Weed management on athletic fields
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Weed Management on Athletic Fields. Tim R. Murphy Crop and Soil Sciences The University of Georgia. Athletic Field - Agronomic Problems. Excessive wear and damage Lack of recovery time Compaction Poor drainage. Athletic Fields - People Problems.

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Weed Management on Athletic Fields

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Weed Management on Athletic Fields

Tim R. Murphy

Crop and Soil Sciences

The University of Georgia


Athletic Field - Agronomic Problems

  • Excessive wear and damage

  • Lack of recovery time

  • Compaction

  • Poor drainage


Athletic Fields - People Problems

  • Lack of equipment, personnel, chemicals, irrigation (MONEY)

  • Poor maintenance practices

  • Untrained maintenance personnel

  • Constant use schedules

  • Low budgets - high expectations


Hit or Miss

Or

A Planned Program


Practical Tips

  • Use only labeled herbicides

  • Get the right equipment

  • Train your applicator

  • Calibrate all equipment

  • Control weeds during the off-season or off-times


Georgia Posting Rule

  • Chapter 40-21-5

  • Administered by Georgia Department of Agriculture

  • 24 hour re-entry restriction for all pesticides

  • Contact Georgia Department of Agriculture for additional information


Bermudagrass Athletic Fields


Bermudagrass Athletic Fields


Bermudagrass - The Big Three

  • Simazine (Princep, Wynstar, etc.)

  • MSMA or DSMA

  • 2,4-D (possibly a 2-way or three-way)


Bermudagrass - Summer

  • Use MSMA for postemergence control of weedy grasses

  • 2 appl. for crabgrass, 7 to 10 day interval

  • 3 appl. for dallisgrass and bahiagrass, 5 day interval

  • Will help on nutsedge control


Non-overseeded Bermudagrass - Winter

  • Simazine or atrazine

  • Apply 1.0 lb. ai/acre in November

  • Repeat in January if necessary

  • Will control annual bluegrass, common chickweed, lawn burweed, henbit, etc.

  • Poor control of wild garlic/onion and perennial broadleaf weeds


Summer or Winter

  • Use 2,4-D alone or in 2-way or 3-way herbicides for wild/garlic onion and broadleaf weed control.

  • Can be used on overseeded fields after 3 to 4 mowings on perennial ryegrass

  • Tank-mix in summer with MSMA (do compatibility test) (Quadmec, Trimec Plus)

  • Avoid green-up and hot summer day applications


Athletic Fields - Preemergence Herbicides

  • Be careful on severely damaged fields

    • Most PRE herbicides affect root development from stolon nodes

  • Select oxadiazon products

    • Does not affect root development from stolon nodes

  • On non-damaged healthy fields numerous herbicides may be used


Dinitroanilines

  • Benefin - Balan

  • Oryzalin - Surflan

  • Pendimethalin - Pendulum

  • Prodiamine - Barricade

  • Trifluralin – an a.i. in Team

    • Used on most cool- and warm-season turfgrasses

    • Shoot and root absorbed, no translocation

    • Inhibit cell division


Dithiopyr

  • Dimension

  • MOA is similar to dinitroanilines

    • Shoot and root absorbed, no translocation

    • Inhibit cell division (tubulin formation)


DNA Root inhibition

Dimension on bermudagrass

Surflan on St. Augustinegrass

pendimethalin on zoysiagrass

Swollen, club shaped roots prevent “rooting down”


More Practical Tips

  • Observe posting regulation

  • Water-in (0.5 inch) all preemergence herbicides

  • Make applications on off-days, or off-times

  • Use a 20 to 40 gpa spray volume

  • Avoid post-herbicide use at air temperatures

    > 90 F. and during spring transition


Problem Athletic Field Weeds

  • Annual Bluegrass

  • Goosegrass, Crabgrass

  • Dallisgrass

  • Sedge(s)


