Ba 73-626 Kentucky Bluegrass
A variety of Kentucky Bluegrass having a high level of disease resistance, good turf performance, and a very high level of seed yield potential.
Latest The O.M. Scott & Sons Company, Inc. Patents:
Kentucky Bluegrasses having been disclosed in U.S. Plant Pat. No. 3,156 which issued on May 9, 1972; U.S. Plant Pat. No. 3,186 which issued on May 23, 1972; U.S. Plant Pat. No. 4,336 which issued on Nov. 28, 1978; U.S. Plant Pat. No. 6,280 which issued on Sept. 6, 1988; U.S. Plant Pat. No. 6,537 which issued on Jan. 17, 1989; U.S. Plant Pat. No. 6,538 which issued on Jan. 17, 1989; and U.S. Plant Pat. No. 6,585 which issued Feb. 7, 1989.
SUMMARY OF THE VARIETYThe present invention relates to a new and improved variety of Kentucky Bluegrass, Poa pratensis, that has been designated Ba 73-626.
Ba 73-626 plant material originated by crossing a Kentucky Bluegrass plant developed and maintained in the plant nursery as the seed parent with a Kentucky Bluegrass plant selected from PI-198075, a plant introduction from Sweden available from Germplasm Services Laboratory, Beltsville, Md., as the pollen parent. As a result of this breeding, a distinct variety was produced and asexually propagated by rhizomes, tillers and disseminules. Seed of Ba 73-626 was produced first at Marysville, Ohio and later at Gervais, Oreg. This seed was used for purposes of plant turf performance evaluation trials, including those conducted under the auspices of the National Turfgrass Evaluation Program sponsored by the United States Department of Agriculture, Agricultural Research Service and the Maryland State Turfgrass Council.
Asexual reproduction of Ba 73-626 by propagules (tillers and rhizomes) and by disseminules (modified caryopses produced by apomixis) has consistently produced progeny plants indistinguishable from the mother plant. The apomixis level of Ba 73-626 ranged from 100% to 98.8% (mean of 99.4%) based upon examining seedlings from four different crop years under constant growth chamber conditions.
Ba 73-626 has a number of highly desirable characteristics including a good level of resistance to Drechslera spp. (formerly called Helminthosporium spp.) that causes leaf spot, melting out and crown rot; Laetisaria fuciformis that causes red thread; Sclerotinia homoeocarpa that causes dollar spot; Puccinia spp. that causes rust and Phialophora gramincola that causes summer patch (formerly called Fusairum blight). Ba 73-626 has an attractive leafy turf type growth habit; moderately wide leaf blades; attractive green color which can be maintained throughout the entire growing season; good seedling vigor and heat tolerance; good turf performance as evidenced by consistently high scores in National Turfgrass Evaluation Tests sponsored by the United States Department of Agriculture and conducted throughout the U.S.A. and Canada and a very high seed yield potential in the bluegrass seed production region of the U.S.A.
In comparison with most commercially available varieties, the new Ba 73-626 variety has a thicker peduncle, a wider and thicker flag leaf, higher seed yield, wider leaf blades and better winter color. In comparison to the pollen parent, the new variety has fewer seeds per pound, a much higher seed yield and more erect culms of mature unmowed plants.
BRIEF DESCRIPTION OF THE DRAWINGFIG. 1 shows a Ba 73-626 Kentucky Bluegrass plant in the vegetative stage including the extensive root and rhizome system;
FIG. 2 shows a Ba 73-626 Kentucky Bluegrass panicle; and
FIG. 3 shows Ba 73-626 Bluegrass seed.
DETAILED DESCRIPTION OF THE VARIETYBa 73-626 Kentucky Bluegrass (Poa pratensis L.) is perennial with creeping rhizomes forming a moderately dense turf. When plants overwinter in the field with freezing temperatures and are then brought into the greenhouse during late winter to continue growth undisturbed by clipping under moderate temperatures (60.degree.-80.degree. F.), culms are erect averaging 514 mm in length with an average of 2.3 nodes per culm. The uppermost internode averages 12.4 cm, and the peduncle averages 12.3 cm in length, and 0.772 mm in thickness. The flag leaf averages 5.8 cm in length, 4.2 mm in width and 0.119 mm in thickness. The panicle has an average length of 9.7 cm, width of 6.0 cm, and 5.5 whorls. The lowest whorl has an average of 4.5 branches and the third whorl from the bottom of the panicle has an average of 3.4 branches. The average spikelet at the tip of a branch in the lowest whorl is 5.8 mm in length and has 4.4 florets with an outer glume of 3.2 mm and an inner glume of 3.7 mm in length. A similar spikelet from the third whorl from the bottom of the panicle is 5.6 mm in length and has 4.1 florets with an outer glume of 3.3 mm and an inner glume of 3.6 mm in length. After the seed has been conditioned, the lemma has a generally smooth keel with occasional short hairs and a few long fine hairs at the base. The seed of Ba 73-626 is 2.98 mm in length and 0.80 mm in width with approximately 921,166 seeds per pound. Comparisons of Ba 73-626 with other varieties in terms of seed dimensions and seed numbers per pound are shown in Tables 1 and 2 as follows:
TABLE 1
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Seed Measurements of Ba 73-626 and Other Bluegrass
Varieties After Conditioning.
