Carbondale, IL. In 2012, roughly two-thirds of the entries were statistically similar, and in 2013, that number had been reduced to about one-half. In 2015, about 40 percent of entries finished in the top statistical performance group for turfgrass quality. Even though the entries are continuing to separate themselves, the differences are fairly small and at this point, it is difficult to note true differences in shade tolerance among these entries. Drought tolerance was also tested in an ancillary trial at Logan, UT. Past data from this trial has yielded some decent separation among the entries, but 2015 turf quality data demonstrated more separation. A06-46, Mazama, J-1770 and A00-2882 ranked highest of the dozen entries in the top statistical grouping. Traffic tolerance was evaluated at five locations in 2015. At the Amherst, MA location, Rubix, Legend, Arrowhead and Keeneland were the only entries to finish in the top statistical group on both wear tolerance rating dates. At Madison, WI, A05-360, Barvette HGT, J-1136 and Nu Chicago topped the turf quality ratings under traffic. However, about 25 other entries were statistically similar in traffic performance. In Knoxville, TN, Barvette HGT, BAR VV 118352
and Bluebank demonstrated the best recovery quality about six weeks after fall traffic was applied. Rubix, Barvette HGT and Arrowhead also performed well at North Brunswick, NJ, showing good canopy fullness ratings after fall traffic applications. And the East Lansing, MI, location data again showed little statistical differences among the entries. Data on various diseases such as summer patch
(Magnaporthe poae), dollar spot (Sclerotinia homeocarpa), and crown rust (Puccinia coronata) were reported in year four of this trial. Summer patch is one of the most devastating, if not the most devastating, disease, on Kentucky bluegrass. In 2015, Blacksburg, VA, Raleigh, NC, Knoxville, TN, and Manhattan, KS, reported summer patch data. Seven ratings were collected by the four locations and again this year, Skye, Barvette HGT and SRX 466 finished with high summer patch ratings. Interestingly, BAR PP 110358, showed excellent summer patch tolerance in the past, and again this year at three locations: Raleigh, NC, Knoxville, TN, and Manhattan, KS. At Blacksburg, VA, however, BAR PP 110358 had one of the lowest summer patch ratings, possibly indicating that a different race of the disease was active at that location. Several diseases were active on the Kentucky bluegrass
trial at Stillwater, OK, in 2015. Crown rust was noted at Stillwater with SRX 466, Oasis, BAR PP 110358, America and A05-360 showing no crown rust disease. Brown patch ratings were variable but Barvette HGT and Burl 3-51 finished with the least disease infection. Leaf spot and dollar spot ratings were also collected at Stillwater, OK, with many entries showing good tolerance
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Differences in disease resistance are apparent in this 2014 NTEP Fine Fescue trial at College Park, MD.
to one or the other disease. Overall, Barvette HGT stands out as an entry that showed very good resistance of all four diseases seen at this location in 2015. As noted above, as these trials age, other factors such
as thatch development play a role in performance. Te Madison, WI site measured thatch development in 2015 with some interesting results. Tatch depth was evaluated twice, with a range of 0-33 millimeters (1.3 inches) occurring in the data. Some of the best entries for the least thatch measured include: J-1770 (0-3 mm), Barvette HGT (0.3-0.7 mm), BAR PP 110358 (0-4 mm), Nu Chicago (0.7-3.3 mm) and Award (1.3-5.0 mm).
Tall Fescue We are now reporting on third year results from our
latest tall fescue trial, planted in 2012. Te trial contains 116 entries, of which most all are still experimental, and will be evaluated for five years. Year one data typically reflects establishment rate, year two data usually reflects broader cultivar performance, while years three through five often allow us to determine if trends seen in year two are still viable. A final summary brings all the years together and is the best measure of long-term performance. As in the past, turfgrass quality ratings varied by
region and even by state location. Te most separation in performance was noted in some of the Transition Zone locations, such as College Park, MD, Columbia, MO, Raleigh, NC, and Stillwater, OK. Technique, 4th Millennium SRP and Traverse SRP, among others performed very well at these locations in 2015, besting the top performers Faith and Catalyst from the previous trial. Data from the Northeast was collected at Storrs, CT, University Park, PA and two New Jersey locations. Entries like CCR2 generally performed well in the Northeast where brown patch (Rhizoctonia solani) was active. Otherwise, a shuffling of entries and their performance occurred in the Northeast, and in other regions. Locations in the South, Southeast and Southwest
generally did not note large entry differences with anywhere from 50-75% of all entries performing
TPI Turf News July/August 2016
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