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

1
Response of Roundup Ready Flex Cotton to
Co-application with Insecticides and Plant Growth
Regulators

• Jimmy X. Zumba
• D. K. Miller, R. Bagwell, E. Burris, E. L.
  Clawson, S. T. Kelly, B. R. Leonard, A. M.
  Stewart, and M. S. Mathews
• LSU AgCenter

2
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

3
Roundup Ready Technology

• Eliminate applications and tillage operations
• Easy application trigger
• Broad spectrum of control
• Tank-mix partners
• Flex introduction
• (variety and herbicide)

4
Justification

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

5
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.

6
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.

7
Materials and Methods

• Factor A Growth Stage
• Pinhead Square
• First Bloom
• Factor B Herbicide Treatment
• MON 3539 (0.75 lb ai/A)
• MON 3539 (0.75 lb ai/A) Mepex Gin Out (0.022
  lb ai/A)
• Factor C Insecticide
• Acephate (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)

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Grow Stages
9
Parameters Measured

• Visual injury 6 and 14 DAT
• Plant height 7 DAT
• Seedcotton Yield
• Cotton maturity

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Percent Visual Injury 6 DAT
11
Percent Visual Injury 14 DAT
12
Cotton Height 7 DAT
13
Cotton Maturity( first pick)
Growth Stage Herbicide Treatment First Year () Second Year () Two year Combined ()
Pinhead MON 3539 Mepex Gin Out 83.8 a 91.3 b 87.6 a
Pinhead MON 3539 83.9 a 92.2 b 88.1 a
First Bloom MON 3539 Mepex Gin Out 83.4 a 91.5 b 87.5 a
First Bloom MON 3539 84.8 a 91.1 b 87.8 a
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Yield
Growth Stage Herbicide Treatment First Year (Seedcotton lbs/A) Second Year (Seedcotton lbs/A)
Pinhead MON 3539 Mepex Gin Out 2558 a 1929 b
Pinhead MON 3539 2509 a 1955 b
First Bloom MON 3539 Mepex Gin Out 2667 a 1828 b
First Bloom MON 3539 2566 a 1846 b
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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.

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Questions?