Length Width
Variety (mm) (mm)
______________________________________
Ba 73-626 2.98 0.80
Abbey 3.18 0.88
Coventry 2.86 0.78
Estate 2.53 0.76
Chateau 2.77 0.80
Baron 3.07 0.86
Bristol 2.73 0.80
Nassau 2.96 0.78
Newport 2.76 0.71
Park 3.04 0.72
Ram I 3.51 0.84
Victa 3.20 0.86
LSD (.05) 0.19 0.06
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TABLE 2
______________________________________
Comparison of Seed Numbers Per Pound of Ba 73-626
and Other Bluegrass Varieties After Conditioning.
Number of Seeds
Per Pound
______________________________________
Ba 73-626 921,166
Abbey 1,003,037
Coventry 1,246,200
Estate 1,275,740
Chateau 1,300,105
Adelphi 1,383,976
America 1,659,824
Gnome 1,017,641
Baron 1,051,693
Birka 1,223,530
Bonnieblue 1,135,303
Bristol 1,270,821
Eclipse 1,335,668
Fylking 1,130,000
Glade 1,108,441
Kenblue 1,463,923
Merit 1,109,728
Nassau 1,127,130
Newport 1,226,481
Park 1,248,349
Sydsport 1,355,644
Vantage 1,555,303
Victa 1,038,298
Windsor 1,520,885
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Since environmental conditions such as soil and climate may influence morphological characteristics to some extent, comparisons of morphological characteristics of Ba 73-626 are made with other Kentucky Bluegrass varieties in the following Tables 3-10:
TABLE 3
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Morphological Comparison of Panicles of Ba 73-626
and Other Bluegrass Varieties in the Greenhouse
at Marysville, Ohio.
No. of
Panicle
Panicle Whorls No. of Branches
Panicle Length Width Per Lower Third
Variety Nodding* (cm) (cm) Panicle
Whorl Whorl
______________________________________
Ba 73-626
1.3 9.7 6.0 5.5 4.5 3.4
Abbey 1.4 7.6 4.2 5.2 4.0 2.7
Baron 1.0 7.8 4.1 5.2 3.8 2.5
Bristol 2.0 9.7 5.0 5.0 3.3 2.7
Chateau 2.0 6.8 3.8 5.0 4.0 2.4
Coventry
2.0 6.7 3.7 4.8 3.8 2.7
Estate 1.2 7.5 4.2 5.5 4.0 3.0
Nassau 2.0 10.0 6.0 5.0 3.0 2.0
Newport 2.0 10.3 4.4 4.5 2.3 2.3
Park 1.6 9.0 3.7 4.0 4.3 3.7
Ram I 2.0 9.0 4.7 4.0 2.5 2.0
Victa 1.2 7.5 4.1 5.4 4.4 3.4
LSD (.05)
0.5 1.6 1.0 0.8 0.7 0.8
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*Panicle nodding rated: 1 = erect, 2 = nodding
TABLE 4
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Morphological Comparison of Spikelets of Ba 73-626
and Other Bluegrass Varieties in the Greenhouse
at Marysville, Ohio.
Spikelet No. of Florets
Length (mm) per Spikelet
Lowest Third Lowest
Third
Variety Whorl Whorl Whorl Whorl
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Ba 73-626 5.8 5.6 4.4 4.1
Abbey 5.1 5.0 3.9 3.8
Baron 5.0 5.0 3.7 3.8
Bristol 6.2 6.0 5.7 5.3
Chateau 5.1 5.0 4.2 3.9
Coventry 5.2 5.2 4.2 4.0
Estate 5.2 5.0 4.2 4.2
Nassau 4.6 4.6 4.5 4.5
Newport 5.3 5.2 5.2 5.2
Park 6.5 6.7 5.2 4.7
Ram I 4.7 5.2 5.2 5.5
Victa 5.2 5.0 3.8 3.8
LSD (.05) 0.9 0.8 1.1 1.0
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TABLE 5
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Morphological Comparison of Glumes of Ba 73-626
and Other Bluegrass Varieties in the Greenhouse
at Marysville, Ohio.
