In vitro screening of turfgrass species and cultivars for resistance to dollar spot. Issue 1 (4th August 2021)

• Record Type: Journal Article
• Authors: Espevig, Tatsiana; Sundsdal, Kristine; Aamlid, Trygve S.; Crouch, Jo Anne; Normann, Karin; Usoltseva, Marina; Entwistle, Kate; Torp, Torfinn; Brurberg, May Bente
• Is Part Of: International Turfgrass Society Research Journal. Volume 14:Issue 1(2020)
• Page Start: 873
• Page End: 882
• Publication Date: 2021-08-04
• Subjects: 635.9
• DOI: 10.1002/its2.78
• Languages: English
• ISSNs: 1817-0641

Abstract

Abstract: Dollar spot, caused by at least five Clarireedia species (formerly Sclerotinia homoeocarpa F. T. Benn.), is one of the economically most important turfgrass diseases worldwide. The disease was detected for the first time in Scandinavia in 2013. There is no available information from Scandinavian variety trials on resistance to dollar spot in turfgrass species and cultivars (http://www.scanturf.org/ ). Our in vitro screening (in glass vials) of nine turfgrass species comprising a total of 20 cultivars showed that on average for ten Clarireedia isolates of different origin, the ranking for dollar spot resistance in turfgrass species commonly found on Scandinavian golf courses was as follows: perennial ryegrass = slender creeping red fescue > strong creeping red fescue > Kentucky bluegrass = velvet bentgrass > colonial bentgrass = Chewings fescue ≥ creeping bentgrass = annual bluegrass. Significant differences in aggressiveness among Clarireedia isolates of different origin were found in all turfgrass species except annual bluegrass (cv. Two Putt). The U.S. C. jacksonii isolate MB‐01 and Canadian isolate SH44 were more aggressive than C. jacksonii isolates from Denmark and Sweden (14.10.DK, 14.15.SE, and 14.16.SE) in velvet bentgrass and creeping bentgrass. The Swedish isolate 14.112.SE was generally more aggressive than 14.12.NO despite the fact that they most likely belong to the same Clarireedia sp. The U.S. C. monteithiana isolate RB‐19 had similar aggressiveness as the Scandinavian C. jacksonii isolates, but was less aggressive than two U.S. C. jacksonii isolates MB‐01 and SH44. Thus, aggressiveness of Clarireedia isolates was more impacted by their geographic origin and less by species of the isolate and/or the host turfgrass species. Core Ideas: Resistance to ten Clarireedia isolates was tested in nine turfgrasses comprising 20 cultivars. Aggressiveness of Clarireedia isolates varied on each turf species except for annual bluegrass. Perennial ryegrass and creeping red fescues were the most resistant species. Cultivars of colonial bentgrass and Chewings fescue varied mostly in dollar spot resistance. Aggressiveness of isolates varied with geographic origin but not with Clarireedia species.