Transcript Texas Bluegrass - Seed Research of Oregon

Texas Hybrid Bluegrass
Bill Dunn
Improving Turfgrass Through Research
Texas x Kentucky bluegrass
Many first hybrids poor germination
Thermal Blue = HB 129 = BH00-6002
Reveille sod type good performance
Improved establishment
High shear strength
Excellent rhizomes = good recovery
Good wear tolerance in Ohio - not high Rutgers
Additional new hybrids with good establishment,
high drought tolerance
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Bluegrass Needs
• Improved establishment
• Less dormancy by selection and large seed
• Priming?
• Diverse portfolio of bluegrass types from many programs
• Heat and drought tolerance, winter-active growth
• One set of genetics or one type leads to potential problems
for long term performance
• Necrotic ring spot, summer patch and dollar spot
resistance. Billbugs major problem in drought.
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Bluegrass Strategies
• Texas X Kentucky bluegrass hybrids
• Advantages
• Heat tolerant
• Drought tolerant
• Extensive rhizomes - wear tolerance, sod strength,
recovery
• Goals
• Improved seed fertility - higher yields
• Improved germination
• Summer patch, brown patch and leaf spot resistance
• Reject 3 of 4 potential cultivars
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Texas X Kentucky bluegrass
• Texas bluegrass heat and drought tolerant, extensive and
deep rhizomes
• Kentucky bluegrass turf quality
• Backcrossed to Kentucky bluegrass
• More extensive rhizomes
• Greater heat and drought tolerance
• Must evaluate for diseases, billbug resistance, germination
vigor, apomixis
• 4 new ones optioned from Rutgers planted fall, 2005
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Texas X Kentucky bluegrass
• Rhizomes on young
spaced plants
• Deep rhizomes contribute
to recovery
• Bluegrass usage further
south
• Top rated for shear
strength NTEP
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Bandera Texas X Kentucky
• Improved germination
• High heat tolerance
• Active summer growth
• Need more growth before
vernalization for seed
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Bandera Texas X Kentucky
Bandera
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STR 2844 Texas X Kentucky
• Dark Green, high turf quality
• Cross BDF (Texas X Kentucky) X Midnight
• Excellent seed set and yields
• Low ergot
• Extensive rhizomes
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Texas X Kentucky Bluegrasses
• Blend with tall fescues
– Heat and drought tolerance
– Excellent rhizomes
• Blend with Kentucky bluegrass
– Select Kentucky bluegrasses with improved heat
tolerance
– Similar growth form
• Blend with Texas X Kentucky - future
– Select ones with different genetics
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Texas X Kentucky Bluegrasses
2000 Kentucky bluegrass NTEP Drought and Heat Data
Bluegrass
NJ1 Drought-
WY1 Drought-
KS Turf OH - Turf Quality UT - Turf quality
Wilting -2001
Wilting-2002
Quality
Variety
Type
SR 2284
America
6.7
5.0
5.7
6.7
5.4
Midnight
Midnight
6.0
7.3
4.6
6.9
5.3
Rampart
Julia
4.0
5.3
5.6
3.9
5.2
Kingfisher
America
7.0
6.7
5.0
6.8
5.1
Showcase
America
7.3
6.0
4.7
6.1
5.0
Quantum Leap
Midnight
4.3
7.0
4.3
6.7
5.0
BH 00-6002 (ThBl) Texas hybrid 7.0
5.0
5.0
6.2
4.9
Arcadia
Midnight
5.7
6.0
2.3
6.6
4.8
BH 00-6003
Texas hybrid 3.7
6.3
3.9
4.4
4.8
Cheetah
Aggressive
5.3
4.3
4.4
6.1
4.7
Ulysses
Julia
4.3
6.0
4.4
4.6
4.7
Envicta
BVMG
6.7
5.3
3.6
5.7
4.7
1.6
2.3
3.8
1.2
1.5
LSD@5%
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No irrigation
Low maintenance
Heat tolerant bluegrasses
Cutlivar
STR 2485 KBG
STR 23180 KBG
STR 23064 KBG
Bandera T x K
Y2K-169 KBG
Julia KBG
SR 2109 KBG
2004 Bluegrass Trial, Rolesville, NC
2005 data, 1-9, 9 = Ideal Turf
Mean
Cultivar
6.2
Midnight KBG
6.0
Julius KBG
5.7
Diva KBG
5.6
Rhythm KBG
5.3
Eagleton KBG
5.2
A99-LM15 T x K
5.0
LSD@5%
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Mean
4.8
4.8
4.7
4.6
3.8
3.7
0.7