performers. For instance, LPI group 2, (New Jersey and Michigan locations), and LPI group 4 (Indiana and Washington locations) had Chewings fescues PPG- FRC 127, PPG-FRC 130, and DLFPS-FRC-3105 in the top spots. And both LPI groups 5 and 6 showed strong creeping red fescues STB1 and 5Z2 as the highest turf quality performers, followed by several other strong creepers and Chewings fescues. Several ancillary trial locations were initiated with
data collected from some of these sites in 2021. Te Fort Collins, CO, location was managed with saline irrigation, but few statistical differences were noted. Trials were planted under tree shade in Newark, DE, and Ames, IA, but statistical significance among entries was negligible. Data collected in future years will hopefully separate these entries. Fairway mowing tolerance of entries in this
trial was evaluated at St. Paul, MN. Chewings fescues PPG-FRC 127, BAR FRC 130, Brittany 2, and NAI- CHU1, along with Sword II (hard fescue) were the best performers. And under simulated traffic at Amherst, MA, both Chewings fescues (PPG-FRC 127, PPG-FRC-130, and Brittany 2), and hard fescues (Gladiator, DLFPS- FL-3104, and PPG-FL 128, among others) finished in the top statistical group. Two important diseases were evaluated in 2021.
Leaf spot damage (various species) was significant at New Brunswick, NJ, with hard fescues PVF-PDB-2020, DLFPS-FL-3104, and DA5-RHF, strong creeping red fescue PPG-FRR-134, and Chewings fescue DLFPS- FRC-3105 performing best. Pythium blight (Pythium spp.) developed during establishment at Kennett Square, PA, and hard fescues Tenacious and PPG-FL 128 had the lowest infection rate (1.0 percent).
Bentgrass New trials of bentgrass were established in fall
2020 with the first data released in spring 2022. Two species are included in these trials: creeping (Agrostis stolonifera) and colonial (Agrostis tenius). Te first-year summary is now available on our website and is the basis for the bentgrass discussion that follows.
Putting Green Trial Tis trial, containing twenty creeping bentgrasses,
was established at nine standard trial locations and ten ancillary trial locations. Turfgrass quality ratings collected throughout year one of the trial have revealed several new cultivars that can exceed the quality delivered by previous top performers such as Declaration and Penn A-1. In two LPI groups, encompassing data from ten locations, statistical significance was not large, but Piranha, PST- 0HR, 007XL, and Oakley finished with high turfgrass quality ratings.
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Ancillary trials of reduced fungicides, traffic, and
golf course use were conducted at a limited number of sites. PST-0HR was statistically superior to all other entries in traffic evaluations conducted at Amherst, MA, in 2021. Te West Lafayette, IN, site managed their trial by reducing fungicide use, resulting in LNS 19, DLFPS-AP-3084, Piper, 007XL, Oakley, PVF-PV-1, and PST-0DSF landing in the top statistical turf quality group. Tis trial was also evaluated ‘on-site’ at four golf
courses, Olympia Fields Country Club in Olympia Fields, IL, Shadow Glen Golf Club in Olathe, KS, Karsten Creek Country Club in Stillwater, OK, and Tokatee Golf Club in McKenzie Bridge, OR. No single entry was a top performer at all four of these diverse locations. Te top turfgrass quality performers at Olympia Fields include LNS 19 and PVF-PV-2, while Barracuda and Oakley were the highest scoring entries at Shadow Glen G. C. Top finishers in 2022 at Karsten Creek were PS-T0HR and PSU-CBG3, and at Tokatee Golf Club, Piranha, Penncross, and Piper were top performers. Disease ratings were collected at several locations
in year one, but only small statistical differences were noted. Terefore, it seems that much of the statistical significance is a result of density improvements. Piper, PST-0HR, and PSU-CBG1 demonstrated increased summer and fall density in 2022, especially compared to Piranha, a previous highly rated cultivar for density.
Fairway/Tee Trial Te 2020 trial provides data on new experimental
entries that may become commercialized in the future. Tis latest trial consists of eighteen creeping entries and one colonial bentgrass entry, planted at eight standard trial locations and seven ancillary trial locations. Turfgrass quality analyzed was divided into two
LPI groups, with only small statistical separation among entries. Several new entries delivered promising results, however, Penncross, the well-established standard finished as a top for turfgrass quality at two locations, possibly due to superior seedling establishment. Density ratings had an impact on quality scores as Piper and PST-0MRN were top statistical group entries in both spring and fall ratings. Disease resistance is an important feature of any
fairway or tee bentgrass and is a major need for golf course superintendents. Brown patch and dollar spot were major diseases noted over the trial period. Brown patch data collected at two locations showed the creeping bentgrass entries with the best tolerance overall, as entries such as PST-0MRN, PVF-PV-2, and PVF-PV-1 exhibited very little disease. Dollar spot rated at four locations showed the colonial bentgrass Musket at the top (7.2, scale is 1-9, 9=no disease. LSD=0.7). Also in that top statistical group for dollar spot is the creeping bentgrass Spectrum (6.8).
TPI Turf News July/August 2022
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