DLFPS-340/3552, NAI-15-80, and NK-1 with the best resistance. Stem rust ratings from two locations again demonstrated some entry differences, with A11-26, Barserati, A16-17, and DLFPS-340/3552 showing the least disease damage.
Tall Fescue Second year data from our latest tall fescue trial,
established in fall 2018, is now available. Tis new trial contains 132 entries, of which almost all are experimental. Year one data typically reflects establishment rate, with year two data being a better reflection of future performance. Turfgrass quality ratings from 2020 are
Blue Coat Kentucky Bluegrass, a cultivar developed by Columbia River Seed, is shown here growing in one of the company’s production fields. Photo courtesy of Columbia River Seed
Data analyzed by Location Performance Index
Groups resulted in greater statistical differences than past years. Bombay, Starr, Cloud, Barserati, and PPG-KB 1131 performed well overall in each LPI group. Bombay, Starr, and Cloud also performed at the top of turf quality under Schedule “A” (1.5-2.5 inches mowing height, 3-4 lbs./N/1000 sq. ft., irrigation to prevent stress or dormancy) and Schedule “B” (2.5–3.5 inches mowing height, 1 lb./N/1000 sq. ft., no irrigation after establishment) managed locations. Tese same entries also performed consistently well in data analyzed by region in 2020 (Northeast, Transition, North Central, and Upper Mountain/West).
As with past trials, the 2017 Kentucky bluegrass
trial consists of several ancillary locations testing for tolerance to various stresses. Shade tolerance was evaluated at Ames, IA, in 2018, 2019, and 2020, where no statistical differences were noted among entries. Traffic tolerance was evaluated at four locations
in 2020. Finish Line was statistically the top overall entry in quality ratings collected at Amherst, MA, with also the highest wear tolerance ratings. North Brunswick, NJ, simulated traffic for four weeks in summer and four weeks in fall. At the end of the fall traffic season, the top statistical group entries were BAR PP 7K426, Barvette HGT®
, and DLFPS-340/3552. Only small statistical
differences were noted among the entries in traffic data collected at Blacksburg, VA, and Fayetteville, AR. Data on various diseases such as summer patch
(Magnaporthe poae), dollar spot (Clarireedia spp.) and stem rust (Puccinia graminis) were reported again in 2020. Data on summer patch, one of the most devastating diseases on Kentucky bluegrass, was collected at three locations with Barserati, Bombay, A15-6, DLFPS-340/3550, and DLFPS-340/3551 finishing with the highest tolerance ratings. Dollar spot ratings collected at North Brunswick, NJ, identified AKB3241, Blue Gem, DLFPS-340/3551,
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organized and analyzed within five LPI groups and seven geographical regions. Statistical differences were small within the LPI groups, with more statistical separation noted within the regional analyses. Te entries TD2, K18-RS6, Spyder 2LS, and AH2 were among a group of excellent performers finishing in the top statistical group in each of the seven regions. Tolerance to stresses such as traffic, shade, drought,
and brown patch are being evaluated throughout the trial period. Shade data collected at Ames, IA, yielded no statistical separation again in 2020. Similarly, data collected in 2020 from a low mowing height trial (1.5 inches) at Blacksburg, VA, and drought data collected at Logan, UT, did not result in statistical significance. With three more years of trial data, we expect these trials will show interesting results and useful data. Some of these studies initiate after full
establishment, therefore the first significant data was initiated in 2020. Traffic applied at Amherst, MA, yielded good statistical separation with TMT1 and AH1 finishing with some of the highest traffic tolerance ratings, as well as the top turfgrass quality ratings. Intensive traffic was applied on the tall fescue trials at North Brunswick, NJ, during summer 2020. Although statistical differences among entries were small, large differences in ground cover and canopy fullness were noted with some of the best entries maintaining more than 65 percent ground cover after four weeks of traffic damage, versus the poorest performing entries with less than 25 percent ground cover. Entries with the highest ground cover under traffic include Degas, GLX Aced, and RH3. Brown patch (Rhizoctonia solani) is typically the
most prevalent disease on tall fescue, and as is typical, several locations noted and rated the disease in 2020. Year two data yielded more statistical significance for brown patch than year one, with about one-third of the entries performing similar to the top entries. Some of the highest- ranking entries for brown patch in 2020 include Dynamite G-LS, PPG-TF 323, RH3, DLFPS-321/3705, and PPG- TF 316.
TPI Turf News July/August 2021
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