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Yukon Bermuda Grass VS Riviera Bermuda Grass
For Sports Fields

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Here we do a comparison of Yukon Bermuda Grass Seed and Riviera Bermuda grass Seed as far as usage in sports fields. To show one is better than the other is not the easiest thing to do, as they have many similar traits. However, there are some sports-related traits such as DIVOT repair that give YUKON an advantage over Riviera.

Yukon Bermuda Grass

Yukon Seed Vs Riviera Seed & Germination

Yukon Bermuda Grass Seed and Rivera Bermuda Grass Seed were developed and tested in the colder harsher environment of Oklahoma. Thus developing a bermuda grass that is more tolerant of cold weather than in the Southern USA.

Both bermuda grasses are only partially hulled - mostly un-hulled seed that is then coated. Both varieties naturally have tightly attached hulls that are difficult to remove without damaging the seed. This is also evident when we look at establishment times - both varieties sprout and establish a few days slower than the bermuda grass seed varieties developed in the southwestern USA.

Riviera does have one advantage - once the seeds germinate - the Yukon seedlings sit and wait a week or more before they start to expand and spread, while Riviera seedlings start to move and stolonize sooner.

Yukon VS Riviera Product Test Data

Look at the data sets on the newly revamped Yukon tech sheet below, and at the NTEP site for full reports if you need more details. In some trial locations for some specific traits Yukon beats Riviera, other locations for some traits Riviera beats Yukon and in most trials they are side-by-side for most traits. The same developer and researcher bred both varieties at Oklahoma State, so for many traits and performance abilities they are fairly similar. YUKON was developed with financial backing from the USGA - uncertain about Riviera. On the tech sheets below, Yukon edges out Riviera on most traits.

http://www.sroseed.com/Products/PDF/Yukon_TS.pdf

Shear Strength Rankings of Yukon, Rivera & LaPRIMA XD Bermuda Grass

SHEAR STRENGTH research done at VIRGINIA TECH- shear strength shows results for grass varieties that don't give way when a sports player turns fast on a field. Weak or low ranked grasses give way and tear, and the player twists or breaks an ankle as his cleats lose their grip on the tearing grass. Greater shear strength = much better for sports field use, as the grass doesn't tear and give way.

Yukon Bermuda Grass is ranked much, much better for shear strength than Riviera which ranked way at the bottom. You will also note that LaPaloma Bermuda Grass outranks both Yukon & Riviera in these studies -- making LaPaloma a good choice for sports fields in addition to Yukon -- the main difference being that the turf quality of Yukon exceeds that of LaPaloma by quite a noticeable difference.

LaPaloma & Yukon seed can be found blended in the LaPrima XD Bermuda Grass Seed Blend which is an excellent choice for sports fields. LaPrima combines the shear strength of LaPaloma bermuda grass -- protecting sports players with the turf quality of Yukon Bermuda Grass.

Divot Repair Results

DIVOT REPAIR - this ties in with recovery from wear and tear on a sports field, as well as the ability to cover up damaged spots such as on golf tees and fairways where a divot is ripped out. YUKON beats out RIVIERA for speed of recovery from divot damage, a significant trait for a sports facility.

http://www.sroseed.com/resources/pdfs/articles/Recovery_Bermudagrass Divots.pdf

http://www.plantmanagementnetwork.org/pub/ats/research/2005/divot/

General Comparisons Between Yukon and Rivera Bermuda Grass

In general Yukon is somewhat finer and more dense than Riviera, plus Yukon almost always gets a somewhat higher rating for darker green color than Riviera. Looking through the NTEP, as well as other trials, and Leah, John & Mike's personal observations Yukon is finer, denser and darker green.

Both varieties green up earlier in spring than any other seeded bermuda grass, with YUKON usually greening up slightly earlier than Riviera, depending on the trials site.

YUKON is slower growing than Riviera (needs less mowing), but also slower to fill in with initial seeding.

