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Weed Control in Sod Production Fields

Weed Control in Sod Production Fields. Tim R. Murphy The University of Georgia. Weed Problems in Sod. Intensive irrigation and fertility effects Effect of herbicides on sod Row crop weeds Common bermudagrass control Row crop vs. turf herbicides Same ai and formulation. Cultural Control.

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Weed Control in Sod Production Fields

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  1. Weed Control in Sod Production Fields Tim R. Murphy The University of Georgia

  2. Weed Problems in Sod • Intensive irrigation and fertility effects • Effect of herbicides on sod • Row crop weeds • Common bermudagrass control • Row crop vs. turf herbicides • Same ai and formulation

  3. Cultural Control • Avoid over-irrigation • Install drainage if needed • Properly mow on schedule • Will control most tall-growing broadleaf weeds • Maintain pH and fertility • Control insects and diseases • Know weed spectrum

  4. Hit or Miss Vs. PlannedProgram

  5. PrePlant Weed Control • Essential for common bermudagrass control • Will require one fallow season • Roundup Pro • Still the best herbicide unless fumigation is used • Repeat applications will be needed

  6. Roundup Rate and Bermudagrass Control DAT = Days after Treatment

  7. Bermuda Control with Roundup – 1 yr.

  8. Bermudagrass Control with Roundup(averaged across Tifway, Tifgreen, Tifdwarf, Ormond) Applied in late May, late June and Mid-August. Mowed at 1.0 inch. Rated June of year after application

  9. “Newer” Sod Herbicides • Envoy - centipedegrass • Lontrel • Confront • Drive • Manor, Blade • Corsair

  10. “Newer” Sod Herbicides • Prompt 5L • Label changes for Kerb

  11. Envoy (Valent) • SLN Georgia Label • Centipede sod farms only • Suppresses bermudagrass • Controls annual grasses • Not for use on seed fields • Apply 3 wks after green-up • Delay mowing 7 days before and after

  12. Envoy - Bermuda Suppression • Two applications at 34.0 fl. oz./acre • Four applications at 17.0 fl. oz./acre • 1st - 3 to 6 inch bermuda growth • 2nd, 3rd, 4th - 3 to 3 inch bermuda growth • Also controls most other annual grasses

  13. Envoy • Clethodim • 0.94 lbs./gal. - EC • 17.0 to 34.0 fl. oz./acre • Add nonionic surfactant at 0.25% v/v

  14. Sethoxydim (Vantage) - Centipedegrass • Controls annual grasses • Suppresses bahiagrass and bermudagrass • No annual bluegrass control • No nutsedge (nutgrass) control

  15. Vantage - Centipedegrass • No COC needed • Established • Seedling - 3 in. stolon growth • Delay mowing 7 d before and after application

  16. Vantage – Bahiagrass Suppression • 2.25 pts./acre • Delay mowing – 7 d before and after application • Repeat application - 10 to 14 days • Bahia must be actively-growing

  17. Lontrel - DowAgrosciences • 3.0 lb./gal. clopyralid • Highly active on legumes and aster weeds • Also controls curly dock, smartweed • Rate 1/4 to 1.0 pt./acre • High rate needed for smartweed • Will not control dichondra (ponyfoot)

  18. Turfgrass Tolerance to Lontrel

  19. Confront - DowAgrosciences • Triclopyr + clopyralid (2.25 + 0.75 lbs./gal.) • Amine formulation • Active on wide range of broadleaf weeds • Clopyralid highly active on asters and legumes • Triclopyr controls chickweeds, henbit, mat lippia, lambsquarters, Va. Pepperweed, shepherdspurse

  20. Turfgrass Tolerance to Confront

  21. Confront • Use 1.0 to 2.0 pts./acre • Use on healthy, well established turf • Delay reseeding for 3 weeks • Mow seedling turf 2 to 3 times before application • Needs 6 hour rain-free period

  22. Drive - TopPro • Quinclorac 75 DF • Add crop oil concentrate (2.0 pts./acre) • Labeled on tall fescue, Ky. Bluegrass, zoysiagrass, bermudagrass • DO NOT use on centipedegrass or St. Augustinegrass

  23. Drive - TopPro • May be used before or after sprigging zoysiagrass • Controls crabgrass (except smooth), white clover, hop clovers, speedwell, dollarweed • Torpedograss - requires 2 to 3 applications • Will not control goosegrass • Use with extreme caution near tomatoes, bell peppers, etc.

