Weed Management Practices for Sports Fields
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Weed Management Practices for Sports FieldsAlec KowalewskiTurfgrass Specialist Oregon State University [email protected]
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Weed Management Practices for Sports Fields• Integrated Pest Management (IPM)
• Primary Cultural Practices • Mowing • Fertilization• Irrigation
• Cultivation and inter-seeding
• Management of…• False dandelion • White clover • Annual bluegrass
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Primary Cultural Practices
1. Mowing2. Fertilizing 3. Irrigation
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Primary Cultural Practices
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Ferti
lizer
Mow
ing
Irrigation
Turfgrass
Primary Cultural Practices
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Mow
ing
Irrigation
Primary Cultural Practices
Turfgrass
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Mowing
Irrigation
Primary Cultural Practices
Turfg
rass
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Ferti
lizer
Mow
ing
Irrigation
Turfgrass
Primary Cultural Practices
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MOWING
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6”
4”
4.5”
3” 3”
2”1.5”
1”
Des
ired
Mow
ing
Hei
ght
Mow
ing
foll
owin
g 1
/3 R
ule
Mowing• The one-third rule
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Mowing • The one-third rule
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Mowing• The one-third rule• Prevent scalping
• Scalping…• Causes a brown appearance• Stops growth and development• Depletes carbohydrates• Makes turf susceptible to environmental stress
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Sunlight
4”
Sunlight
3”
Mowing • The one-third rule• Prevent weed seed germination
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Mowing
Sunlight Sunlight
4”
2”
• The one-third rule• Prevent weed seed germination
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Mowing• Raise your mowing height• Adhere to the one-third rule• Improve rooting
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Mowing• Raise your mowing height• Prevent weed seed germination
Sunlight Sunlight
4”
2”
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Mowing• Raise your mowing height
• Raising the height from 1.5” to 3.0”• Improved turfgrass quality • Reduced weed populations• Crabgrass cover by up to 52% • Dandelion populations by up to 45%• White clover by up to 58%
Kentucky bluegrass, perennial ryegrass and fine fescue mixture
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Mowing
Ragweed Garlic mustard
• Increase your mowing frequency • Adhere to the one-third rule • Increase turfgrass density• Weed control
• Lambsquarter• Ragweed• Purslane• Garlic mustard
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Mowing
35 days
• Increase your mowing frequency • Adhere to the one-third rule • Increase turfgrass density• Weed control
• Lambsquarter• Ragweed• Purslane• Garlic mustard
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Mowing
42 days
• Increase your mowing frequency • Adhere to the one-third rule • Increase turfgrass density• Weed control
• Lambsquarter• Ragweed• Purslane• Garlic mustard
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Mowing
49 days
• Increase your mowing frequency • Adhere to the one-third rule • Increase turfgrass density• Weed control
• Lambsquarter• Ragweed• Purslane• Garlic mustard
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Mowing • Weeds that indicate your mowing height is to low…• Annual bluegrass• Crabgrass • Dandelion
Crabgrass
Annual bluegrass
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MOWING
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FERTILIZATION
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Fertilization• Select a fertilizer designed for turfgrass• Primary nutrient (N-P-K)
• High N• Low P• 10:1
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Fertilization• The holiday plan• 3-5 lbs N 1000 ft2 year
• Memorial day • 1.0-1.5 lbs N 1000 ft2
• 4th of July • 0.5-1.0 lbs N 1000 ft2
• Labor day• 0.5-1.0 lbs N 1000 ft2
• Thanksgiving• 1.0-1.5 lbs 1000 ft2
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Fertilization• The holiday plan• Cool-season turfgrass species
• Kentucky bluegrass• Perennial ryegrass• Fine fescue• Tall fescue
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Fertilization
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Fertilization • Low fertility weeds include…• White clover• Plantain • Black medic
White clover
PlantainBlack medic
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FERTILIZATION
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IRRIGATION
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Irrigation • Adjust your rates with the seasons • Spring
• 0.0-0.75 inch week• Summer
• 0.75-1.5 inch week• Fall
• 0.0-0.75 inch week
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Irrigation• Check your rates• 20 minutes
• 0.1 inch• 0.25 inch• 0.5 inch
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Irrigation• Twice as much is not twice as good• Moss
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Irrigation• Twice as much is not twice as good• Increased disease incidence
Dollar spot Pythium blight Brown patch
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• Twice as much is not twice as good• Leaching pesticides and fertilizers• Waste of water and money
Irrigation
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• Weeds associated with drought conditions… • Summer annuals
• Knotweed • Wood sorrel • Crabgrass
Irrigation
Crabgrass
Knotweed woodsorrel
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Irrigation • Weeds associated with over irrigation…• Annual bluegrass• Rough bluegrass
Rough bluegrass
Annual bluegrass
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IRRIGATION
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CULTIVATION & INTER-SEEDING
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Cultivation• What is your objective when cultivating the turfgrass?