Glume Length (mm)
Outer Inner
Lowest Third Lowest
Third
Variety Whorl Whorl Whorl Whorl
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Ba 73-626 3.2 3.3 3.7 3.6
Abbey 2.9 2.9 3.3 3.3
Baron 2.9 2.8 3.4 3.3
Bristol 3.4 3.3 3.7 3.9
Chateau 3.1 3.1 3.4 3.4
Coventry 3.2 3.1 3.5 3.5
Estate 2.9 3.0 3.3 3.3
Nassau 2.3 2.4 2.7 2.7
Newport 2.6 2.5 2.9 2.9
Park 3.0 3.2 3.5 3.7
Ram I 2.6 2.4 2.9 2.7
Victa 2.8 3.0 3.3 3.3
LSD (.05) 0.5 0.4 0.4 0.4
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TABLE 6
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Morphological Comparison of Flag Leaves of Ba 73-626
and Other Bluegrass Varieties in the Greenhouse at
Marysville, Ohio.
Flag Leaf Flag Leaf Flag Leaf
Length Width Thickness
Variety (cm) (mm) (mm)
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Ba 73-626 5.8 4.2 0.119
Abbey 4.3 3.3 0.107
Baron 4.5 3.2 0.119
Bristol 5.5 3.4 0.127
Chateau 4.1 3.2 0.111
Coventry 4.7 3.2 0.112
Estate 5.2 3.6 0.117
Nassau 6.2 3.1 0.127
Newport 6.1 3.5 0.135
Park 4.2 2.6 0.110
Ram I 4.7 3.1 0.127
Victa 5.9 4.0 0.124
LSD (.05) 1.8 0.6 0.013
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TABLE 7
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Morphological Comparison of Peduncles, Culms, and
Internodes of Ba 73-626 and Other Bluegrass
Varieties in the Greenhouse at Marysville, Ohio.
No. of Top
Peduncle Peduncle Culm Nodes Internode
Length Width Length
Per Length
Variety (cm) (mm) (mm) Culm (cm)
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Ba 73-626
12.3 0.772 514 2.3 12.4
Abbey 10.6 0.564 421 2.7 9.3
Baron 12.7 0.555 482 2.5 10.1
Bristol 15.0 0.677 522 2.7 11.3
Chateau 12.9 0.654 439 2.7 9.8
Coventry
13.2 0.607 435 2.7 10.2
Estate 12.6 0.552 486 2.2 10.5
Nassau 8.0 0.546 450 2.5 11.2
Newport 18.0 0.567 547 2.3 11.2
Park 14.3 0.779 578 3.0 13.0
Ram I 18.5 0.622 527 3.0 10.2
Victa 12.2 0.716 474 2.4 10.6
LSD (.05)
3.7 0.018 79 0.6 2.1
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TABLE 8
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Morphological Comparison of Leaves of Ba 73-626 and
Other Bluegrass Varieties in the Greenhouse at
Marysville, Ohio.
Ligule Leaf Leaf Leaf Angle
Length Length Width (Degrees
Variety (mm) (mm) (mm) From Horizontal)
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Ba 73-626
0.29 215 4.4 46
Abbey 0.23 218 3.9 56
Baron 0.30 313 4.4 63
Bristol 0.30 253 4.3 37
Chateau 0.25 204 4.1 50
Coventry 0.26 218 4.1 55
Estate 0.28 239 4.4 52
Nassau 0.22 226 3.5 39
Newport 0.22 251 4.1 50
Park 0.33 329 4.2 44
Ram I 0.18 188 3.7 40
Victa 0.28 235 4.3 52
LSD (.05)
0.11 49 0.6 10
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TABLE 9
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Morphological Comparison of Leaf Hairs of Ba 73-626
and Other Bluegrass Varieties in the Greenhouse at
Marysville, Ohio.
Hairs Around Ligule
on Upper Surface Hairs on Hairs on
Variety of the Leaf.sup.(a)
Collar.sup.(a)
Ligule.sup.(b)
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Ba 73-626
1.2 4.2 3.6
Abbey 1.0 3.4 2.2
Baron 1.0 5.0 4.0
Bristol 1.3 4.7 4.3
Chateau 1.0 3.5 2.7
Coventry
1.0 3.5 1.5
Estate 1.0 3.2 1.3
Nassau 2.7 5.0 1.0
Newport 1.0 4.0 0.8
Park 1.0 1.7 0.0
Ram I 1.0 3.7 0.3
Victa 1.0 3.3 2.2
LSD (.05)
0.3 1.4 1.8
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.sup.(a) Hairs around ligule and on collar rated 1-5: 1 = none, 5 = many
.sup.(b) Hairs on ligule rated 0-5: 0 = none, 5 = many
TABLE 10
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Morphological Comparisons of Ba 73-626 and Other
Bluegrass Varieties Grown as Unmowed Spaced Plants
in the Field at Marysville, Ohio.
