chewings entries. Riverside, CA, collected data from a trial that is mowed only once or twice a year. Hard fescues Minimus, PST-4BND, Jetty, Sword, and Gladiator, along with creeping red entry DLF-FRR 6162 were the best entries under the infrequently mowed management at Riverside. And the California Golf Club of San Francisco site on a golf course fairway, found SeaMist, Momentum, Beudin, Navigator II, and PST-BEN as the best performing entries. Several diseases were noted and rated at various
locations over the trial period. Leaf spot (various species) was rated at three locations, with the hard fescues Minimus, Resolute, DLFPS-FL/3066, Jetty, and MNHD-14 showing the best resistance. Data on dollar spot was collected at eight locations with a mixture of hard fescues (i.e., Gladiator, Compass II, and Jetty) and chewings fescues (i.e., Bolster, Leeward, and RAD-FC44) showing the best tolerance. Several hard fescues, including Gladiator, Beacon, DLFPS-FL/3066, MNHD-14, and Jetty finished with the highest ratings for red thread tolerance. And Jetty, Minimus, and DLFPS-FL/3066, all hard fescues, were the top summer patch performers.
Bentgrass New trials of bentgrass were established in fall
2020, but the first data will not be released until spring 2022. Terefore, the most recent data available is from the 2014 bentgrass trials, which finished in fall 2019. Two species are included in those trials: creeping (Agrostis stolonifera) and colonial (Agrostis tenius). Te five-year summary compiled from the 2014 trials is 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 nineteen locations. Turfgrass quality ratings collected throughout the five-year trial have revealed several new cultivars that can exceed the quality delivered by previous top performers Declaration, V-8, Penn A-1, and Luminary. MacDonald was the only entry that finished in the top statistical group within each LPI designation for each year, which is quite an accomplishment. Also performing very well overall during the five-year period were Piranha, L-93 XD, 777, and DLFPS-AP/3058. Ancillary trials of reduced irrigation, traffic, and
golf course use were conducted at a limited number of sites. Traffic evaluations conducted at Amherst, MA, from 2015- 2018 showed Pure Eclipse, MacDonald, Tour Pro, and Piranha with the top overall turf quality scores. Te Logan, UT, site managed their trial by reducing irrigation based on ETo
(potential evapotransporation), which resulted
in Piranha, Kingdom, MacDonald, Pure Select, and DLFPS-AP/3058 landing in the top statistical turf quality group.
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Tis trial was also evaluated ‘on-site’ at three golf
courses, Los Angeles Country Club, the California Golf Club of San Francisco, and North Shore Country Club in Glenview, IL. Many NTEP bentgrass trials have been evaluated at North Shore over the years, with excellent results. However, this trial demonstrated very few statistical differences over the trial period. Tis result contrasts with the results seen at other ‘on-site’ locations. Te California Golf Club of San Francisco location ended with Pure Select as the top overall entry, statistically better than all other entries. Te Los Angeles County Club trial also included Pure Select in their top overall group, along with L-93 XD, MacDonald, Piranha, and Shark. Disease ratings were collected at several locations
during the five-year trial. Dollar spot tolerance was rated at eleven locations with L-93XD, Declaration, Tour Pro, and DLFPS-AP/3058 with the highest average ratings. Brown patch and anthracnose (Colletotrichum cereale) were rated at several sites during the trial, but very little statistical differences were noted among entries.
Fairway/Tee Trial With the new 2020 trial just starting, the 2014
trial is the latest five-year summary of data on fairway and tee bentgrass. Te 2014 trial consisted of fourteen creeping and three colonial bentgrass entries and was planted at nineteen locations. Several entries delivered excellent performance
across LPI groups and in different years of this trial. Creeping bentgrasses were overall the best performing entries, although colonial bentgrass entries DLFPS- AT/3026 and Musket performed well in particular locations. Barracuda, a creeping bentgrass, was the most consistent turf quality performer over the trial length and across locations with top statistical performance in each LPI group, and each of the five years. In addition, creeping bent entries Piranha, Chinook, 007, V-8, and Crystal Blue Links finished in the top statistical grouping in most LPI groups and most years. Both the Logan, UT, and Riverside, CA, locations
managed as ancillary sites utilized reduced irrigation. At Logan, the five-year data summary showed very good entry separation with Armor, Kingdom, and Nightlife in the top statistical turfgrass quality group. At Riverside, less statistical separation was noted with 007, Penncross, PST- 0RBS, and Shark tied at the top for overall quality at 6.2. Traffic tolerance, evaluated at three sites, yielded
important data over the trial period. Te most statistically significant data from our traffic sites was collected at Amherst, MA, with Piranha, DLFPS-AT/3026, Nightlife, and Kingdom. Te Blacksburg, VA, traffic site evaluated turf quality based on divot damage and recovery in 2017, with Greentime, Crystal Blue Links, DLFPS- AT/3026, Penncross, Musket, and V-8 posting the best quality ratings.
TPI Turf News July/August 2021
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