The article provides information on some species of Cronartium genus gall rusts. Their symptoms, biological features, distribution and economic importance are considered. Particular attention is paid to taxonomy and diagnosis of North American gall rusts.

The article presents the results of the study of the phytopathological condition of natural plantations in the north of the European part of Russia – separate districts of the Republic of Karelia and Bolshoy Solovetsky Island (Arkhangelsk Oblast). Descriptions of non-quarantine fungi species isolated from ordinary blueberry plants are given. Data on species identification of micromycetes by morphological characteristics and nucleotide sequence decoding are specified

The article overviews information on the species of the genus Colletotrichum that affect strawberry plants, including the Colletotrichum acutatum and the Colletotrichum gloeosporioides species complexes. It also specifies difficulties associated with the direct identification of pathogens and describes features of mycological research diagnosis and application of the complex approach using conventional and modern molecular genetic methods for precise in vitro analysis.

The article provides current information on distribution, new data on host plants and diagnostic issues of the red spider mite (Tetranychus evansi) – a quarantine object of the Unified List of the EAEU. Original illustrations of host plant damage symptoms and diagnostic characters of the pest are given in the article.

The paper presents a review of literature data on geographical populations of silverleaf whitefly Bemisia tabaci Genn. based on the results of molecular diagnostics. The study of morphological variability of silverleaf whitefly biotypes was conducted. This work can be used by specialists of laboratories carrying out research in the field of plant quarantine, as reference information, and can also be used to monitor populations of silverleaf whitefly.

The article describes the herbological expedition to Krasnoyarsk Krai and the Republic of Khakassia, which took place part of the research project in August 2019, and its results. Researchers studied distribution of weed, invasive (including quarantine) plant species in the field, collected seed and herbarium materials, described the geobotany of agrocenoses, and observed plants in nature.