Information
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Patent Grant
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PP7831
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Patent Number
PP7,831
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Date Filed
Friday, June 22, 199035 years ago
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Date Issued
Tuesday, March 17, 199233 years ago
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Inventors
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Original Assignees
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Examiners
Agents
- Jones, Day, Reavis & Pogue
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US Classifications
Field of Search
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International Classifications
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Abstract
A variety of Kentucky Bluegrass having a high level of disease resistance, good turf performance, and a very high level of seed yield potential.
Description
BACKGROUND
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 VARIETY
The 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 DRAWING
FIG. 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 VARIETY
Ba 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______________________________________Seed Measurements of Ba 73-626 and Other BluegrassVarieties After Conditioning. Length WidthVariety (mm) (mm)______________________________________Ba 73-626 2.98 0.80Abbey 3.18 0.88Coventry 2.86 0.78Estate 2.53 0.76Chateau 2.77 0.80Baron 3.07 0.86Bristol 2.73 0.80Nassau 2.96 0.78Newport 2.76 0.71Park 3.04 0.72Ram I 3.51 0.84Victa 3.20 0.86LSD (.05) 0.19 0.06______________________________________
TABLE 2______________________________________Comparison of Seed Numbers Per Pound of Ba 73-626and Other Bluegrass Varieties After Conditioning. Number of Seeds Per Pound______________________________________Ba 73-626 921,166Abbey 1,003,037Coventry 1,246,200Estate 1,275,740Chateau 1,300,105Adelphi 1,383,976America 1,659,824Gnome 1,017,641Baron 1,051,693Birka 1,223,530Bonnieblue 1,135,303Bristol 1,270,821Eclipse 1,335,668Fylking 1,130,000Glade 1,108,441Kenblue 1,463,923Merit 1,109,728Nassau 1,127,130Newport 1,226,481Park 1,248,349Sydsport 1,355,644Vantage 1,555,303Victa 1,038,298Windsor 1,520,885______________________________________
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______________________________________Morphological Comparison of Panicles of Ba 73-626and Other Bluegrass Varieties in the Greenhouseat Marysville, Ohio. No. of Panicle Panicle Whorls No. of Branches Panicle Length Width Per Lower ThirdVariety Nodding* (cm) (cm) Panicle Whorl Whorl______________________________________Ba 73-626 1.3 9.7 6.0 5.5 4.5 3.4Abbey 1.4 7.6 4.2 5.2 4.0 2.7Baron 1.0 7.8 4.1 5.2 3.8 2.5Bristol 2.0 9.7 5.0 5.0 3.3 2.7Chateau 2.0 6.8 3.8 5.0 4.0 2.4Coventry 2.0 6.7 3.7 4.8 3.8 2.7Estate 1.2 7.5 4.2 5.5 4.0 3.0Nassau 2.0 10.0 6.0 5.0 3.0 2.0Newport 2.0 10.3 4.4 4.5 2.3 2.3Park 1.6 9.0 3.7 4.0 4.3 3.7Ram I 2.0 9.0 4.7 4.0 2.5 2.0Victa 1.2 7.5 4.1 5.4 4.4 3.4LSD (.05) 0.5 1.6 1.0 0.8 0.7 0.8______________________________________ *Panicle nodding rated: 1 = erect, 2 = nodding