  24. Manor, Blade • Metsulfuron 60 DF • Excellent option for ‘Pensacola’ bahiagrass and broadleaf control in warm-season turfgrasses • Do not use on bahiagrass • Low rate - < 1.0 oz. product/acre • Use only 0.25 to 0.5 oz/acre on centipede • Use with nonionic surfactant

  25. Corsair - Riverdale • Chlorsulfuron 75% • Used primarily for spot control of clumpy tall fescue in bermuda, zoysia, centipede, St. Augustine, Ky. Bluegrass – works slowly • Avoid transition applications on centipede, zoysia, St. Augustine • Repeat application in 60 d • Add NIS at ¼ to 1/3 fl. oz./gallon of spray mix

  26. Prompt - TopPro • Pre-mix of bentazon+atrazine (2.5 lbs./gal. each) • Labeled for bermuda, centipede, St. Augustine, zoysia (some injury to bermuda) • Good option for yellow nutsedge, kyllinga, globe sedge, and numerous broadleaf weeds • May be used 10 d after sprigging • 2.4 pts./acre, repeat 7 to 10 d later for sedges

  27. Kerb – Rohm & Haas • Label expanded to include centipede, St. Augustine and zoysia • Perennial ryegrass removal – apply at 50% green-up growth stage • Poa annua control during winter months • Needs rainfall or irrigation event (0.25 in.) within 24 to 48 hrs

  28. At-Sprigging Options • Ronstar 2G - bermuda, zoysia, paspalum • Ronstar 50WSP - bermuda • Atrazine - centipede, St. Augustine, zoysia • Simazine - centipede, St. Augustine, zoysia

  29. Ronstar 2G and 50WSP - At Sprigging • 2G - 100 to 150 lbs./acre • 50WSP - 4.0 to 6.0 lbs./acre • Apply immediately before or after sprigging • Pre-sprigging (1 day before sprigging slightly safer than post-sprigging) • Irrigate ASAP for best results

  30. Atrazine and Simazine - At Sprigging • Centipede, St. Augustine, zoysia • Atrazine - labeled up to April 15 • Simazine - labeled up to June 1 • Do not apply within 30 days before lifting • Apply 2 days after lifting sod on old beds - FL • Apply 7 to 10 days after sprigging - FL

  31. TOLERANCE OF NEWLY-SPRIGGED CENTIPEDEGRASS TO ATRAZINE AND SIMAZINE

  32. DNA’s Barricade Pendulum Surflan Balan Treflan Dimension Best used on established turf. Mitotic inhibitors. Relatively immobile in the soil Minimal use in sod fields The majority of herbicides used in turfgrasses for preemergence annual grass control are dinitroanilines and dithiopyr

  33. DNA and Dimension root inhibition Surflan on St. Augustinegrass pendimethalin on zoysiagrass Dimension on bermudagrass Swollen, club shaped roots

  34. Sedge Herbicides - Turfgrasses • Basagran T/O - yellow, annual sedges • Manage - yellow, purple, annual sedges • MSMA/DSMA - yellow, purple, annual sedges • Image - yellow, purple, annual sedges • Pennant - yellow, annual sedges • 2,4-D - yellow, very poor activity

  35. UGA Turf Weed Science Web Page • www.georgiaturf.com • 193 weed species • 30 popular articles • UGA turf weed science recommendations • links to herbicide labels, MSDS

  36. UGA Weed Science Web Site • www.gaweed.com • Covers all crops including turf and ornamentals • Weed Identification • Currently has over 40 PowerPoint slide sets that can be downloaded • PLEASE USE IT!!!!!!!!!!!!!!!!

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