Some graminicolours species of Helminthosporium in Finland

Abstract

Abstract. -This paper is pam of a larger study of the fungi causing leaf-spot diseases which affeot llhe grasses on leys in Finland. The material examined consisted of grasses growing on cultivated gra:sSiland or the borders of fields. The fresh materiad (c. 3770 samples) was collected at Viilk and the Muddusniemi Experiment Farm of Helsinki UnivePsity, art: Experiment Stations of the Agricultural Research Centre, the Plant Breeding InstitutJe of Ha:ruklkija and in other Localities in sounthem Finland. In additio. n seeds of grasses (c. 160 lots) ohiefly from llhe State Seed Testing Station (SSTS) and from the material (c. 40 lots) of the late Prof. Otto Valle's experiments were investigated. The last mentioned lots of the Finnish seeds (Tammisto) were produced in the USA. This study is moreover has• ed on artificiaJ cul1 ture and inoculation tests.

The emergence of cereal fungal diseases and the incidence of leaf spot diseases in Finland

“…There is evidence that one reason for rapid increase of P. tritici-repentis is the practice of wheat monoculture combined with no-tillage cultivation (Huusela-Veistola et al 2008). Moreover, P. tritici-repentis has been recorded in 50% of the studied Finnish Agropyron (Elymus) repens samples (Mäkelä 1971), a weed present in 30% of the spring cereal fields in Finland (Salonen et al 2011). P. tritici-repentis is a fungus that became pathogenic on wheat only recently in comparison with other leaf spot diseases.…”