YUKON greens up 2 to 4 weeks earlier in spring than Riviera, while Riviera greens up 2 weeks earlier than most other bermuda varieties.

YUKON usually stays green longer in the fall than Riviera – 2 to 4 weeks longer – this is more noticeable in cooler climate or transitional zones.

SEEDLING SALT Germination - Yukon was in this trial, Riviera was not as this was pre-Riviera release. YUKON showed significantly higher resistance or tolerance to poor quality water as seedlings.

WATER USE - YUKON was in a trial with other bermuda and zoysia before Riviera was developed - a trial to show ability to retain green color longer under reduced irrigation. YUKON and Princess both showed the ability to maintain green turf color and good turf rating under 25% less irrigation water applied. The trial in Arizona has not been repeated, so it is unknown what Riviera would show for this trait.

SPRING DEAD SPOT DISEASE (this is a disease that has been increasing in occurrence all over the country the last 5+ years)- Yukon has always shown better than Riviera for having less disease. Riviera is better than many other varieties, but not as good as Yukon for this disease. In Spring Dead Spot articles, YUKON is specifically one of the recommended varieties due to it very high disease resistance for this organism.

More Bermuda Grass Variety Comparison Tables

Oklahoma, May 2005 Data Spring Dead Spot Measurements in Sq. Centimeters

Variety sq. cm
Tifway 0.0
Tifsport 0.0
Midlawn 0.0
Ashmore 0.0
Patriot 77.0
Tift No. 4 78.7
Premier 93.0
Yukon 125.3
Aussie Green 304.7
Riviera 401.3
Celebration 571.0
Princess 77 708.7
Contessa 848.0
Southern Star 1161.0
Panama 1168.7
MS-Choice 1171.0
Transcontinental 1337.0
Sunstar 1347.3
Arizona common 1348.3
Sundevil II 1359.0
Numex Sahara 1464.7
Sunbird 1530.0
Mohawk 1547.0
LSD @ 5% 884.0

Mean Spring Dead Spot necrotic patch (sq. cm.) during April 2000, 2001 and 2002.  Plots were inoculated with a blend of Ophiosphaerella herpotricha isolates KS107, KS112 and KS 188 in Sept. 1997.

Variety 2000 2001 2002
Yukon 167 345 678
Patriot 377 754 766
Tifsport 473 927 996
Shanghai 779 1207 1277
Riviera 795 1116 1595
Mirage 747 1626 1923
Blackjack 751 1372 2035
Tifgreen 486 1118 2125
Savannah 717 1731 2186
Arizona Common 622 1791 2221
Southern Star 809 1753 2263
Sundevil II 637 1555 2289
Blue Muda 806 1835 2377
Sahara 618 1734 2416
Sydney 834 1257 2642
Tifway 469 1133 2754
Pyramid 1093 2417 2886
Majestic 1081 2531 3096
Princess 77 1947 3727 3312
LSD @ 5% 698 1096 1129

Turfgrass Quality Ratings of Bermudagrass Cultivars Grown at 11 Locations in the U.S. Maintained using "Schedule B"; 2005 Data Turfgrass Quality Ratings 1-9; 9=Ideal Turf.

Variety Mean
Tifway (veg.) 6.3
Yukon 5.8
Riviera 5.8
Princess 77 5.5
LaPaloma 5.3
Sunbird 5.3
Southern Star 5.3
Transcontinental 5.2
Sunstar 5.0
Mohawk 5.0
Sundevil II 5.0
Numex Sahara 4.9
Arizona Common 4.9
Panama 4.9
LSD @5% 0.3

Turfgrass Quality Ratings of Bermudagrass Cultivars Grown at 9 Locations in the Transition Region 2005 Data Turfgrass Quality Ratings 1-9; 9= Ideal Turf
 

Variety Mean
Tifway (veg.) 6.7
Yukon 6.3
Riviera 6.3
Sunbird 5.6
Princess 77 5.6
Transcontinental 5.5
LaPaloma 5.4
Southern Star 5.3
Panama 5.1
Sundevil II 5.1
Sunstar 5.0
Mohawk 4.9
Numex Sahara 4.9
Arizona Common 4.5
LSD @ 5% 0.3

Spring Greenup Ratings of Bermudagrass Cultivars Grown at 17 Locations 2005 Data Spring Greenup Ratings 1-9; 9=Completely Green.