TABLE 4______________________________________Morphological Comparison of Spikelets of Ba 73-626and Other Bluegrass Varieties in the Greenhouseat Marysville, Ohio. Spikelet No. of Florets Length (mm) per Spikelet Lowest Third Lowest ThirdVariety Whorl Whorl Whorl Whorl______________________________________Ba 73-626 5.8 5.6 4.4 4.1Abbey 5.1 5.0 3.9 3.8Baron 5.0 5.0 3.7 3.8Bristol 6.2 6.0 5.7 5.3Chateau 5.1 5.0 4.2 3.9Coventry 5.2 5.2 4.2 4.0Estate 5.2 5.0 4.2 4.2Nassau 4.6 4.6 4.5 4.5Newport 5.3 5.2 5.2 5.2Park 6.5 6.7 5.2 4.7Ram I 4.7 5.2 5.2 5.5Victa 5.2 5.0 3.8 3.8LSD (.05) 0.9 0.8 1.1 1.0______________________________________
TABLE 5______________________________________Morphological Comparison of Glumes of Ba 73-626and Other Bluegrass Varieties in the Greenhouseat Marysville, Ohio. Glume Length (mm) Outer Inner Lowest Third Lowest ThirdVariety Whorl Whorl Whorl Whorl______________________________________Ba 73-626 3.2 3.3 3.7 3.6Abbey 2.9 2.9 3.3 3.3Baron 2.9 2.8 3.4 3.3Bristol 3.4 3.3 3.7 3.9Chateau 3.1 3.1 3.4 3.4Coventry 3.2 3.1 3.5 3.5Estate 2.9 3.0 3.3 3.3Nassau 2.3 2.4 2.7 2.7Newport 2.6 2.5 2.9 2.9Park 3.0 3.2 3.5 3.7Ram I 2.6 2.4 2.9 2.7Victa 2.8 3.0 3.3 3.3LSD (.05) 0.5 0.4 0.4 0.4______________________________________
TABLE 6______________________________________Morphological Comparison of Flag Leaves of Ba 73-626and Other Bluegrass Varieties in the Greenhouse atMarysville, Ohio. Flag Leaf Flag Leaf Flag Leaf Length Width ThicknessVariety (cm) (mm) (mm)______________________________________Ba 73-626 5.8 4.2 0.119Abbey 4.3 3.3 0.107Baron 4.5 3.2 0.119Bristol 5.5 3.4 0.127Chateau 4.1 3.2 0.111Coventry 4.7 3.2 0.112Estate 5.2 3.6 0.117Nassau 6.2 3.1 0.127Newport 6.1 3.5 0.135Park 4.2 2.6 0.110Ram I 4.7 3.1 0.127Victa 5.9 4.0 0.124LSD (.05) 1.8 0.6 0.013______________________________________
TABLE 7______________________________________Morphological Comparison of Peduncles, Culms, andInternodes of Ba 73-626 and Other BluegrassVarieties in the Greenhouse at Marysville, Ohio. No. of Top Peduncle Peduncle Culm Nodes Internode Length Width Length Per LengthVariety (cm) (mm) (mm) Culm (cm)______________________________________Ba 73-626 12.3 0.772 514 2.3 12.4Abbey 10.6 0.564 421 2.7 9.3Baron 12.7 0.555 482 2.5 10.1Bristol 15.0 0.677 522 2.7 11.3Chateau 12.9 0.654 439 2.7 9.8Coventry 13.2 0.607 435 2.7 10.2Estate 12.6 0.552 486 2.2 10.5Nassau 8.0 0.546 450 2.5 11.2Newport 18.0 0.567 547 2.3 11.2Park 14.3 0.779 578 3.0 13.0Ram I 18.5 0.622 527 3.0 10.2Victa 12.2 0.716 474 2.4 10.6LSD (.05) 3.7 0.018 79 0.6 2.1______________________________________