Mature
Plant Height.sup.(a)
Panicle Density.sup.(b)
Maturity.sup.(c)
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Ba 73-626
50 5 8
Abbey 49 5 7
Baron 44 5 9
Coventry
48 5 7
Nassau 46 6 9
Bristol 54 3 8
Merit 61 5 9
Glade 49 2 9
Ram I 49 3 7
Victa 54 6 8
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Ratings:
.sup.(a) Mature Plant Height (cm) includes panicle
.sup.(b) Panicle Density 1-10, 10 = high panicle density
.sup.(c) Maturity 1-9, 9 = most mature
No discernible differences were noted in flower parts and seed coloration other than those characteristics listed in the above tables.
Ba 73-626 has performed well in regions throughout the United States, as exhibited by high turf quality ratings in many different locations in comparison with other varieties. In addition, Ba 73-626 has a pleasant medium green color which can be maintained throughout the growing season, good winter color, and early spring greening. Comparisons of Ba 73-626 with other varieties for quality and color are set forth in Tables 11-13 hereinafter. According to comparisons with the Munsell Book for Color during mid-June, the color of Ba 73-626 leaf blades is in the range of 5 GY 4/4 to 5 GY 4/8 to 7.5 GY 4/4. During the same time period the color of similar leaf blades of several other Kentucky Bluegrass varieties--Gnome, Midnight, Bristol and Victa--fell in the same range and as a result were indistinguishable based upon use of this color dictionary. Plant age, time of year, management practices of fertilization, irrigation and mowing also influence this color range. Additional comparisons for seedling vigor, drought tolerance, leaf texture, density, seed yield and sod strength are shown in Tables 14-19.
TABLE 11
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A Comparison of Turf Quality.sup.(a) of Ba 73-626
and Other Bluegrass Varieties at Various Testing
Locations in the United States
Testing Locations
Variety
NC KS OH OK VA IN NE NJ Mean
__________________________________________________________________________
Ba 73-626
5.0
7.5 6.7
5.8 4.9
6.9 6.1
5.8
6.1
Abbey 3.8
7.1 5.8
5.2 5.2
6.8 5.7
6.3
5.7
Able I 4.2
6.6 5.9
4.8 4.4
6.8 5.3
6.0
5.5
Amazon 3.5
6.9 6.4
6.2 4.4
5.0 4.8
4.9
5.3
America
4.3
7.3 6.8
4.9 4.8
6.8 5.0
5.8
5.7
Aquila 3.5
5.9 5.7
5.3 4.1
6.7 6.3
6.1
5.5
A-34 3.5
7.4 6.7
6.3 4.4
6.8 5.5
4.3
5.6
Baron 5.2
7.5 6.0
4.8 4.6
6.8 5.6
5.3
5.7
Barzan 4.2
7.1 4.9
3.5 4.4
7.0 5.2
5.5
5.2
Bristol
3.7
7.5 6.7
5.3 4.4
6.6 4.7
6.0
5.6
Chateau
4.8
7.4 6.8
4.4 5.0
6.1 6.2
5.5
5.8
Classic
3.5
7.2 6.0
5.5 4.2
6.6 5.8
5.2
5.5
Coventry
3.8
7.2 6.6
5.1 5.0
6.5 5.5
5.2
5.6
Estate 4.7
7.0 6.6
5.3 4.7
6.5 5.8
5.8
5.8
Georgetown
3.8
7.0 5.9
4.5 4.5
6.4 5.4
4.7
5.3
Glade 3.8
7.7 6.6
3.8 4.8
7.0 5.7
5.3
5.6
Gnome 4.3
6.9 5.4
5.1 4.7
6.5 5.4
5.4
5.5
Haga 3.8
7.1 6.2
5.6 5.0
6.6 5.2
4.5
5.5
Julia 3.7
6.7 6.4
5.4 4.7
5.5 6.0
5.5
5.5
Kenblue
4.2
4.8 4.8
3.6 3.7
6.0 4.9
