Rhynchosporium species on Finnish grasses

Authors: Mäkelä, Kaiho
Journal: Karstenia, Volume 13 (1973), pages 23-31.
Doi: https://doi.org/10.29203/ka.1973.79
Full text: PDF

Abstract:  “The material (c. 2800 samples) for this study was collected from planted grassland or the borders of fields throughout the conutry in 1966- 1970. Rhynchosporium orthosporum Caldwell was observed to occur commonly on cultivated and wild grasses in many localities from Helsinki to Lapland. Spores of the fungus were most abundant in the leaves of the grass in early spring and were least abundant in mid summer.
R. orthosporum was the most common causer of leaf spot diseases on Dactylis glomerata L., during the growing season and in part also under the snow. It was also common on Alopecurus pratensis L., especially towards the beginning of the growing season. R. orthosporum also occurred commonly on Phleum pratense L., Festuca pratensis Huds., Lolium perenne L ., Poa pratensis L. and Festuca rubra L. On these grasses the significance of R. orthosporum was smaller than on the grasses first mentioned.
In addition native spores of R. orthosporum were found sporadically on the following species of grass: Agrostis stolonifera L., A. tenuis Sibth., Alopecurus geniculatus L., Calamagrostis arundinaceae (L.) Roth., C. epigeios (L.) Roth., Deschampsia caespitosa (L.) PB., Lolium multiflorum Lam. and Poa annua L. Rhynchosporium secalis (Oud.) Davis was observed rather commonly on Agropyron repens (L.) PB. and sporadically on Bromus inermis Leyss.”