TABLE 8______________________________________Morphological Comparison of Leaves of Ba 73-626 andOther Bluegrass Varieties in the Greenhouse atMarysville, Ohio. Ligule Leaf Leaf Leaf Angle Length Length Width (DegreesVariety (mm) (mm) (mm) From Horizontal)______________________________________Ba 73-626 0.29 215 4.4 46Abbey 0.23 218 3.9 56Baron 0.30 313 4.4 63Bristol 0.30 253 4.3 37Chateau 0.25 204 4.1 50Coventry 0.26 218 4.1 55Estate 0.28 239 4.4 52Nassau 0.22 226 3.5 39Newport 0.22 251 4.1 50Park 0.33 329 4.2 44Ram I 0.18 188 3.7 40Victa 0.28 235 4.3 52LSD (.05) 0.11 49 0.6 10______________________________________
TABLE 9______________________________________Morphological Comparison of Leaf Hairs of Ba 73-626and Other Bluegrass Varieties in the Greenhouse atMarysville, Ohio. Hairs Around Ligule on Upper Surface Hairs on Hairs onVariety of the Leaf.sup.(a) Collar.sup.(a) Ligule.sup.(b)______________________________________Ba 73-626 1.2 4.2 3.6Abbey 1.0 3.4 2.2Baron 1.0 5.0 4.0Bristol 1.3 4.7 4.3Chateau 1.0 3.5 2.7Coventry 1.0 3.5 1.5Estate 1.0 3.2 1.3Nassau 2.7 5.0 1.0Newport 1.0 4.0 0.8Park 1.0 1.7 0.0Ram I 1.0 3.7 0.3Victa 1.0 3.3 2.2LSD (.05) 0.3 1.4 1.8______________________________________ .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______________________________________Morphological Comparisons of Ba 73-626 and OtherBluegrass Varieties Grown as Unmowed Spaced Plantsin the Field at Marysville, Ohio.MaturePlant Height.sup.(a) Panicle Density.sup.(b) Maturity.sup.(c)______________________________________Ba 73-626 50 5 8Abbey 49 5 7Baron 44 5 9Coventry 48 5 7Nassau 46 6 9Bristol 54 3 8Merit 61 5 9Glade 49 2 9Ram I 49 3 7Victa 54 6 8______________________________________ 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__________________________________________________________________________A Comparison of Turf Quality.sup.(a) of Ba 73-626and Other Bluegrass Varieties at Various TestingLocations in the United States Testing LocationsVariety 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 6.1Abbey 3.8 7.1 5.8 5.2 5.2 6.8 5.7 6.3 5.7Able I 4.2 6.6 5.9 4.8 4.4 6.8 5.3 6.0 5.5Amazon 3.5 6.9 6.4 6.2 4.4 5.0 4.8 4.9 5.3America 4.3 7.3 6.8 4.9 4.8 6.8 5.0 5.8 5.7Aquila 3.5 5.9 5.7 5.3 4.1 6.7 6.3 6.1 5.5A-34 3.5 7.4 6.7 6.3 4.4 6.8 5.5 4.3 5.6Baron 5.2 7.5 6.0 4.8 4.6 6.8 5.6 5.3 5.7Barzan 4.2 7.1 4.9 3.5 4.4 7.0 5.2 5.5 5.2Bristol 3.7 7.5 6.7 5.3 4.4 6.6 4.7 6.0 5.6Chateau 4.8 7.4 6.8 4.4 5.0 6.1 6.2 5.5 5.8Classic 3.5 7.2 6.0 5.5 4.2 6.6 5.8 5.2 5.5Coventry 3.8 7.2 6.6 5.1 5.0 6.5 5.5 5.2 5.6Estate 4.7 7.0 6.6 5.3 4.7 6.5 5.8 5.8 5.8Georgetown 3.8 7.0 5.9 4.5 4.5 6.4 5.4 4.7 5.3Glade 3.8 7.7 6.6 3.8 4.8 7.0 5.7 5.3 5.6Gnome 4.3 6.9 5.4 5.1 4.7 6.5 5.4 5.4 5.5Haga 3.8 7.1 6.2 5.6 5.0 6.6 5.2 4.5 5.5Julia 3.7 6.7 6.4 5.4 4.7 5.5 6.0 5.5 5.5Kenblue 4.2 4.8 4.8 3.6 3.7 6.0 4.9 3.7 5.5Liberty 3.8 7.1 5.9 4.8 4.5 6.4 5.2 5.1 5.4Merion 4.0 7.0 5.9 3.7 4.3 6.6 5.9 4.8 