3.7
5.5
Liberty
3.8
7.1 5.9
4.8 4.5
6.4 5.2
5.1
5.4
Merion 4.0
7.0 5.9
3.7 4.3
6.6 5.9
4.8
5.3
Merit 5.2
7.4 6.2
4.2 4.6
7.0 5.6
5.7
5.7
Midnight
3.7
8.1 6.8
4.7 4.7
7.1 6.3
6.9
6.0
Monopoly
4.7
6.5 5.1
5.2 4.9
6.9 5.3
4.7
5.4
Mystic 4.2
6.2 6.4
3.8 3.4
7.2 5.7
5.4
5.3
Nassau 3.5
7.7 6.4
4.7 4.7
6.1 5.3
5.3
5.5
Parade 3.7
7.3 5.6
4.8 3.8
6.2 6.0
4.6
5.3
Ram I 4.2
6.5 6.6
4.9 4.8
5.8 5.3
6.0
5.5
Rugby 3.8
7.0 6.0
4.7 4.4
6.4 5.6
4.8
5.3
Sydsport
3.8
7.5 6.6
4.4 5.3
6.2 5.1
5.0
5.5
Victa 5.0
7.5 6.3
4.1 5.2
6.8 6.0
6.0
5.9
Wabash 4.5
6.7 5.9
5.1 4.1
6.8 6.0
4.0
5.4
Welcome
3.7
6.7 6.3
3.7 4.5
6.9 5.4
5.5
5.3
LSD 0.05
1.1
0.7 1.0
1.7 0.8
0.7 1.0
1.1
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.sup.(a) Rating Scale 1-9: 9 = best quality
TABLE 12
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A Comparison of Turf Color.sup.(a) of Ba 73-626 and
Other Bluegrass Varieties at Various Testing
Locations in the United States.
Wichita Post Falls
Silver Springs
Variety Kansas Idaho Maryland
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Ba 73-626
7.3 8.0 8.0
Abbey 8.0 7.7 6.7
Able I 8.3 7.3 7.3
Adelphi 7.7
Amazon 6.0 7.3 7.7
America 8.3 7.7
Aquila 8.0 6.0 6.7
A-34 6.7 6.3 5.7
Baron 7.7 7.7 8.3
Barzan 7.0 6.7 8.0
Bristol 8.3 8.0 7.3
Chateau 7.3 7.0 7.0
Classic 6.0 7.0 6.3
Coventry 7.3 7.0 7.3
Estate 7.3 7.0 6.7
Georgetown
6.7 7.0 6.3
Glade 7.7 7.7 8.0
Gnome 7.3 8.0 7.0
Haga 6.3 7.0 5.7
Julia 7.3 7.7 7.7
Kenblue 6.0 6.7 6.0
Liberty 7.7 6.7 6.7
Merion 7.7 5.3 7.0
Merit 7.0 8.0 7.0
Midnight 8.7 8.0 8.3
Monopoly 5.3 6.0 6.0
Mystic 7.3 6.7 7.3
Nassau 7.7 7.3 7.7
Parade 7.3 7.3 6.3
Ram I 8.0 8.0 8.3
Rugby 7.0 6.0 6.0
Sydsport 8.0 7.3 7.0
Victa 8.0 8.0 8.0
Wabash 6.3 6.0 6.0
Welcome 7.0 6.7 7.3
LSD (.05)
1.0 1.5 0.9
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.sup.(a) Rating Scale 1- 9: 9 = best color
TABLE 13
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Winter Color.sup.(a) of Ba 73-626 and Other Bluegrass
Varieties
Testing Locations
Puyallup Agassiz
Variety Washington
British Columbia
______________________________________
Ba 73-626 6.0 4.7
Abbey 5.7 4.7
Able I 7.0 4.0
Amazon 2.7 4.0
America 6.3 4.0
Aquila 4.0 4.0
A-34 6.0
Baron 4.7 4.7
Barzan 2.0 5.0
Bristol 8.0 5.0
Chateau 4.3 5.0
Classic 6.3 4.0
Coventry 4.7 5.0
Estate 4.0 5.0
Georgetown 5.7 4.0
Glade 6.0 4.3
Gnome 5.7 4.3
Haga 6.0 4.0
Julia 6.0 5.0
Kenblue 1.3 3.0
Liberty 6.7
Merion 6.3 4.0
Merit 5.7 5.0
Midnight 6.3 4.7
Monopoly 6.0 4.7
Mystic 1.3 2.7
Nassau 7.3 5.0
Parade 6.0 4.0
Ram I 3.7 4.7
Rugby 5.7 4.3
Sydsport 4.3 5.0
Victa 6.7 5.0
Wabash 3.3 3.3
Welcome 1.3 5.0
LSD 0.05 1.6 0.6
______________________________________
.sup.(a) Rating Scale: 1-9 Larger number indicates greener color
TABLE 14
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Comparison of Seedling Vigor.sup.(a) of Ba 73-626 and Other
Bluegrasses
Testing Location
Variety Ritzville, Washington