Variety Mean
Yukon 5.1
Riviera 5.1
Tifway (veg.) 5.0
Sunbird 4.3
Sundevil II 4.2
LaPaloma 4.1
Transcontinental 4.1
Southern Star 3.9
Mohawk 3.8
Panama 3.8
Numex Sahara 3.8
Arizona common 3.7
Prancess 77 3.4
LSD @ 5% 0.3

Summer Density Ratings of Bermudagrass (Seeded) Cultivars Grown at 12 Locations 2005 Data Density Ratings 1-9; 9=Maximum Density

Variety Mean
Yukon 7.1
Princess 77 7.1
Riviera 6.8
Sunbird 6.3
LaPaloma 6.1
Transcontinental 6.1
Southern Star 6.0
Panama 5.9
Sundevil II 5.9
Sunstar 5.8
Numex Sahara 5.8
Mohawk 5.5
Arizona common 5.4
LSD @ 5% 0.4

 

Genetic Color Ratings of Bermudagrass (Seeded) Cultivars Grown at 18 Locations 2005 Data Genetic Color Ratings 1-9; 9=Dark Green

Variety Mean
Yukon 6.8
Princess 77 6.7
Riviera 6.7
Sunbird 6.5
Southern Star 6.4
LaPaloma 6.4
Sunstar 6.3
Transcontinental 6.3
Sundevil II 6.2
Numex Sahara 6.2
Arizona common 6.1
Mohawk 6.1
Panama 6.0
LSD @ 5% 884.0

Mean Spring Dead Spot Patch Measurements of Bermudagrass (Seeded) Cultivars Oklahoma, May 2005 Data Spring Dead Spot Measurements in Sq. Centimeters

Variety sq. cm.
Yukon 125.3
Riviera 401.3
Princess 77 708.7
Contessa 848.0
Southern Star 1161.0
Panama 1168.7
Transcontinental 1337.0
Sunstar 1347.3
Arizona common 1348.3
Sundevil II 1359.0
Numex Sahara 1464.7
Sunbird 1530.0
Mohawk 1547.0
LSD @ 5% 884.0

Percent Spring Greenup Ratings of Bermudagrass Cultivars Kentucky, 2005 Data Spring Greenup Ratings 100%=Completely Green

Variety %
Patriot 91.3
Yukon 85.0
Tifway (veg.) 75.0
Riviera 66.7
Transcontinental 45.0
Aussie Green 42.3
Tifsport 40.7
Sunbird 37.0
Panama 35.0
Contessa 30.0
Princess 77 29.3
Numex Sahara 25.0
Southern Star 21.3
Sundevil II 21.3
Arizona common 16.7
Sunstar 15.0
Mohawk 10.0
LSD @ 5% 27.7

Bermuda Grass Trails by NTEP

Table 1. Winter kill, spring greenup, genetic color, and texture ratings for the 1997 NTEP Bermudagrass Trial at Stillwater, Oklahoma in 2000.

 

 

 

 

 

 

Winter Kill Ratings1

Spring Greenup Ratings2

Genetic Color Ratings3

Texture Ratings4

 

 

 

 

 

Entry

5 April

24 March

15 May

16 Aug

 

 

 

 

 

AZ Common

43.3

2.6

5.0

5.6

Blackjack

28.3

2.6

5.6

6.0

Blue Muda

35.0

2.6

5.0

6.6

Cardinal

  3.3

6.6

4.0

9.0

CN2-9

23.3

2.6

8.0

8.0

GN-1

46.6

2.3

8.0

6.3

Southern Star (J-1224)

