Pasmo disease of flax. Biological method of identification of Septoria linicola

Pasmo is a dangerous disease for cultivated and wild flax species, its pathogen, Mycosphaerella linicola Naumov (Septoria linicola (Speg.) Garass.), has a quarantine status for some countries importing flax products from Russia. For flax seed products exported from Russia to meet modern phytosanitary requirements, they must be free from dangerous plant pathogens, including Mycosphaerella linicola, which, despite its wide distribution, is included in the quarantine lists of countries such as Egypt, Uzbekistan, the Republic of Korea, China and Belarus. Therefore, understanding the biological processes of the vital activity of the pasmo flax disease pathogen and the related issues of detection and identification are of particular importance. Modern diagnostics of phytopathogens includes a set of measures based on a combination of molecular genetic and classical methods. The article considers issues related to the biological method of pathogen identification, based on knowledge of the biological characteristics of the disease development and cultural and morphological analysis. In the studies conducted by the authors in 2021 on the basis of FGBU “VNIIKR”, important aspects of the life cycle of Septoria linicola are identified and clearly illustrated on agar nutrient media, allowing identification of the causative agent of flax pasmo disease in the laboratory in a short time. The article also discusses the history of the spread of the disease and changes in the taxonomic status of the pathogen.

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