UGA Cotton Extension Program

Guy D. Collins, Ph.D.

Extension Cotton Agronomist

University of GeorgiaTifton, GA

2010…Replacing DP 555 BG/RR• DP 555 BG/RR planted on approximately

82.53 % of cotton acres in GA during 2009

• Total 2009 GA cotton acreage = 990,000

• Dealers allotted 33 % of 2009 DP 555 BG/RR for 2010

• 2010 GA cotton acreage = 1,250,000

• In 2010, an estimated 900,000+ acres will be planted to new/other varieties

Variety selection criteria

• YIELD potential

• YIELD stability

• Technology

• Fiber quality

• Maturity and plant growth characteristics

Late Varieties – Irr. & Dryland- by technology

0

500

1000

1500

2000

2500

BG2/RF W/R BG/RR W/RF LL/BG2 RF

Lint Yield (lbs/A)

1177 1113 1098 1068 1064 1050 1022 1016 1002 987

0

200

400600

800

1000

1200

1400

ST 5458B2RF

FM 1740B2RF

PHY 370WR

DP 0935B2RF

ST 5288B2RF

PHY 375WRF

DP 0949B2RF

DP 0912B2RF

DP 555BR

PHY 485WRF

2009 GA County Trials – Dryland (Burke, Candler, Colquitt, Early, Jefferson, Lowndes, SE Gin)

Inconsistency among varieties tested at each location….difficult to evaluate!!

Lint Yield (lbs/A)

Uniform County Variety Trial Program

DP

0949

B2R

F31

0

PHY

565

WRF

309

ST 4

288

B2R

F30

8

DP

1048

B2R

F30

7

PHY

485

WRF

306

ST 5

458

B2R

F30

5

DP

1050

B2R

F30

4

PHY

375

WRF

303

FM 1

740

B2R

F30

2

Rep 3

DP

555

BR

301

PHY

565

WRF

210

DP

0949

B2R

F20

9

DP

1048

B2R

F20

8

ST 4

288

B2R

F20

7

ST 5

458

B2R

F20

6

PHY

485

WRF

205

PHY

375

WRF

204

DP

1050

B2R

F20

3

DP

555

BR

202

Rep 2

FM 1

740

B2R

F20

1

DP

0949

B2R

F11

0

PHY

565

WRF

109

ST 4

288

B2R

F10

8

DP

1048

B2R

F10

7

PHY

485

WRF

106

ST 5

458

B2R

F10

5

DP

1050

B2R

F10

4

PHY

375

WRF

103

FM 1

740

B2R

F10

2

Rep 1

DP

555

BR

101

Field EdgeD

P 09

49 B

2RF

310

PHY

565

WRF

309

ST 4

288

B2R

F30

8

DP

1048

B2R

F30

7

PHY

485

WRF

306

ST 5

458

B2R

F30

5

DP

1050

B2R

F30

4

PHY

375

WRF

303

FM 1

740

B2R

F30

2

Rep 3

DP

555

BR

301

PHY

565

WRF

210

DP

0949

B2R

F20

9

DP

1048

B2R

F20

8

ST 4

288

B2R

F20

7

ST 5

458

B2R

F20

6

PHY

485

WRF

205

PHY

375

WRF

204

DP

1050

B2R

F20

3

DP

555

BR

202

Rep 2

FM 1

740

B2R

F20

1

DP

0949

B2R

F11

0

PHY

565

WRF

109

ST 4

288

B2R

F10

8

DP

1048

B2R

F10

7

PHY

485

WRF

106

ST 5

458

B2R

F10

5

DP

1050

B2R

F10

4

PHY

375

WRF

103

FM 1

740

B2R

F10

2

Rep 1

DP

555

BR

101

Field Edge

15 trial sites and 22 cooperating agents

Training / mentoring program for younger agents

Funds to support plant growth evaluation and harvest equipment

Similar trial for Dr. Peng Chee’s conventional lines

____________Irrigated____________ ________Dryland________Avg Yield

- locs

combinedVariety Bainbridge Midville Plains Tifton Midville Plains Tifton

FM 1740 B2RF 1683 2145 2119 2187 1651 1770 1939 1928

DG 2570 B2RF 1538 2111 2377 1980 1730 1913 1794 1920

09R619 B2R2 1466 2101 2563 2034 1570 1803 1695 1890

DP 0920 B2RF 1691 2100 2166 2154 1660 1725 1530 1861

PHY 370 WR 1455 1979 2255 2005 1720 1756 1753 1846

DP 0935 B2RF 1510 2100 2250 2006 1702 1708 1557 1833

DP 0924 B2RF 1438 2120 2179 1649 1633 1770 1874 1809

DP 0912 B2RF 1407 2050 2297 1918 1591 1827 1508 1800

ST 5288 B2F 1296 2140 2189 1880 1537 1834 1652 1790

PHY 367 WRF 1591 1883 2112 1887 1652 1675 1725 1789

CG 3220 B2RF 1315 2083 2151 1812 1755 1537 1612 1752

ST 4498 B2RF 1722 1972 2065 1752 1625 1577 1542 1751

AM1550 B2RF 1430 1762 2014 2003 1508 1623 1741 1726

PHY 375 WRF 1297 1765 2022 1881 1639 1755 1569 1704

ST 4288 B2F 1306 1941 1948 1979 1479 1625 1489 1681

2009 GA Cotton OVT Consistency & Variability

– Top 15 Early Varieties excluding Athens

Yield FM 1740 vs. DP 555

Plant Height

46.1

41.9 40.8 40.1 38.6

0

5

10

15

20

25

30

35

40

45

50

Hei

ght (

inch

es)

