1. Roundup Ready Technology
Approximately 350,000 cotton acres in LA in 2007
Vast majority planted to transgenic variety for insect and weed problems
Mostly Roundup Ready varieties for weed control

2. Roundup Ready Technology
Eliminated applications and tillage operations
Broad spectrum of
control
Rotational flexibility
Flex introduction

3. Roundup Ready Flex Increased tech fees Larger faster moving equipment
Co-applications
(herbicides, insecticides,
PGR)

4. D. K. Miller, D. R. Lee, and M. S. Mathews LSU AgCenter
Two-year Evaluation of Cotton Tolerance to POST Co-application of Prowl H2O and Insecticides
D. K. Miller, D. R. Lee, and M. S. Mathews
LSU AgCenter

5. Objectives
Investigate effects of insecticides on Roundup Ready Flex cotton tolerance when co-applied with glyphosate and Prowl H2O

6. Materials and Methods Northeast Research Station, St. Joseph LA
RCB; 4 replications
Planted 5/3/06 and 5/1/07; 6.67’ x 25’ plots;
ST4554B2RF (06’) DP 164 B2RF (07’)
CO2 sprayer; 15 GPA; 4-5 leaf

7. Materials and Methods Roundup Weathermax at 22 oz/A
Roundup Weathermax at 22 oz/A plus Prowl H2O at 32 oz/A alone or plus:
Acephate (0.5 lb/A)
Baythroid (2.1 oz/A) Bidrin (6.4 oz/A)
Centric (1.88 oz/A)
Dimethoate (8 oz/A)
Karate Z (2 oz/A)
Mustang Max (3.5 oz/A)
Trimax (1.5 oz/A)
Vydate C-LV (13.6 oz/A)

8. Parameters Measured Visual injury 5, 14, and 28 DAT
Plant height 7 and 21
DAT
Seedcotton Yield
ANOVA

9. Injury 5 DAT 2006

10. Injury 5 DAT 2007

11. Injury 14 DAT 2006
14 to 23%

12. Injury 14 DAT 2007

13. Cotton Height 7 DAT 2006
17 to 19 cm

14. Cotton Height 7 DAT 2007
16 to 19 cm

15. Cotton Height 21 DAT 2006 0%
34 to 41 cm

16. Cotton Height 21 DAT 2007 0%
33 to 36 cm

17. Yield 2006
3349 to 4039 lb/A

18. Yield 2007
2462 to 2763 lb/A

19. Conclusion
In Flex cotton, glyphosate co-application with Prowl H2O and insecticides can offer producers the ability to integrate pest management strategies and reduce application costs with no long term effect on crop
Questions???