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Cultivation• Objectives • Relive compaction
• Improves gas exchange and drainage• Remove organic matter
• Decreases potential for disease• Improves drainage
• Prepare for seeding• Ensures seed to soil contact
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Cultivation
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Cultivation
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Cultivation • Annual weeds • Annual bluegrass (winter annual)• Crabgrass (summer annual)• Purse lane (summer annual)• Knotweed
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Cultivation • Annual weeds • Annual bluegrass (winter annual)• Crabgrass (summer annual)• Purse lane (summer annual)• Knotweed
Summer annual germination
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Cultivation • Annual weeds • Annual bluegrass (winter annual)• Crabgrass (summer annual)• Purse lane (summer annual)• Knotweed
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Cultivation • Annual weeds• Pre-emergent herbicides
• Non-selective • Pendulum (a.i. pendimethalin)
• $54/54,000 sq ft
• Selective • Tupersan (a.i. siduron) • Tenacity (a.i. mesotrione)
• $98/54,000 sq ft
• Inter-seeding • $1,440/54,000 sq ft
• 600 lbs
Knotweed – Summer annual
Fall – After 1st frost
Non-selective pre-emergent herbicide. Applied in the spring.
No inter-seeding.
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Cultivation • Annual weeds• Pre-emergent herbicides
• Non-selective • Pendulum (a.i. pendimethalin)
• $54/54,000 sq ft
• Selective • Tupersan (a.i. siduron) • Tenacity (a.i. mesotrione)
• $98/54,000 sq ft
• Inter-seeding • $1,440/54,000 sq ft
• 600 lbs
Knotweed – Summer annual
Fall – After 1st frost
Non-selective pre-emergent herbicide. Applied in the spring.
No inter-seeding.
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Inter-seeding • Perennial ryegrass• Growth habit
• Bunch type
• Germination • 7 to 10 days
• Inter-seeding rate• 8 to 11 lbs/1,000 sq ft
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CULTIVATION & INTER-SEEDING
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WEED MANAGEMENT
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Weed Management • Common turf weeds…• 1. false dandelion• 2. white clover • 5. annual bluegrass
False dandelion White clover Annual bluegrass
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FALSE DANDELION
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False dandelion• Scouting and ID • Perennial weed • Spring seeding • Drought tolerant
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False dandelion• Post emergence herbicides (curative)• 3-way broadleaf herbicide
• 2,4-D• MCPP• Dicamba
Common dandelion Broadleaf plantain Sow thistle
False dandelion
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• Apply in the fall (October 4 = 10/4 Good Buddy)
False dandelion
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• Apply in the fall (October 4 = 10/4 Good Buddy)
False dandelion
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False dandelion• Follow up applications… • Apply and then apply again 2-4 weeks later
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Effects of Defendor and Dimension on catsear dandelion in perennial ryegrass, observed 8 weeks after Spring treatment in Corvallis. OR on July 2, 2013.
• **Trt 6. Rotation:• 1st app Dimension 2 EW + Defendor (1.0 + 0.25 pt/A)• 2nd app Dimension 2 EW + Trimec Classic (1.0 + 4.0 pt/A)
Trt Treatments*% Weed Control
8 WAT1 Dimension 2 EW 0.02 Dimension 2 EW + 4Wks 0.03 Defendor 93.94 Defendor + 4 wks 100.05 Dimension 2 EW + Defendor 93.36 Rotation (See Below)** 100.07 Trimec Classic + Dimension 2 EW + 4 Wks 100.08 Trimec Classic 92.59 Untreated 0.0
LSD 4.6
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Effects of Defendor and Dimension on catsear dandelion in perennial ryegrass, observed 8 weeks after Spring treatment in Corvallis. OR on July 2, 2013.