5.3Merit 5.2 7.4 6.2 4.2 4.6 7.0 5.6 5.7 5.7Midnight 3.7 8.1 6.8 4.7 4.7 7.1 6.3 6.9 6.0Monopoly 4.7 6.5 5.1 5.2 4.9 6.9 5.3 4.7 5.4Mystic 4.2 6.2 6.4 3.8 3.4 7.2 5.7 5.4 5.3Nassau 3.5 7.7 6.4 4.7 4.7 6.1 5.3 5.3 5.5Parade 3.7 7.3 5.6 4.8 3.8 6.2 6.0 4.6 5.3Ram I 4.2 6.5 6.6 4.9 4.8 5.8 5.3 6.0 5.5Rugby 3.8 7.0 6.0 4.7 4.4 6.4 5.6 4.8 5.3Sydsport 3.8 7.5 6.6 4.4 5.3 6.2 5.1 5.0 5.5Victa 5.0 7.5 6.3 4.1 5.2 6.8 6.0 6.0 5.9Wabash 4.5 6.7 5.9 5.1 4.1 6.8 6.0 4.0 5.4Welcome 3.7 6.7 6.3 3.7 4.5 6.9 5.4 5.5 5.3LSD 0.05 1.1 0.7 1.0 1.7 0.8 0.7 1.0 1.1__________________________________________________________________________ .sup.(a) Rating Scale 1-9: 9 = best quality
TABLE 12______________________________________A Comparison of Turf Color.sup.(a) of Ba 73-626 andOther Bluegrass Varieties at Various TestingLocations in the United States. Wichita Post Falls Silver SpringsVariety Kansas Idaho Maryland______________________________________Ba 73-626 7.3 8.0 8.0Abbey 8.0 7.7 6.7Able I 8.3 7.3 7.3Adelphi 7.7Amazon 6.0 7.3 7.7America 8.3 7.7Aquila 8.0 6.0 6.7A-34 6.7 6.3 5.7Baron 7.7 7.7 8.3Barzan 7.0 6.7 8.0Bristol 8.3 8.0 7.3Chateau 7.3 7.0 7.0Classic 6.0 7.0 6.3Coventry 7.3 7.0 7.3Estate 7.3 7.0 6.7Georgetown 6.7 7.0 6.3Glade 7.7 7.7 8.0Gnome 7.3 8.0 7.0Haga 6.3 7.0 5.7Julia 7.3 7.7 7.7Kenblue 6.0 6.7 6.0Liberty 7.7 6.7 6.7Merion 7.7 5.3 7.0Merit 7.0 8.0 7.0Midnight 8.7 8.0 8.3Monopoly 5.3 6.0 6.0Mystic 7.3 6.7 7.3Nassau 7.7 7.3 7.7Parade 7.3 7.3 6.3Ram I 8.0 8.0 8.3Rugby 7.0 6.0 6.0Sydsport 8.0 7.3 7.0Victa 8.0 8.0 8.0Wabash 6.3 6.0 6.0Welcome 7.0 6.7 7.3LSD (.05) 1.0 1.5 0.9______________________________________ .sup.(a) Rating Scale 1- 9: 9 = best color
TABLE 13______________________________________Winter Color.sup.(a) of Ba 73-626 and Other BluegrassVarieties Testing Locations Puyallup AgassizVariety Washington British Columbia______________________________________Ba 73-626 6.0 4.7Abbey 5.7 4.7Able I 7.0 4.0Amazon 2.7 4.0America 6.3 4.0Aquila 4.0 4.0A-34 6.0Baron 4.7 4.7Barzan 2.0 5.0Bristol 8.0 5.0Chateau 4.3 5.0Classic 6.3 4.0Coventry 4.7 5.0Estate 4.0 5.0Georgetown 5.7 4.0Glade 6.0 4.3Gnome 5.7 4.3Haga 6.0 4.0Julia 6.0 5.0Kenblue 1.3 3.0Liberty 6.7Merion 6.3 4.0Merit 5.7 5.0Midnight 6.3 4.7Monopoly 6.0 4.7Mystic 1.3 2.7Nassau 7.3 5.0Parade 6.0 4.0Ram I 3.7 4.7Rugby 5.7 4.3Sydsport 4.3 5.0Victa 6.7 5.0Wabash 3.3 3.3Welcome 1.3 5.0LSD 0.05 1.6 0.6______________________________________ .sup.(a) Rating Scale: 1-9 Larger number indicates greener color
TABLE 14______________________________________Comparison of Seedling Vigor.sup.(a) of Ba 73-626 and OtherBluegrasses Testing LocationVariety Ritzville, Washington______________________________________Ba 73-626 3.0Abbey 1.3Able I 1.7Amazon 1.7America 1.7Aquila 1.3A-34 2.3Baron 2.0Barzan 2.7Bristol 2.7Chateau 1.7Classic 2.3Coventry 2.3Estate 1.3Georgetown 2.0Glade 2.0Gnome 2.3Haga 2.3Julia 1.7Kenblue 1.3Liberty 1.7Merion 1.3Merit 1.3Midnight 1.0Monopoly 2.0Mystic 2.7Nassau 2.0Parade 1.0Ram I 2.0Rugby 1.7Sydsport 1.7Victa 3.0Wabash 1.0Welcome 1.7LSD 0.05 1.3______________________________________ .sup.(a) Rating Scale: 1-9 9 = most vigor