______________________________________
Ba 73-626 3.0
Abbey 1.3
Able I 1.7
Amazon 1.7
America 1.7
Aquila 1.3
A-34 2.3
Baron 2.0
Barzan 2.7
Bristol 2.7
Chateau 1.7
Classic 2.3
Coventry 2.3
Estate 1.3
Georgetown 2.0
Glade 2.0
Gnome 2.3
Haga 2.3
Julia 1.7
Kenblue 1.3
Liberty 1.7
Merion 1.3
Merit 1.3
Midnight 1.0
Monopoly 2.0
Mystic 2.7
Nassau 2.0
Parade 1.0
Ram I 2.0
Rugby 1.7
Sydsport 1.7
Victa 3.0
Wabash 1.0
Welcome 1.7
LSD 0.05 1.3
______________________________________
.sup.(a) Rating Scale: 1-9 9 = most vigor
TABLE 15
______________________________________
Comparison of Drought and Heat Tolerance.sup.(a) of
Ba 73-626 and Other Bluegrasses
Testing Locations
Post Falls
Marysville
Variety Idaho Ohio
______________________________________
Ba 73-626 7.7 6.3
Abbey 7.7 6.3
Able I 7.7
Adelphi 5.7
Amazon 7.0
America 8.0
Aquila 7.3
A-34 6.0
Baron 7.0 6.0
Barzan 6.0
Bonnieblue 6.0
Bristol 6.7 6.0
Chateau 7.0 6.0
Classic 7.3 5.3
Coventry 7.3 6.0
Estate 7.0 6.0
Georgetown 6.7 4.7
Glade 6.7 6.3
Gnome 8.0 6.3
Haga 6.7
Julia 7.3
Kenblue 6.3
Liberty 7.7
Merion 7.3 5.0
Merit 8.0 6.0
Midnight 6.0
Monopoly 6.7
Mystic 7.7
Nassau 8.0 6.0
Newport 6.0
Parade 5.7
Park 5.0
Ram I 8.7 6.0
Rugby 7.0
Sydsport 7.0
Vantage 6.0
Victa 7.7
Wabash 6.7 4.0
Welcome 7.3
LSD 0.05 1.7 0.9
______________________________________
.sup.(a) 1-9 Scale 9 = most tolerant
TABLE 16
______________________________________
Comparison of Leaf Texture.sup.(a) of Ba 73-626 and
Other Bluegrasses Under Mowed Conditions
Testing Locations
Puyallup Agassiz
Variety Washington
British Columbia
______________________________________
Ba 73-626 3.7 5.3
Abbey 5.3 5.7
Able I 7.7 6.0
Amazon 6.0 6.3
America 7.7 6.0
Aquila 7.0 6.0
A-34 6.7 5.7
Baron 4.3 6.0
Barzan 5.7 6.0
Bristol 6.0 5.0
Chateau 4.3 5.7
Classic 7.3 6.0
Coventry 4.3 5.3
Estate 4.7 5.7
Georgetown 8.0 5.3
Glade 6.7 6.0
Gnome 5.3 5.3
Haga 7.7 6.0
Julia 6.0 6.0
Kenblue 5.3 6.7
Liberty 6.0
Merion 8.0 6.0
Merit 4.0 6.0
Midnight 6.0 6.0
Monopoly 7.0 6.0
Mystic 6.0 7.3
Nassau 7.0 5.0
Parade 7.0 6.0
Ram I 6.3 6.3
Rugby 6.3 6.0
Sydsport 5.0 6.0
Victa 3.3 5.7
Wabash 7.0 6.3
Welcome 6.3 6.0
LSD 0.05 1.4 0.6
______________________________________
.sup.(a) Rating Scale 1-9 9 = finest leaf
TABLE 17
______________________________________
A Comparison of the Average Spring and Summer
Density.sup.(a) of Ba 73-626 and Other Bluegrasses at
Various Locations.sup.(b)
Variety Spring Summer
______________________________________
Ba 73-626 6.1 7.2
Abbey 6.3 7.2
Baron 6.1 7.2
Chateau 6.6 7.3
Classic 6.9 7.3
Coventry 6.7 7.3
Estate 6.1 7.3
Glade 5.9 7.3
Gnone 5.8 6.9
Kenblue 5.9 6.8
Merion 6.3 6.9
Merit 6.0 6.9
Midnight 6.1 7.7
Nassau 5.7 6.8
Parade 6.2 7.3
Ram I 6.6 7.3
Victa 5.8 7.1
LSD 0.05 0.8 0.6
______________________________________
.sup.(a) Rating Scale 1-9: 9 = Maximum
.sup.(b) The testing locations were in Indiana, Ohio and Manitoba, Canada
for both spring and summer testing.
