Response of Roundup Ready Flex Response of Roundup Ready Flex Cotton to Co-application with Cotton to Co-application with Insecticides and Plant Growth Insecticides and Plant Growth

RegulatorsRegulators

Jimmy X. ZumbaJimmy X. ZumbaD. K. Miller, R. Bagwell, E. Burris, E. L. Clawson, S. T. D. K. Miller, R. Bagwell, E. Burris, E. L. Clawson, S. T. Kelly, B. R. Leonard, A. M. Stewart, and M. S. MathewsKelly, B. R. Leonard, A. M. Stewart, and M. S. Mathews

LSU AgCenterLSU AgCenter

Roundup Ready Technology

• Over 1,200,000 cotton acres planted in LA in last two years.

• 99 % Transgenic cotton in 2006

• Mostly Roundup Ready varieties for weed control

Roundup Ready Technology

• Eliminate applications and tillage operations

• Easy application trigger

• Broad spectrum of control

• Tank-mix partners

• Flex introduction(variety and herbicide)

Justification

• -Synergies or negative interactions between this new herbicide and other agrochemicals, growth regulators and insecticide, and on integrated pest and crop management strategies

Objectives

• -Investigate effects of insecticides and plant growth regulators when co-applied with MON 3539 (Roundup Herbicide) on Roundup Ready Flex cotton.

• -Determine if possible effects are influenced by cotton growth stage at time of application.

Materials and Methods• Northeast Research Station, St.

Joseph LA in 2005 and 2006

• ST4554B2RF

• RCB; factorial treatment arrangement; 4 replications

• Plots 6.67’ x 12’

• Tractor mounted compressed air sprayer; 110 02; 32 PSI; 15 GPA.

Materials and Methods• Factor A: Growth Stage

Pinhead SquareFirst Bloom

• Factor B: Herbicide TreatmentMON 3539 (0.75 lb ai/A)MON 3539 (0.75 lb ai/A) + Mepex Gin Out

(0.022 lb ai/A)

• Factor C: InsecticideAcephate (0.5 lb ai/A) Intruder (0.028 lb ai/A)Battery (0.1 lb ai/A) Karate Z (0.033 lb ai/A)Baythroid (0.033 lb ai/A) Lannate (0.4 lb ai/A)Bidrin (0.4 lb ai/A) Larvin (0.6 lb ai/A)Capture (0.0616 lb ai/A) Mustang Max (0.022 lb ai/A)Centric (0.047 lb ai/A) Prolex (0.016 lb ai/A)Curacron (1.0 lb ai/A) Steward (0.11 lb ai/A)Denim (0.01 lb ai/A Tracer (0.75 lb ai/A)Diamond (0.58 lb ai/A) Trimax (0.047 lb ai/A)Dimethoate (0.25 lb ai/A) Vydate (0.4 lb ai/A)

Grow Stages

Pinhead (Insect Damage) First Bloom

Parameters Measured

• Visual injury 6 and 14 DAT

• Plant height 7 DAT

• Seedcotton Yield

• Cotton maturity

Percent Visual Injury 6 DATPercent Visual Injury 6 DAT

1 cNo Insecticide2 cDimethoate2 cBidrin1 cCapture1 cBattery6 bCuracron

10 aLannateInjury 5 DAT (%)Insecticide

Two year combined

1 d1 cd0 d0 dNo insecticide

1 d1 d0 d4 bcdBattery

1 d4 bcd0 d0 dDimethoate

1 d1 d8 abc0 dCapture

6 bcd4 bcd3 bcd0 abLannate

4 bcd7 abcd6 bcd7 abcdCuracron

13 a1 d0 d0 dBidrin

MON 3539 + Mepex Gin OutMON 3539MON 3539 +

Mepex Gin OutMON 3539

First BloomPinhead Square

First Year

Percent Visual Injury 14 DATPercent Visual Injury 14 DAT

0% 1%

0

2

4

6

8

10

Injury 14 DAT

Second year

Pindhead

First Bloom

1% 0%

0

2

4

6

8

10

Injury 14 DAT

Second year

MON 3539

MON 3539 +Mepex GinOut

1% 0%

0

2

4

6

8

10

Injury 14 DAT

First year

Pindhead

First Bloom

0% 0%

0

2

4

6

8

10

Injury 14 DAT

First year

MON 3539

MON 3539 +Mepex Gin Out

Cotton Height 7 DATCotton Height 7 DAT

Two year combined

59 a 55 b

20

30

40

50

60

70

Height 7 DAT

MON 3539

MON 3539 +Mepex Gin Out

(cm)

Cotton MaturityCotton Maturity(% first pick)(% first pick)

GrowthStage Herbicide Treatment First Year

(%)Second Year

(%)

Two yearCombined

(%)

PinheadMON 3539 + Mepex Gin Out 83.8 a 91.3 b 87.6 a

MON 3539 83.9 a 92.2 b 88.1 a

First BloomMON 3539 + Mepex Gin Out 83.4 a 91.5 b 87.5 a

MON 3539 84.8 a 91.1 b 87.8 a

YieldYieldGrowthStage Herbicide Treatment First Year

(Seedcotton lbs/A)Second Year

(Seedcotton lbs/A)

PinheadMON 3539 + Mepex Gin Out 2558 a 1929 b

MON 3539 2509 a 1955 b

First BloomMON 3539 + Mepex Gin Out 2667 a 1828 b

MON 3539 2566 a 1846 b

Two year combined

2244 a 2220 a

100011501300145016001750190020502200

Seedcotton Yield (#'s)

Pinhead

First Bloom

Two year combined

2242 a 2222 a

100011501300145016001750190020502200

Seedcotton Yield (#'s)

MON 3539 +Mepex Gin Out

MON 3539

Conclusion

-When applied according to labeled rates in Roundup Ready Flex cotton varieties ®, Roundup Flex herbicide® co-applications can offer producers the ability to integrate pest and crop management strategies and reduce application costs with minimal effect on crop.

Questions?