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Weed Management on Putting Greens

Weed Management on Putting Greens. Dr. Tim R. Murphy Extension Weed Specialist University of Georgia Griffin. Problem Putting Green Weeds. Annual Bluegrass - annual and perennial Goosegrass Crabgrass occasional broadleaf weeds nutsedge(s). Bermudagrass Greens.

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Weed Management on Putting Greens

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  1. Weed Management on Putting Greens Dr. Tim R. Murphy Extension Weed Specialist University of Georgia Griffin

  2. Problem Putting Green Weeds • Annual Bluegrass - annual and perennial • Goosegrass • Crabgrass • occasional broadleaf weeds • nutsedge(s)

  3. Bermudagrass Greens • Preemergence crabgrass and goosegrass • Bensulide (Bensumec, Pre-San, Betasan • Dithiopyr (Dimension) • Bensulide + oxadiazon (Scotts Goosegrass/Crabgrass Control)

  4. Bermudagrass Greens • Postemergence crabgrass and goosegrass • Diclofop (Illoxan), goosegrass only • MSMA/DSMA - low rates, repeat applications, very risky, avoid air temperatures > 85 F.

  5. Bermudagrass Greens • Preemergence annual bluegrass control • Pronamide (Kerb) , apply 60 to 90 days before overseeding, activated charcoal is used when applications made < 90 days before overseeding • Fenarimol (Rubigan), apply 2 to 3 applications, last application 14 days before overseeding perennial ryegrass (30 days on P. trivialis), apply low rate in Jan.-Feb, for extended control

  6. Creeping Bentgrass Greens • Preemergence crabgrass and goosegrass • Bensulide (Bensumec, Pre-San, Betasan • Dithiopyr (Dimension) • Bensulide + oxadiazon (Scotts Goosegrass/Crabgrass Control)

  7. Creeping Bentgrass Greens • Postemergence crabgrass and goosegrass • No herbicides labeled for this use • Low tolerance of creeping bentgrass • MSMA/DSMA - very risky • Acclaim Extra - too injurious

  8. Creeping Bentgrass Greens • Annual bluegrass control • Paclobutrazol (Scotts TGR, Trimmit) • a plant growth regulator that inhibits gibberellin biosynthesis • Poa more sensitive than bentgrass • apply in spring after bentgrass growth has resumed • works slowly, repeat applications needed • fall + spring applications needed for P. annua var. reptans

  9. Perennial Poa Treatments (Johnson and Murphy, 1995) • TGR applied Oct. 1 + Nov 12 fb Mar 15 + May 1 for 2 yr suppressed Poa 28% 4 MAT • TGR at 0.5 + 0.25 fb 0.5 + 0.25 lbs. Ai/acre • Cutless at same dates and rates suppressed Poa 6% 4 MAT

  10. Perennial Poa Treatments (Johnson and Murphy, 1996)

  11. Perennial Poa Suppression

  12. Maximum Bentgrass Injury

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