Effects of rolling and N-fertilization on dollar spot and Microdochium patch on golf greens in Scandinavia

Tatsiana Espevig,Karin Norman,Marina Usoltseva,Y Tokarev,V Glupov

doi:10.1051/bioconf/20201800008

Tatsiana Espevig, Karin Norman + Show 3 more

Open Access

https://doi.org/10.1051/bioconf/20201800008

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Abstract

Dollar spot was officially documented in Scandinavia in 2013 and the spread and damage from this disease has increased during last years. In summer 2017, on the golf greens with red fescue (Vallda GC, Sweden) and with the mixture of red fescue, colonial bentgrass and annual bluegrass (Roskilde GC, Denmark) rolling 2 times per week reduced dollar spot 61% and 37% and rolling 4 times per week reduced dollar spot 95% and 54%, respectively. Thus, rolling 3-4 times per week can be recommended on golf greens with dollar spot pressure. In the experiment 2018 dollar spot was reduced 24% with increase in nitrogen from 150 to 240 kg ha-1 yr-1 on creeping bentgrass/annual bluegrass golf green (Kävlinge GK, Sweden). However, the increased N-rate lead to a higher degree Microdochium patch from 14% to 30%.

Highlights

Dollar spot caused by Clarireedia spp. was officially documented in Norway in 2013 [1] and in Sweden in 2014 [2], and the disease found on more than 20 Nordic golf courses
The golf greens consisted of pure red fescue (Festuca rubra L. ssp. commutata 40% and spp. litoralis 60%) in Vallda GC and of 33% red fescue (Festuca rubra L. ssp. commutata 16% and spp. litoralis 17%), 34% colonial bentgrass (Agrostis cappillaris L.), 27% ryegrass (Lolium perenne L.) and 6% annual bluegrass (Poa annua L.) in Roskilde GC
On average for August-September 2017, rolling 2 and 4 times per week starting in June, reduced dollar spot 61% and 95%, respectively, on a red fescue green in Vallda GC as compared with no rolling (79 individual infection centres per 1 m2 on the plots with no rolling) (Table 1 and Figure 1)

Summary

Introduction

Dollar spot caused by Clarireedia spp. was officially documented in Norway in 2013 [1] and in Sweden in 2014 [2], and the disease found on more than 20 Nordic golf courses. No research has been conducted in the Nordic environments on any control measures. From the previous studies in USA where dollar spot has been studied for at least 50 years, it is known that this disease is favoured by the combination of dry soil and a moist turf canopy [3]. From the previous studies in USA it is known that dollar spot is favoured by such cultural practices as low fertilization, especially nitrogen [7,8].

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