DP555 PHY375 DP0935 ST5458 FM1740

A

AB AB B B

- 7.5

Total Main-stem Nodes

26.42

22.16 22.71 21.89 21.14

0

5

10

15

20

25

30

Mai

n-st

em N

odes

DP555 PHY375 DP0935 ST5458 FM1740

A

BC B BC C

- 5.28

Total Boll Production

318,762 324,958

293,110308,211

321,279

0

50,000

100,000

150,000

200,000

250,000

300,000

350,000

Bolls

/ A

DP555 PHY375 DP0935 ST5458 FM1740

Percent Open Bolls

80.9

89.895.4

88.294.3

0

10

20

30

40

50

60

70

80

90

100

% O

pen

Bolls

DP555 PHY375 DP0935 ST5458 FM1740

BAB

AAB

A

+14.5%

Boll Production Compared to DP 555 BG/RR (1st Position)

Early Varieties Lint YieldFM 1740 B2RF 1928DG 2570 B2RF 192009R619 B2R2 1890DP 0920 B2RF 1861PHY 370 WR 1846DP 0935 B2RF 1833DP 0924 B2RF 1809DP 0912B2RF 1800ST 5288 B2F 1790PHY 367 WRF 1789CG 3220 B2RF 1752ST 4498 B2RF 1751AM 1550 B2RF 1726PHY 375 WRF 1704ST 4288 B2F 1681BCSX 1035 LLB2 1670SSG CT Linwood 1666NG 3331 B2RF 1653All-Tex Epic RF 1648

2009 GA Cotton OVT – Irr. & Dry combined– Top 19 Varieties (Bainbridge, Midville, Plains,Tifton)

Late Varieties Lint YieldDP 0949 B2RF 182609R621 B2R2 1788PHY 370 WR 1774DP 555 BG/RR 1767PHY 375 WRF 1755PHY 565 WRF 1747ST 5458 B2RF 1721DP 0935 B2RF 1707PHY 5922 WRF 1699DP 161 B2RF 1698PHY485 WRF 1671ST 5288 B2F 1653ST 5327 B2RF 1644DP 164 B2RF 1624BCSX 1015 LLB2 1620FM 1845 LLB2 1609PHY 480 WR 1609DP 174 RF 1591BCSX 1025 LLB2 1567

2010 Weather

75

80

85

90

95

100

105

1 3 5 7 9 11 13 15 17 19 21 23 25 27 29 31

2010

2000-2009

Changes in Management• DP 555 BGRR® = full-season variety, very aggressive growth

• New varieties = less aggressive growth??? earlier maturity ???

true cutout??

Growth Management for New VarietiesNew varieties….rank

growth could still result when excessive rains occur

BUT… pay close attention to plant growth when making PGR decisions, because excessive PGR use could inhibit yield potential in some of these newer early-maturing varieties

-Prebloom apps

-First bloom apps

-Midbloom apps

DP 1050 B2RF

Non-treated 12 oz/A @ 9-10 leaves

PHY 565 WRF

Non-treated 12 oz/A @ 9-10 leaves

Plant Height – Nontreated Cotton

0

5

10

15

20

25

30

35

40

DP 105

0 B2R

F

DP 094

9 B2R

F

PHY 375

WRF

ST 428

8 B2F

DP 555

BR

ST 545

8 B2F

PHY 565

WRF

DP 104

8 B2R

F

FM 1

740

B2RF

PHY 485

WRF

inches

Plant Height – Treated Cotton

0

5

10

15

20

25

30

DP 105

0 B2R

F

DP 094

9 B2R

F

PHY 375

WRF

ST 428

8 B2F

DP 555

BR

ST 545

8 B2F

PHY 565

WRF

DP 104

8 B2R

F

FM 1

740

B2RF

PHY 485

WRF

inches

Percent of Non-treated (Height)

0102030405060708090

100

DP 105

0 B2R

F

DP 094

9 B2R

F

PHY 375

WRF

ST 428

8 B2F

DP 555

BR

ST 545

8 B2F

PHY 565

WRF

DP 104

8 B2R

F

FM 1

740

B2RF

PHY 485

WRF

percent

DP 1050 B2RF vs FM 1740 B2F

Stance 3 oz/A @ 9-10 leaves

Stance 2 oz/A @ 9-10 leaves

DP 1050 B2RF vs FM 1740 B2F

Mepex 12 oz/A @ 9-10 leaves

Mepex 8 oz/A @ 9-10 leaves

Prebloom Growth Management

LRM 1x LRM 2x MEB 1x MEB 2x

9 leaf 4 oz/A 8 oz/A 8 oz/A 16 oz/A

+ 1 week 4 oz/A 8 oz/A ----------- ----------

+ 2 week 4 oz/A 8 oz/A ----------- ----------

First Bloom 4 oz/A 8 oz/A 8 oz/A 16 oz/A

Additionally, we are evaluating the necessity of prebloom applications, and or how well we can control growth with later-season applications

Prebloom Growth Management

LRM 8 oz/A 4 apps

MEB 8 oz/A 2 apps MEB 16 oz/A 2 apps

LRM 4 oz/A 4 apps

Non-treated

Collaborative/Other Projects

Questions ??Questions ??