TABLE 18
______________________________________
Seed Yield Comparisons.sup.(a) of Ba 73-626 and Other
Bluegrass Varieties in Gervais, Oregon
Variety Year 1 Year 2 Year 3
Year 4
______________________________________
Ba 73-626 672 1136 760 1265
Abbey 691 1586
Bristol 347 808 627 684
Chateau 559 757
Coventry 643 930
Estate 585 864
Julia 296 1016
Mosa 322 1060
Newport 435 1256
Victa 780 1394 855 1287
LSD 0.05 140 134 105 131
______________________________________
.sup.(a) Seed yields: Pounds per acre
TABLE 19
______________________________________
Comparison of Sod Strength.sup.(a) of Ba 73-626 and
Other Bluegrasses under Mowed Conditions
Testing Location
Variety Remington, Virginia
______________________________________
Ba 73-626 14.3
A-34 9.7
Able I 8.7
Amazon 8.7
America 18.7
Aquila 16.3
Baron 14.7
Barzan 8.3
Bristol 8.3
Chateau 15.0
Classic 15.3
Coventry 11.0
Estate 16.0
Georgetown 14.3
Glade 18.0
Gnome 14.3
Haga 13.0
Julia 11.0
Kenblue 16.3
Liberty 11.0
Merion 11.3
Merit 13.3
Midnight 14.3
Monopoly 8.3
Mystic 14.3
Nassau 8.3
Parade 12.7
Ram I 11.0
Rugby 11.7
Sydsport 20.7
Victa 16.3
Wabash 10.3
Welcome 18.0
LSD (0.05) 6.1
______________________________________
.sup.(a) Sod strength measured in kilograms of tension needed to tear sod
Turf diseases are one of the major causes of inconsistent and poor turf performance. Ba 73-626 has been found to have a high level of resistance to leaf spot (also known as melting out and crown rot) caused by Drechslera poae (formerly called Helminthosporium vagans), a medium to high level of resistance to rust caused by Puccinia spp., to dollarspot caused by Sclerotinia homoeocarpa, to red thread caused by Laetisaria fuciformis formerly called Corticium, to summer patch caused by Phialophora graminicola formerly called a Fusarium spp and to necrotic ring spot caused by Leptosphaeria korrae.
Comparisons of Ba 73-626 with other varieties regarding resistance to leaf spot, rust, dollarspot, red thread and summer patch are presented in Tables 20-23.
TABLE 20
______________________________________
Comparison of Leafspot Disease Incidence on
Ba 73-626 And Other Bluegrasses
Testing Locations
Marysville Blacksburg
Puyallup
Variety Ohio.sup.(a)
Virginia.sup.(b)
Washington.sup.(b)
______________________________________
Ba 73-626
8.3 6.0 8.3
Abbey 6.0 8.0
Able I 4.7 9.0
Adelphi 20.0
Amazon 5.3 7.0
America 5.3 8.7
Aquila 4.3 7.3
A-34 5.3 8.7
Baron 10.0 5.7 8.3
Barzan 5.3 3.3
Bonnieblue
13.3
Bristol 5.7 9.0
Chateau 5.7 9.0
Classic 5.3 8.7
Coventry 11.7 5.7 9.0
Estate 5.3 9.0
Georgetown 5.7 9.0
Glade 11.7 5.5 8.0
Gnome 5.7 8.7
Haga 5.7 9.0
Julia 6.0 9.0
Kenblue 2.3 1.0
Liberty 5.7 8.7
Merion 18.3 6.0 9.0
Merit 20.3 6.0 8.3
Midnight 5.3 9.0
Monopoly 4.7 8.0
Mystic 4.7 1.0
Nassau 6.0 9.0
Newport 46.7
Parade 4.3 9.0
Park 60.0
Ram I 16.7 5.0 5.3
Rugby 4.7 9.0
Sydsport 11.7 6.3 9.0
Vantage 45.0
Victa 15.0 6.0 8.0
Wabash 2.3 6.3
Welcome 4.3 1.3
LSD 0.05 17.6 1.1 1.6
______________________________________
.sup.(a) Results expressed in % of turf affected by disease
.sup.(b) Results rated on scale of 1-9: 9 = least disease
TABLE 21
______________________________________
Comparison of Stem and Leaf Rust.sup.(a) (Puccinia spp.)