• **Trt 6. Rotation:• 1st app Dimension 2 EW + Defendor (1.0 + 0.25 pt/A) • 2nd app Dimension 2 EW + Trimec Classic (1.0 + 4.0 pt/A)
Trt Treatments*% Weed Control
8 WAT1 Dimension 2 EW 0.02 Dimension 2 EW + 4Wks 0.03 Defendor 93.94 Defendor + 4 wks 100.05 Dimension 2 EW + Defendor 93.36 Rotation (See Below)** 100.07 Trimec Classic + Dimension 2 EW + 4 Wks 100.08 Trimec Classic 92.59 Untreated 0.0
LSD 4.6
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FALSE DANDELION
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WHITE CLOVER
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White clover• Perennial weed• Nitrogen deficient soil• White flower • Circular leaves
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White clover• Post emergence herbicides (curative)• Triclopyr • Fluroxypyr• 2,4-D + triclopyr
Chickweed English daisy Wild violet
White clover
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• Apply in the fall (October 4 = 10/4 Good Buddy)• Apply and then apply again 2-4 weeks later
False dandelion
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WHITE CLOVER
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ANNUAL BLUEGRASS
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• Initiated Summer 2010• Lewis Brown Turf Farm, Corvallis, OR
Spreading ryegrass trial
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• Seeding date: June 15, 2010 • Seeding rate: 6 lbs/1,000 ft2
• Fertility rate: 4 lbs N/1,000 ft2
Spreading ryegrass trial
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• Mowing height • 0.625”• 1.25”• 2.0”
Spreading ryegrass trial
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Annual bluegrass encroachment‘SR 4600’
‘Fiesta 4’
‘Natural Knit’
‘RPR’
0.625”
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Lorenz Soccer Field, Corvallis, OR
‘SR4600’ maintained at 0.625”. Seeded 2011.
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Lorenz Soccer Field, Corvallis, OR
‘SR4600’ maintained at 0.625”. Seeded 2011.
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Some preemergence herbicides effective on annual bluegrass include…
Common name active ingredientPendulum pendimethalin
Prograss ethofumesateBalan benefin
Bensumec bensulideDimension dithiopyr
Quali-Pro Prodiamine prodiamine
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Product Cost of Product
Apps Total
Pendulum $54.00 2 $108.00Prograss $297.00 3 $891.00
Grand Total $999.00
Estimated costs of a Pre/Postemergence Chemical Control Program of Annual bluegrass on a 54,000 ft2 field. It is important to note that cost can vary considerably according to product and control is often variable.
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OSU Softball Complex, Corvallis, OR
Mixed stand of perennial ryegrass and annual bluegrass, 10 years plus
![Page 80: Weed Management Practices for Sports Fields](https://reader033.fdocuments.us/reader033/viewer/2022052321/5552b9e5b4c9052e568b535d/html5/thumbnails/80.jpg)
OSU Softball Complex, Corvallis, OR
Mixed stand of perennial ryegrass and annual bluegrass, 10 years plus
![Page 81: Weed Management Practices for Sports Fields](https://reader033.fdocuments.us/reader033/viewer/2022052321/5552b9e5b4c9052e568b535d/html5/thumbnails/81.jpg)
OSU Softball Complex, Corvallis, OR
Mixed stand of perennial ryegrass and annual bluegrass, 10 years plus
![Page 82: Weed Management Practices for Sports Fields](https://reader033.fdocuments.us/reader033/viewer/2022052321/5552b9e5b4c9052e568b535d/html5/thumbnails/82.jpg)
Annual bluegrass encroachment
Lorenz field Seeded 2011
OSU Softball Seeded 2000
![Page 83: Weed Management Practices for Sports Fields](https://reader033.fdocuments.us/reader033/viewer/2022052321/5552b9e5b4c9052e568b535d/html5/thumbnails/83.jpg)
Annual bluegrass encroachment
Lorenz field Seeded 2011
OSU Softball Seeded 2000
![Page 84: Weed Management Practices for Sports Fields](https://reader033.fdocuments.us/reader033/viewer/2022052321/5552b9e5b4c9052e568b535d/html5/thumbnails/84.jpg)
Weed Management Practices for Sports FieldsAlec KowalewskiTurfgrass Specialist Oregon State University [email protected]