TABLE 15______________________________________Comparison of Drought and Heat Tolerance.sup.(a) ofBa 73-626 and Other Bluegrasses Testing Locations Post Falls MarysvilleVariety Idaho Ohio______________________________________Ba 73-626 7.7 6.3Abbey 7.7 6.3Able I 7.7Adelphi 5.7Amazon 7.0America 8.0Aquila 7.3A-34 6.0Baron 7.0 6.0Barzan 6.0Bonnieblue 6.0Bristol 6.7 6.0Chateau 7.0 6.0Classic 7.3 5.3Coventry 7.3 6.0Estate 7.0 6.0Georgetown 6.7 4.7Glade 6.7 6.3Gnome 8.0 6.3Haga 6.7Julia 7.3Kenblue 6.3Liberty 7.7Merion 7.3 5.0Merit 8.0 6.0Midnight 6.0Monopoly 6.7Mystic 7.7Nassau 8.0 6.0Newport 6.0Parade 5.7Park 5.0Ram I 8.7 6.0Rugby 7.0Sydsport 7.0Vantage 6.0Victa 7.7Wabash 6.7 4.0Welcome 7.3LSD 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 andOther Bluegrasses Under Mowed Conditions Testing Locations Puyallup AgassizVariety Washington British Columbia______________________________________Ba 73-626 3.7 5.3Abbey 5.3 5.7Able I 7.7 6.0Amazon 6.0 6.3America 7.7 6.0Aquila 7.0 6.0A-34 6.7 5.7Baron 4.3 6.0Barzan 5.7 6.0Bristol 6.0 5.0Chateau 4.3 5.7Classic 7.3 6.0Coventry 4.3 5.3Estate 4.7 5.7Georgetown 8.0 5.3Glade 6.7 6.0Gnome 5.3 5.3Haga 7.7 6.0Julia 6.0 6.0Kenblue 5.3 6.7Liberty 6.0Merion 8.0 6.0Merit 4.0 6.0Midnight 6.0 6.0Monopoly 7.0 6.0Mystic 6.0 7.3Nassau 7.0 5.0Parade 7.0 6.0Ram I 6.3 6.3Rugby 6.3 6.0Sydsport 5.0 6.0Victa 3.3 5.7Wabash 7.0 6.3Welcome 6.3 6.0LSD 0.05 1.4 0.6______________________________________ .sup.(a) Rating Scale 1-9 9 = finest leaf
TABLE 17______________________________________A Comparison of the Average Spring and SummerDensity.sup.(a) of Ba 73-626 and Other Bluegrasses atVarious Locations.sup.(b)Variety Spring Summer______________________________________Ba 73-626 6.1 7.2Abbey 6.3 7.2Baron 6.1 7.2Chateau 6.6 7.3Classic 6.9 7.3Coventry 6.7 7.3Estate 6.1 7.3Glade 5.9 7.3Gnone 5.8 6.9Kenblue 5.9 6.8Merion 6.3 6.9Merit 6.0 6.9Midnight 6.1 7.7Nassau 5.7 6.8Parade 6.2 7.3Ram I 6.6 7.3Victa 5.8 7.1LSD 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 OtherBluegrass Varieties in Gervais, OregonVariety Year 1 Year 2 Year 3 Year 4______________________________________Ba 73-626 672 1136 760 1265Abbey 691 1586Bristol 347 808 627 684Chateau 559 757Coventry 643 930Estate 585 864Julia 296 1016Mosa 322 1060Newport 435 1256Victa 780 1394 855 1287LSD 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 andOther Bluegrasses under Mowed Conditions Testing LocationVariety Remington, Virginia______________________________________Ba 73-626 14.3A-34 9.7Able I 8.7Amazon 8.7America 18.7Aquila 16.3Baron 14.7Barzan 8.3Bristol 8.3Chateau 15.0Classic 15.3Coventry 11.0Estate 16.0Georgetown 14.3Glade 18.0Gnome 14.3Haga 13.0Julia 11.0Kenblue 16.3Liberty 11.0Merion 11.3Merit 13.3Midnight 14.3Monopoly 8.3Mystic 14.3Nassau 8.3Parade 12.7Ram I 11.0Rugby 11.7Sydsport 20.7Victa 16.3Wabash 10.3Welcome 18.0LSD (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 onBa 73-626 And Other Bluegrasses Testing Locations Marysville Blacksburg PuyallupVariety Ohio.sup.