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8/2/2019 10 Turfgrass Renovation
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Turfgrass Renovation
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Turfgrass Renovation
Improving existinglawns by
overseeding Same timing as
establishing a newlawn
Identify the cause ofdamaged or thinnedturf
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Reasons for Turfgrass Failure
Improper cultural practices
Drought, heat, or cold stresses
Weeds, insects, or diseases Excessive thatch
Intermingled layer of living (tillers/stolons) & deadroots and stems that accumlate between the soil
surface & green vegetation. Unfavorable growth environment (shade,
poor soil conditions)
General neglect, abuse, or overuse
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Turfgrass Renovation
Select a turfimprovement
program that willbest upgrade theturf
Take into
considerationsexisting conditions
Desired turf quality
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Turf Improvement Programs1. Initiate a program of sound cultural
practices
2. Renovate turf by planting into existing liveor dead vegetation
3. Totally reestablish the turf area
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Assessment Determine
Turfgrasses present
Soil conditions (fertility, pH, and drainage/aeration)
Thatch levels
Environmental conditions (light quantity, quality,and duration)
Existing perennial grassy weeds
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Program 1
Sound Cultural Practices Acceptable
characteristics, but
in undesirablecondition
Alter turfmanagement
practices to bring toacceptable quality
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Successful ProgramExisting turf must have:
acceptable turf species/cultivar
adequate density (potential for) acceptable soil conditions
thatch level of or less
small number of perennial grassy weeds
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ImplementationIntegrate the following practices to bring turf intodesired condition:
mowingirrigation
fertilization
cultivationpest control practices
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Program 2
Partial Renovation Often, poor turf requires
more than improved culturalpractices
Planting new seed intoexisting live or dead turfprovides:
Better turf appearance
Density
Disease/insect resistance Wear tolerance
Shade/drought tolerance
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Successful ProgramShould have proper:
soil drainage/aeration
pH fertility
thatch levels less than
small number of perennial grassy weeds if large number, apply nonselective herbicide
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Implementation1a. Overseeding into live
turf - mow short andremove debris to
reduce canopycompetition forgerminating seeds
1b.Overseeding into deadturf - use nonselectiveherbicide to killvegetation then mow toremove debris
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Implementation2. Open soil to enhance seed-soil contact via:
hand raking
vertical mowing Used to reduced thatch accumulation
core aerification
Method of soil cultivation that results in removal of soilcores (plugs)
slit seeding
Seeding into core aerification holes
3. If not slit seeding, broadcast seed
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Implementation4. Incorporate seed
with a drag mat orrake
5. Mulch
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Implementation6. Irrigate daily until
germination complete
7. Mow once turf reachesthe intended height ofcut
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Program 3
Complete Renovation Sometimes turf so poor
or the environment isunsuitable to support
turf growth
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Successful ProgramThis drastic method is
necessary when:
soil conditions unsuitable tosustain turf growth
thatch levels greater than and uncontrollable
existing vegetationunacceptable and cant beimproved
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Implementation1. Use a non-selective, short
residual herbicide likeglyphosate (Roundup) orglufosinate (Finale) to kill
existing turf and weeds Effectiveness of herbicides
enhanced by: Skipping a mowing prior
to treatment
AND
Apply to actively growingturf
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Implementation2. Correct soil pH, drainage, and/or fertility
problems by properly preparing the planting
bed3. Seeding or sodding can be initiated 3-5
days after treatment with non-selectiveherbicides
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Post-Renovation Care Once renovated turf has been seeded, turf
should be maintained as if it was a newly
established turf
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Complete renovation:
Kill/dethatch/reseed
Partial renovation:
Dethatch/overseed
If you have a good grade but want to put in a different grass, a completerenovation is sometimes the best way to go. If you just want to bolster the
existing turf, you can use a partial renovation.
17 d ft l ti
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17 days after planting
Sod
SeedDethatched
Seed
Killed/dethatched
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Overseeding
Warm-Season Turfgrass In subtropical climates some warm-season grasses
are overseeded during the fall with cool-seasongrasses
Improves appearance
Playability
Reduces injury from traffic
Most common on greens and tees
Also fairways and homelawns
Perennial ryegrass and rough bluegrass primarilyused
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Preseeding Preparation1. Reduce or eliminate nitrogen fertilization 4-6
weeks preceding overseeding.
2. Eliminate irrigation 3-4 weeks prior tooverseeding
3. Control weeds (apply products 50-90 days prior tooverseeding).
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Timing Numerous recommendations exist for timing
of overseeding of warm-season turfgrass
with cool-season turfgrass:1. Overseed 20-30 days before first killing frost.
2. When daytime highs are in the low 70s.
3. When soil temperatures at the 4 depth is
between 72-78oF.
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Seeding RatesPerennial Ryegrass:
Putting greens: 30-35 lbs per 1000 sq.ft.
Athletic fields: 20 lbs per 1000 sq.ft. Homelawns: 10 lbs per 1000 sq.ft.
Rough Bluegrass: 10 lbs per 1000 sq.ft.
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Postplanting Procedures1. Topdress lightly to smooth the surface.
2. Irrigate frequently until turf establishes.
3. Application of fungicide may be necessary forpythium control.
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Suggested Reading
Chapter 9; pgs 165-168
Chapter 19 - Improving Unsatisfactory
Turf
Practical Lawn Establishment andRenovation, Tom Cook