Golfdom, November 2018

Super Science Continued from page 27 Additionally there was no visible injury from any treatment after spring green up This short lived and minor injury on zoysiagrass is consistent with previous reports and consistent with findings that zoysiagrass is among the turfgrass species least injured by ethephon Turf quality largely was unaffected by the treatments although quality was improved after green up in some plots because of reduced seedheads and subsequently improved mowing quality Figure 6 THEORY OF SEEDHEAD SUPPRESSION Some grasses especially those adapted to high altitudes or latitudes are capable of initiating inflorescence development in the fall with inflorescences emerging after winter Meyer zoysiagrass is adapted to cold winters and was selected from high latitude while many other zoysiagrass cultivars used in the Southeast are less winter hardy and were collected from lower latitudes We theorize that Meyer zoysiagrasses flowering induction requirements are met by decreasing daylength and temperature in autumn and winter vernalization whi le secondary induction requirements of increasing daylength and temperature are met in spring Other zoysiagrass cultivars such as Diamond Zoysia matrella L Merr that have both spring and fall seedhead TABLE 1 28 Golfdom November 2018 Golfdom com PHOTO BY ZAC REICHER FIGURE 4 Closeup of Meyer zoysiagrass after mowing showing shredded whitish seed stalks Site and application information for experiment locations Locations Site information West Lafayette Ind Manhattan Kan Lexington Ky Proxy application date A 23 Sep 2016 27 Sep 2016 29 Sep 2016 Proxy application date B 14 Oct 2016 25 Oct 2016 31 Oct 2016 Proxy application date C 18 Apr 2017 11 Apr 2017 31 Mar 2017 Proxy application date D 12 May 2017 9 May 2017 28 Apr 2017 Total daylight hours date A 121 119 119 Total daylight hours date B 112 108 106 Total daylight hours date C 134 131 126 Total daylight hours date D 144 142 137 Accumulated cooling degree days CDD on date A 7 13 8 Accumulated cooling degree days CDD on date B 92 133 115 Accumulated growing degree days GDD on date C 109 98 115 Accumulated growing degree days GDD on date D 190 223 295 from https www timeanddate com