Ancillary trial testing started in 2020 with 2021 WARM-SEASON Last year’s article reported on first year data
(2020) from our new warm-season trials: bermudagrass, zoysiagrass, and warm-season putting green, all established in 2019. Second year data, collected in 2021, is discussed in this article and is now available online.
Bermudagrass Te 2019 bermuda NTEP trial contains thirteen
(13) seeded entries and twenty-two (22) vegetative entries, established at twenty-one (21) locations across the southeast, Transition Zone, and southwest U.S. Many of these entries are experimental cultivars or new commercial cultivars. NTEP evaluates warm-season grasses by comparing seeded and vegetative entries, also by separately comparing seeded vs. seeded and vegetative vs. vegetative. Turfgrass quality data from eleven standard trial
sites were analyzed. Seeded and vegetative groups were compared separately as well as against each other. As in the past, the best vegetative entries often outperformed the best seeded entries in 2021 turfgrass quality data.
delivering some interesting data. Drought tolerance is being evaluated at both College Station, TX, and Riverside, CA. Tese two sites utilize different methods to impose drought, with College Station eliminating irrigation for a block of time (‘acute’ tolerance) and Riverside managing using a reduced ETo
replacement (‘chronic’ tolerance).
Large statistical difference was noted among entries at Riverside in 2020, and again in 2021, with only TifTuf in the top turf quality statistical group. TifTuf, as well as FB 1628, had the best recovery from drought in 2021 at Riverside. Like 2020, fewer statistical differences were noted in 2021 data from College Station. FB 1628, JSC 77V, and TifTuf finished with the highest quality ratings. In addition, drought dormancy differences were noted among entries, even though statistical differences were again small. Traffic tolerance was collected at Raleigh, NC, and
Knoxville, TN. Small statistical differences were noted at Knoxville, but the Raleigh site saw more entry separation. Te best ground cover at the end of the eight-week fall traffic season was delivered by TifTuf, MSB-1075, SB- 1017, and JSC 77V. Other ancillary trials include salinity tolerance,
shade tolerance, spring dead spot (Ophiosphaerella spp.) tolerance, and divot recovery. In 2021, like 2020, no statistical differences emerged from the Las Cruces, NM, salinity tolerance evaluations. Spring dead spot ratings collected at West Lafayette, IN, did show statistical differences as Astro, Tahoma 31, and JSC 77V showed the least disease. Year two shade evaluations at College Station, TX, delivered overall low-quality ratings (TQ range = 4.6 – 1.9). However, several entries including Tahoma 31, MSB- 1017, and JSC 77V exhibited better tolerance of shade than about one-third of the entries. Divot recovery was rated again at Stillwater, OK,
Te NTEP Bermudagrass trails that began in 2019 include 21 locations spread across the Southeast, Transition Zone, and Southwest U.S.
At six Transition Zone trial locations,
experimental vegetative entries FB 1628 and MSB-1042, joined by commercial entries Tahoma 31, Latitude 36, and TifTuf TM
were consistently good to excellent top
performers. At five sites in the southeastern U.S., FB 1628 and MSB 1050 were top experimentals, but commercially available entries TifTuf, Tahoma 31, and Latitude 36 also performed well. More data will be needed, but it seems that renovating a fairway or athletic field by replacing these existing commercial cultivars with new experimentals may be a difficult decision.
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in 2021. Divots cut in early July were measured regularly throughout the next four weeks to assess speed of fill-in and recovery. Recovery averaged over six ratings varied from 82.9 percent - 66.9 percent (LSD = 6.9). Several seeded entries including OKS2015-7 (82.9 percent), JSC 2013-10S (81.7 percent), JSC 2013-5S (81.6 percent), Tahoma 31 (81.4 percent), Riviera (81.3 percent), and FB 1630 (81.2 percent) demonstrated the fastest recovery from divot injury.
Zoysiagrass Meyer zoysiagrass was released in the early 1950s
and has been a standard in the industry ever since. Meyer is known for its medium leaf texture (for a Zoysia japonica type) and excellent winter hardiness. Zeon is a Zoysia matrella type that is finer textured that Meyer. Zeon is a standard for use on golf course fairways and tees because it can develop a dense turfgrass at mowing heights of 0.5 in. (1.27 cm) or lower. Both grasses are included in this trial as standard entries.
TPI Turf News July/August 2022
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