The book is the result of many years of mycological and phytopathological studies of woody plants in natural populations, arboretums and urban plantings of Siberia (Novosibirsk, Krasnoyarsk, Kemerovo, Barnaul, Tomsk). Data on 111 pathogenic micromycetes that are causative agents of leaf diseases are given. Modern information on the systematics, distribution of pathogens, their biological features, morphology and harmfulness for plants of the Siberian region is presented. Diagnosis of diseases is given and measures to combat pathogens are indicated. The atlas is illustrated by numerous author photographs that provide a visual representation of the pathogens and symptoms of diseases. The book is intended for botanists, mycologists, phytopathologists, specialists in plant protection, forestry, landscape gardening and landscaping, teachers and students of biological universities and technical schools.