Annual Bluegrass

  • Fall preemergence

  • late-Nov. - atrazine, simazine

  • mid-Jan. - atrazine, simazine, Sencor, Kerb

  • Dormant period - Roundup Pro, Finale


Non-Overseeded Bermudagrass

  • Numerous PRE and POST options for annual bluegrass

  • Triazines – standard, but resistance increasing

    • Kerb – works, costly, lateral run-off

    • Pre’s – work, but DNA resistance is here

    • Glyphosate – works, partial dormancy

    • Diquat – ineffective


Crabgrass

  • Mid-Feb. - March - apply Pre

    • repeat 8 wks later if 1/2 rate is used

  • Summer - MSMA

    • repeat 2x, 7 day interval, will not control goosegrass

  • Summer - Drive

    • one application, apply to seedling or big crabgrass, control of 1 to 4 tiller crabgrass is not consistent, will not control goosegrass


Goosegrass

  • Mid-Feb. - March - apply Pre

    • repeat 8 wks later if 1/2 rate is used

  • Summer - MSMA + Sencor

    • repeat 2x, 7 day interval, controls crabgrass

  • Summer - Sencor

    • repeat in 7 d, fair control crabgrass, more injury than MSMA alone


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

  • Monument - yellow, purple, annual sedges

  • Pennant - yellow, annual sedges


Green (perennial) kyllinga


Kyllinga spp. (Kyllinga spp.)

  • Sedge family

  • Annuals and perennials

  • Reproduce by seed and rhizomes

  • No tuber formation

  • Thrive in wet soils

  • Increasing in severity

  • Lack of MSMA use??


Kyllinga spp. - Control

  • Image

  • Image + MSMA

  • Manage

  • Monument

  • Continued applications of MSMA/DSMA

  • Repeat applications will be needed


MSMA, DSMA, CMA

  • Organic arsenicals

  • Post only, no soil activity

  • Crabgrass, other annual grasses

  • Weak on goosegrass

  • Nutsedge

  • Dallisgrass - tough to control


Dallisgrass Control with MSMA

  • Apply during good growing conditions

  • 2 to 3 applications

  • 5 to 7 days apart

  • Stay on schedule!!!

  • Avoid temperatures over 900 F.

  • Need 24 hour rainfree period


Dallisgrass Control with MSMA

  • 1976 - late July

  • 1977 - August 1

  • 7 day intervals


Overseeded Bermudagrass

  • It sure is pretty but…….

    • Cost and difficulty of controlling annual bluegrass increases

    • Perennial ryegrass becomes a weed during transition

    • Usually chemical removal is required

  • Broadleaf and wild garlic control

    • No problem

    • Delay application until after 2 to 4 mowings


Overseeded Bermudagrass

  • Options for annual bluegrass

  • Kerb - 60 to 90 days (or charcoal)

    • Dimension – 8 wks

    • Barricade – 8 wks, not recommended on label

    • Balan – low rate, 6 weeks

    • Rubigan – cost limits use to greens

    • Prograss – greenup issue

    • TranXit and Revolver – 2 weeks before seeding


Bermudagrass Transition Issues

  • Heat tolerance of ryegrass

  • Renegade ryegrass

  • Poa trivialis liveslonger than expected

  • Competition to bermudagrass

  • Long-term effects on bermudagrass

  • When do you accelerate transition?


Bermudagrass Growth

  • When do you accelerate transition?

    • Minimal root growth < 50 F. soil temp.

    • Optimum root growth 75-85 F. soil temp.

    • Shoot growth ceases < 55 F. air temp.

    • Optimum shoot growth 80-95 F.

    • Need night air temps. of mid-60s F.


Accelerating Transition

  • Delay application until bermudagrass is in active spring growth.

  • Know 30 day forecast

  • No green-brown-green!! (on most sites)

  • Need green-green


Slow – 4 to 6 wks

Kerb

Embark (repeats)

Cultural techniques

Fast – 10 to 30 days

Katana

TranXit

Manor

Revolver

Momentum

Battalion

Bermudagrass Transition Options


Health and vigor of bermudagrass is exceedingly important to a smooth transition.


Questions ????????


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