(a) Virginia.sup.(b) Washington.sup.(b)______________________________________Ba 73-626 8.3 6.0 8.3Abbey 6.0 8.0Able I 4.7 9.0Adelphi 20.0Amazon 5.3 7.0America 5.3 8.7Aquila 4.3 7.3A-34 5.3 8.7Baron 10.0 5.7 8.3Barzan 5.3 3.3Bonnieblue 13.3Bristol 5.7 9.0Chateau 5.7 9.0Classic 5.3 8.7Coventry 11.7 5.7 9.0Estate 5.3 9.0Georgetown 5.7 9.0Glade 11.7 5.5 8.0Gnome 5.7 8.7Haga 5.7 9.0Julia 6.0 9.0Kenblue 2.3 1.0Liberty 5.7 8.7Merion 18.3 6.0 9.0Merit 20.3 6.0 8.3Midnight 5.3 9.0Monopoly 4.7 8.0Mystic 4.7 1.0Nassau 6.0 9.0Newport 46.7Parade 4.3 9.0Park 60.0Ram I 16.7 5.0 5.3Rugby 4.7 9.0Sydsport 11.7 6.3 9.0Vantage 45.0Victa 15.0 6.0 8.0Wabash 2.3 6.3Welcome 4.3 1.3LSD 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 IdahoVariety Stem Rust Leaf Rust Leaf Rust______________________________________Ba 73-626 7.3 5.7 8.7Abbey 6.3 5.3 8.3Able I 7.0 6.3 8.3Amazon 6.0 5.3 7.7America 8.3 6.0 8.7Aquila 8.0 5.7 7.7A-34 8.0 6.3 7.7Baron 7.3 5.0 8.0Barzan 8.0 5.7 7.7Bristol 8.7 6.0 8.7Chateau 8.3 5.3 8.0Classic 8.7 6.0 9.0Coventry 8.3 5.0 7.3Estate 7.3 5.7 8.0Georgetown 9.0 6.0 8.3Glade 7.7 5.0 8.7Gnome 7.7 5.3 8.3Haga 9.0 6.3 8.3Julia 8.0 5.7 8.0Kenblue 8.3 5.7 7.7Liberty 8.3 6.7 8.0Merion 2.7 4.0 6.7Merit 8.0 5.7 9.0Midnight 8.3 5.7 7.7Monopoly 8.0 5.3 8.3Mystic 5.3 5.7 7.3Nassau 7.7 5.7 8.0Parade 9.0 7.0 7.7Ram I 8.7 6.0 8.7Rugby 8.7 6.7 8.3Sydsport 8.0 5.3 8.3Victa 7.7 4.7 7.3Wabash 8.0 5.3 8.0Welcome 7.3 6.0 8.3LSD 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, NecroticRing Spot and Dollar Spot.sup.(a) Incidence Level onBa 73-626 and Other Bluegrasses at VariousLocations in the United States. Testing Locations West Blacksburg, Lafayette, Hubbard, Virginia Indiana Oregon Columbia, Red Summer Necrotic MissouriVariety Thread Patch Ring Spot Dollarspot______________________________________Ba 73-626 5.7 9.0 6.3 7.7Abbey 6.0 8.0 6.0 6.7Able I 3.7 8.7 7.3 6.3Amazon 3.0 4.3 5.0 5.7America 5.3 9.0 7.0 7.0Aquila 3.7 9.0 6.0 7.7A-34 4.3 8.3 5.0 7.3Baron 4.7 8.7 5.3 7.7Barzan 4.0 8.0 6.0 6.0Bristol 5.7 9.0 6.0 7.3Chateau 4.7 6.7 5.0 6.0Classic 5.0 8.7 4.7 6.7Coventry 5.0 7.3 6.3 7.7Estate 4.3 7.3 6.7 7.3Georgetown 4.7 8.7 5.7 6.7Glade 3.3 9.0 7.0 6.7Gnome 4.0 7.0 6.7 7.7Haga 4.0 9.0 5.3 7.7Julia 3.0 5.3 7.3 6.7Kenblue 2.7 8.3 6.7 7.0Liberty 4.3 8.7 6.0 7.0Merion 3.3 8.0 7.7 7.3Merit 4.0 9.0 6.0 5.0Midnight 5.0 9.0 7.3 5.7Monopoly 5.7 9.0 5.0 7.0Mystic 1.7 9.0 6.7 7.3Nassau 4.3 7.3 6.0 6.0Parade 5.0 7.3 5.0 6.3Ram I 4.3 4.3 7.0 4.3Rugby 4.7 8.7 5.3 7.3Sydsport 4.3 7.3 6.7 6.7Victa 5.7 8.0 6.3 7.0Wabash 3.3 9.0 4.7 5.7Welcome 4.0 8.3 6.0 8.3LSD 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.