Page 23 - Transitioning Turfgrass

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6 ETS Field Days

size measured 1 x 2 meters. One half of the plot
was devoted to rolling 4X weekly and the other
half was not rolled. Ratings were taken on select
dates by counting the number of dollar spot infec-
tion centers. Means were subject to an analysis of
variance and were separated using Fisher’s LSD
test (P < 0.05).

Results

* Sapporo Golf Club Yuni Course: rolling re-
duced dollar spot compared to the non-rolled
in all treatments. Minimal differences were
observed among the fertilizer treatments,
however, all fertilizers did reduce dollar spot
more than untreated. This experiment indicat-
ed that rolling and fertilizer application could
reduce dollar spot up 65% more than no roll-
ing or fertilizer application.
* Star Hue Country Club: Rolling reduced dollar
spot in all treatments compared to non-rolled
(Fig. 1, page 18, and 2). Fertilizers that consist-
ed of urea as the main source (Urea and Poly-
on) were the top-rated fertilizer treatments Figure 2 Experimental plot demonstrating no-rolled
(Fig. 1, page 18). Overall, all rolled treatments plot significantly infested with dollar spot at Star
reduced dollar spot by more than 90% when Hue CC, Korea (picture taken on July 15, 2016).
compared to the non-rolled untreated.

cies-specificity was observed in this study, nor was
Discussion there any specificity observed between rolling
machines in our previous studies. Consequently,
These fairway rolling experiments using Tru Turf the potential of reducing fungicide applications
FR-108 rolling head mounted on Jacobson fair- with fairway rolling under nitrogen applications
way mowers showed the potential to reduce dollar could offer an economically and environmental-
spot infection substantially if rolling programs are ly friendly solution for dollar spot management.
used regardless of turfgass species composition at A deeper investigation of the factors influencing
golf courses fairways in Asia. Overall, both loca- mechanisms of fairway rolling on dollar spot re-
tions showed the potential for a 65-90% reduction duction is undergoing.
in dollar spot compared to non-rolled untreated
plots. These disease reductions could substantially
reduce fungicide inputs on fairway turfgrass. In Acknowledgement
addition to reduced dollar spot incidence, other
benefits were also observed including increased Our sincere appreciation goes to superintendents
quality, firmer surfaces and broadleaf reduction, at respective golf courses. We extend our grati-
as well as thatch compression and/or reduction. tude to Tru-Turf’s funding for the study and deliv-
Furthermore, we concluded that no turfgrass spe- ery of a fairway roller to each country.

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