP

41 D

AP

47 D

AP

56 D

AP

Timing

lbs/

A

P = 0.4515CV = 11.21

PE-11-04Attapulgus

Influence of Cadre on Georgia Green Seed Size(1.44 ozs/A + Agrioil @ 1% v/v)

5861

57 59 57 56 57 58 58

0

15

30

45

60

75

Untreat

ed

8 DAP

14 D

AP

22 D

AP

27 D

AP

34 D

AP

41 D

AP

47 D

AP

56 D

AP

Timing

g/10

0 se

ed

P = 0.0921CV = 3.81

PE-11-04Attapulgus

Influence of Cadre on Georgia Green Seed Germination (770F- 7 days)

(1.44 ozs/A + Agrioil @ 1% v/v)

9487

9097

9399

9298

94

0

20

40

60

80

100

Untreat

ed

8 DAP

14 D

AP

22 D

AP

27 D

AP

34 D

AP

41 D

AP

47 D

AP

56 D

AP

Timing

% (

7 da

ys)

P = 0.08CV = 5.68

PE-11-04Attapulgus(average of 2 runs)54 day old seed

Influence of Cadre on Georgia Green Seed Germination (680F - 7 days)

(1.44 ozs/A + Agrioil @ 1% v/v)

8488

83

96

78

88 89 89

78

0

20

40

60

80

100

Untreat

ed

8 DAP

14 D

AP

22 D

AP

27 D

AP

34 D

AP

41 D

AP

47 D

AP

56 D

AP

Timing

% (

7 da

ys)

P = 0.1689CV = 9.2

PE-11-04Attapulgus(average of 2 runs)74 day old seed

Summary

• Cadre had no effect on …..– Yield– Seed size– seed

germination

2005 Research

• Cadre @ 1.44 ozs/A + COC @ 1% v/v

– 30 and 45 DAP

• 2,4-DB @ 1.1 pts/A + COC @ 1% v/v

– 75 and 95 DAP

• 3 peanut varieties

– GA Green, C99-R, GA – 01R

• 2 locations in Georgia

• National Peanut Board Funding

www.gaweed.com