COOL-SEASON
Kentucky Bluegrass A final report of data from 2012-2016 collected
on the 2011 Kentucky bluegrass trial was completed and released by NTEP in fall 2017. A new trial of Kentucky bluegrass was established in 2017; this report focuses on the 2017 trial and its first annual report (2018 data). Typically, first year data strongly reflects rate
of establishment, as well as the performance without significant thatch development. Turfgrass quality ratings are an overall evaluation of monthly entry performance, showing why they are so important to consider. In this first-year summary, we look at locations in the different regions and identify top performers. Data analyzed by Location Performance Index
Groups did not result in large statistical differences. However, data analyzed by region did result in some significant entry differences. GO-2628 is the only entry to finish in the top turf quality statistical group in all four regions (Northeast, Transition, North Central and Upper Mountain/West). Several new entries finished in the top statistical group in three of the four regions including Barserati, GO-2425, J-3510, J-1138 and NAI-13-14, among others. Data analyzed by management schedule
showed several entries that performed well among both management regimes in year one. Schedule “A” replicated a good quality home lawn in most regions (1.5-2.5 inches mowing height, 3-4 lbs./N/1000 sq. ft., irrigation to prevent stress or dormancy) while Schedule “B” approximated a lower input turf area (2.5–3.5 inches mowing height, 1 lb./N/1000 sq. ft., no irrigation after establishment). Entries that performed very well in both Schedule “A” and “B” include GO-2628, GO-22B23, J-1138, GO-2425 and PPG-KB 1304. 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 with no statistical differences apparent among entries, at least in year one. Traffic tolerance was evaluated at Amherst, MA,
and Blacksburg, VA, in 2018. Some of the best entries at Amherst include NAI-14-178, BAR PP 7309V, NAI- 13-9 and PST-11-7. In Blacksburg, DLFPS-340/3455, GO-22B23, LTP-11-41 and Pivot had the highest mean quality score (8.7) in 2018 ratings. Data on various diseases such as summer patch
(Magnaporthe poae), dollar spot (Sclerotinia homeocarpa), crown rust (Puccinia coronata) and stem rust (Puccinia graminis), and pink snow mold (Microdochium nivale) were reported in 2018. Data on summer patch, one of the most devastating diseases on Kentucky bluegrass, was collected
52
: Seed production of an experimental tall fescue at the DLF Research Farm in Philomath, OR.
at two locations, with A10-280, BAR PP 7236V and PPG-KB 1304 showing the least disease. Dollar spot ratings collected at W. Lafayette, IN,
demonstrate a potential for selection of improved tolerance with DLFPS-340/3550 and NK-1 topping the ratings. Stem rust, crown rust and pink snow mold ratings show some entry differences, but data over more locations and several years will be needed to determine if true improved disease tolerance exists.
Tall Fescue With our 2012 tall fescue trial complete, we
now have a final summary report that brings all the years together. Te trial contains 116 entries, of which many are still experimental. Year one data typically reflects establishment rate, year two data usually reflects broader cultivar performance, while years three through five allow us to determine if trends seen in year two are still viable. Tis final summary includes all that info and is the best measure of long-term performance. Turfgrass quality ratings averaged over all
twenty locations revealed several entries including 4th Millennium SRP, Regenerate, Raptor II, MET 1, Amity and Traverse 2 SRP as top performers. Tese same entries, as well as other entries like Titanium LS, Rebounder and Avenger II also performed well in data analyzed either under Schedule “A” maintenance, which approximates a high quality home lawn in many regions (1.5-3 inches mowing height, 3-4 lbs./N/1000 sq. ft., irrigation to prevent stress), or Schedule “B” (2.5-3.5 inches mowing height, 1-2 lbs./N/1000 sq. ft., irrigation to prevent dormancy). In comparing regional data, only 4th Millennium
SRP and Regenerate finished in the top statistical group in all six regional analyses. Te largest separation in performance was noted in data from our Southwest site (Riverside, CA). 4th Millennium SRP, Screamer LS, Maestro, Regenerate, PSG-P01, IS-TF 311 and Technique were the only entries in the top statistical group at Riverside. Data from four Northeast sites also showed good entry separation with many of the
TPI Turf News July/August 2019
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