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Effects of Postemergence Herbicides on Centipedegrass Seed Production

Effects of Postemergence Herbicides on Centipedegrass Seed Production. J. A. Ferrell, T. R. Murphy, W. K. Vencill University of Georgia. Centipedegrass popularity. Propagated via seed or sod Low maintenance Slow growth Low nitrogen requirement Herbicide tolerance

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Effects of Postemergence Herbicides on Centipedegrass Seed Production

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  1. Effects of Postemergence Herbicides on Centipedegrass Seed Production J. A. Ferrell, T. R. Murphy, W. K. Vencill University of Georgia

  2. Centipedegrass popularity • Propagated via seed or sod • Low maintenance • Slow growth • Low nitrogen requirement • Herbicide tolerance • Sethoxydim and clethodim • Halosulfuron

  3. Traditional Emphasis Color Seedhead Suppression Weed Control Production Emphasis Seed Yield Seed Quality Weed Control Changing Needs

  4. Digitaria sanguinalis

  5. Cyperus esculentus

  6. Objectives Determine the impact of herbicide and treatment timing on: • Seedhead suppression • Seed yield • Seed quality

  7. Herbicides Clethodim Sethoxydim Halosulfuron Spray Timing -4 WPS* -2 WPS 0 WPS (Late July) 2 WPS 4 WPS Herbicide Treatments * Weeks post seedhead emergence

  8. Materials and Methods • Macon County, Georgia seed farm • Greenville clay loam • Established centipedegrass (cv. ‘TifBlair’) • Irrigated, weed-free site • Plot size – 6’ X 20’ • 3 replications

  9. Materials and Methods • Clethodim – 0.25 lb ai A-1 +0.25% v/v NIS • Sethoxydim – 0.28 lb ai A-1 • Halosulfuron – 0.062 lb ai A-1 + 0.5% v/v NIS • 25 GPA, flat fan nozzles, CO2 backpack • Seedhead suppression –0 to 100 scale • 3 x 5 factorial • Analysis: herbicide within treatment timing

  10. Seedhead Suppression

  11. Seedhead Suppression NS – non significant

  12. Seedhead Suppression (0 WPS)

  13. Seedhead Suppression (2 WPS)

  14. Seed Yield • October 10, 2001 • Harvested 2 randomly selected m2quadrants • Seeds removed from heads with mechanical thrasher

  15. Seed Yield

  16. Seed Germination • Conducted by Georgia State Seed Test Lab • Conditions: • Covered petri dish with moist paper • Temperature – 20 to 35o C • Counts – 7 and 21 days

  17. Seed Germination

  18. Conclusions • Halosulfuron does not affect centipedegrass seed yield or germination • Apply clethodim or sethoxydim as early as possible (minimum 4 WBS) • Once seedheads emerge, use of clethodim or sethoxydim is not advisable

  19. Future Centipedegrass Research • Investigate effect of clethodim and sethoxydim in salvage situations (6, 8, 10 WPS) • Effect of other commonly used herbicides on seed yield and quality • Develop weed management systems in seedling centipedegrass

  20. Acknowledgements • Valent USA • The Turfgrass Group • Bill Nutt - technical assistance

  21. Any Questions? www.bmen.tulane.edu/~mroberts

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