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

Weed Management on Athletic Fields

Tim R. Murphy

Crop and Soil Sciences

The University of Georgia


Athletic field agronomic problems

Athletic Field - Agronomic Problems

  • Excessive wear and damage

  • Lack of recovery time

  • Compaction

  • Poor drainage


Athletic fields people problems

Athletic Fields - People Problems

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

  • Poor maintenance practices

  • Untrained maintenance personnel

  • Constant use schedules

  • Low budgets - high expectations


Weed management on athletic fields

Hit or Miss

Or

A Planned Program


Practical tips

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

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 athletic fields1

Bermudagrass Athletic Fields


Bermudagrass the big three

Bermudagrass - The Big Three

  • Simazine (Princep, Wynstar, etc.)

  • MSMA or DSMA

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


Bermudagrass summer

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

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

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

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

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

Dithiopyr

  • Dimension

  • MOA is similar to dinitroanilines

    • Shoot and root absorbed, no translocation

    • Inhibit cell division (tubulin formation)


Dna root inhibition

DNA Root inhibition

Dimension on bermudagrass

Surflan on St. Augustinegrass

pendimethalin on zoysiagrass

Swollen, club shaped roots prevent “rooting down”


More practical tips

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

Problem Athletic Field Weeds

  • Annual Bluegrass

  • Goosegrass, Crabgrass

  • Dallisgrass

  • Sedge(s)


Annual bluegrass

Annual Bluegrass

  • Fall preemergence

  • late-Nov. - atrazine, simazine

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

  • Dormant period - Roundup Pro, Finale


Non overseeded bermudagrass

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

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

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

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


Weed management on athletic fields

Green (perennial) kyllinga


Kyllinga spp kyllinga spp

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

Kyllinga spp. - Control

  • Image

  • Image + MSMA

  • Manage

  • Monument

  • Continued applications of MSMA/DSMA

  • Repeat applications will be needed


Msma dsma cma

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

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 msma1

Dallisgrass Control with MSMA

  • 1976 - late July

  • 1977 - August 1

  • 7 day intervals


Overseeded bermudagrass

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 bermudagrass1

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

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

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

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


Bermudagrass transition options

Slow – 4 to 6 wks

Kerb

Embark (repeats)

Cultural techniques

Fast – 10 to 30 days

Katana

TranXit

Manor

Revolver

Momentum

Battalion

Bermudagrass Transition Options


Weed management on athletic fields

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


Weed management on athletic fields

Questions ????????


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