38.3

2.3

6.3

6.0

J-540

35.0

2.3

5.6

6.3

Jackpot

30.0

3.0

5.0

6.6

Majestic

41.6

2.3

5.3

6.0

Midlawn

  5.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0

5.3

7.0

8.0

Mini-verde

38.3

2.0

8.0

8.6

Mirage

30.0

3.0

5.3

6.0

Numex Sahara

33.3

3.6

5.6

5.6

OKC 18-4

18.3

2.3

8.0

7.0

OKC 19-9

13.3

2.6

8.0

8.0

Yukon (OKS 91-11)

18.3

3.6

7.0

7.3

Riviera (OKS 95-1)

15.0

3.6

7.3

7.0

Princess

60.0

1.3

7.0

7.3

PST-R69C

30.0

2.6

6.6

7.0

Pyramid

48.3

1.6

5.0

6.3

Savannah

33.3

2.6

5.3

6.3

Shanghai

43.3

2.0

7.0

5.3

Shangri-La

36.6

3.0

5.6

6.3

Sundevil II

28.3

3.3

5.6

6.3

SW1-11

56.6

1.6

6.0

6.6

Sydney (SW1-7)

38.3

3.0

5.0

6.3

Tifgreen

16.6

4.3

6.6

8.0

Tifsport

23.3

2.6

8.0

8.0

Tifway

20.0

2.0

8.0

8.0

 

 

 

 

 

LSD(p=0.05)5

12.2

1.1

0.7

0.7

 

1Winter kill was rated on a 0-99 scale (0=no winter kill, 99=loss of 99 percent of turf area).

2Spring greenup was rated on a 1-9 scale (1=completely dormant, 9=completely green).

3Genetic color was rated on a 1-9 scale (1=light green, 9=dark green).

4Texture was rated on a 1-9 scale (1=coarse texture, 9=fine texture).

5If the difference between any two means in a column is equal to or greater than the LSD value, the means are statistically different.

Comparing YUKON & RIVIERA for Northern / Transition Area use.
Yukon is also an excellent home lawn choice
and can be used in all WARM Growing areas where
Bermuda is normally planted.

Performance Of Yukon Bermuda Grass

Yukon has expanded the bermudagrass planting zone - it is the turfgrass professional's top choice for projects from the Equator to the Transition zones of the world. In trials, it has shown excellent turf quality and winter hardiness at both 0.5 inch and 1.5 inch mowing heights. Yukon has consistently outperformed other seeded turf bermudagrasses in the NTEP trials, as well as other test sites across the United States and overseas.

Golf superintendents, parks and sports field managers, landscapers, as well as other quality turf professionals will find this improved turf-type seeded bermudagrass an advanced performer.

Yukon can be seeded on new projects, as well as interseeded into existing turf of similar quality. Highest ratings for turfgrass quality, color, density and texture, rank Yukon Bermudagrass as the best choice for turf managers, wherever bermudagrass is grown. Additionally, with its excellent winter survival and cold tolerance, Yukon becomes a stand-alone choice for transition zone plantings.

Benefits of Yukon Bermuda Grass

  • Early Spring Green-up
  • Top NTEP ratings for turf quality
  • Higher stolon density
  • Uniform, dark green color
  • Short internodes
  • Ultra dense, ultra fine texture
  • Superb winter hardiness
  • Outstanding drought tolerance
  • Spring Dead Spot resistance
  • Excellent alternative to sprigs & sod
  • Reduced vertical growth
  • Increased Fall color retention

Planting & Establishment of Yukon Bermuda Grass

  • Seed new turf: 2-3 pounds per 1,000 square feet or 90-125 pounds per acre
  • Seedling Emergence: 7-10 days
  • First Mowing: Approximately 21 days
  • Full coverage: 30 days
  • First limited use: 60-90 days

View National Rankings in NTEP Trials.
Yukon has outperformed
other seeded turf bermudagrass in the NTEP trials, as well as other turf test sites across the United States and overseas.

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