Disease Incidence on Ba 73-626 and Other Bluegrasses
Testing Locations
Adelphia Riverside Post Falls
New Jersey California
Idaho
Variety Stem Rust Leaf Rust Leaf Rust
______________________________________
Ba 73-626 7.3 5.7 8.7
Abbey 6.3 5.3 8.3
Able I 7.0 6.3 8.3
Amazon 6.0 5.3 7.7
America 8.3 6.0 8.7
Aquila 8.0 5.7 7.7
A-34 8.0 6.3 7.7
Baron 7.3 5.0 8.0
Barzan 8.0 5.7 7.7
Bristol 8.7 6.0 8.7
Chateau 8.3 5.3 8.0
Classic 8.7 6.0 9.0
Coventry 8.3 5.0 7.3
Estate 7.3 5.7 8.0
Georgetown 9.0 6.0 8.3
Glade 7.7 5.0 8.7
Gnome 7.7 5.3 8.3
Haga 9.0 6.3 8.3
Julia 8.0 5.7 8.0
Kenblue 8.3 5.7 7.7
Liberty 8.3 6.7 8.0
Merion 2.7 4.0 6.7
Merit 8.0 5.7 9.0
Midnight 8.3 5.7 7.7
Monopoly 8.0 5.3 8.3
Mystic 5.3 5.7 7.3
Nassau 7.7 5.7 8.0
Parade 9.0 7.0 7.7
Ram I 8.7 6.0 8.7
Rugby 8.7 6.7 8.3
Sydsport 8.0 5.3 8.3
Victa 7.7 4.7 7.3
Wabash 8.0 5.3 8.0
Welcome 7.3 6.0 8.3
LSD 0.05 1.0 1.5 1.4
______________________________________
.sup. (a) Results rated on a scale of 1-9: 9 = least disease
TABLE 22
______________________________________
A Comparison of Red Thread, Summer Patch, Necrotic
Ring Spot and Dollar Spot.sup.(a) Incidence Level on
Ba 73-626 and Other Bluegrasses at Various
Locations in the United States.
Testing Locations
West
Blacksburg,
Lafayette,
Hubbard,
Virginia Indiana Oregon Columbia,
Red Summer Necrotic
Missouri
Variety Thread Patch Ring Spot
Dollarspot
______________________________________
Ba 73-626
5.7 9.0 6.3 7.7
Abbey 6.0 8.0 6.0 6.7
Able I 3.7 8.7 7.3 6.3
Amazon 3.0 4.3 5.0 5.7
America 5.3 9.0 7.0 7.0
Aquila 3.7 9.0 6.0 7.7
A-34 4.3 8.3 5.0 7.3
Baron 4.7 8.7 5.3 7.7
Barzan 4.0 8.0 6.0 6.0
Bristol 5.7 9.0 6.0 7.3
Chateau 4.7 6.7 5.0 6.0
Classic 5.0 8.7 4.7 6.7
Coventry 5.0 7.3 6.3 7.7
Estate 4.3 7.3 6.7 7.3
Georgetown
4.7 8.7 5.7 6.7
Glade 3.3 9.0 7.0 6.7
Gnome 4.0 7.0 6.7 7.7
Haga 4.0 9.0 5.3 7.7
Julia 3.0 5.3 7.3 6.7
Kenblue 2.7 8.3 6.7 7.0
Liberty 4.3 8.7 6.0 7.0
Merion 3.3 8.0 7.7 7.3
Merit 4.0 9.0 6.0 5.0
Midnight 5.0 9.0 7.3 5.7
Monopoly 5.7 9.0 5.0 7.0
Mystic 1.7 9.0 6.7 7.3
Nassau 4.3 7.3 6.0 6.0
Parade 5.0 7.3 5.0 6.3
Ram I 4.3 4.3 7.0 4.3
Rugby 4.7 8.7 5.3 7.3
Sydsport 4.3 7.3 6.7 6.7
Victa 5.7 8.0 6.3 7.0
Wabash 3.3 9.0 4.7 5.7
Welcome 4.0 8.3 6.0 8.3
LSD 0.05 1.4 2.6 1.0 1.9
______________________________________
.sup.(a) Results rated on scale of 1-9: 9 = least disease
Claims
1. A variety of Kentucky Bluegrass plant, substantially as shown and described, characterized by a medium to high level of resistance to several serious diseases, including leaf spot disease, a desirable green color throughout the growing season, a strong sodformer, a high quality dense persistent turf under a wide variety of environmental conditions and a high level of seed yielding capacity.
Type: Grant
Filed: Jun 22, 1990
Date of Patent: Mar 17, 1992
Assignee: The O.M. Scott & Sons Company, Inc. (Marysville, OH)
Inventors: Virgil D. Meier (Marysville, OH), Eugene W. Mayer (Marysville, OH)
Primary Examiner: James R. Feyrer
Law Firm: Jones, Day, Reavis & Pogue
Application Number: 7/542,851
International Classification: A01H 500;
