This article provides information about the necrotic-cancerous diseases of plants, widespread in plantations of Surgut. Until now, this group of infectious diseases in the Khanty-Mansiysk Autonomous Okrug is poorly studied, there is no information on the causes of diseases and their harmfulness, measures to combat. Phytopathological analysis of green spaces Surgut has shown a high degree of distribution (from 5,2 to 93,2 %) and the intensity of the damage (9,5 to 72,8 %) plant necrotic-cancerous diseases. Pathogens are phytopathogenic fungi divisions of Deuteromycota (66,7 % of the total number of detected species of fungi), Ascomycota (26,7 %) and Basidiomycota (6,7 %). Under the conditions of the north are dangerous fungi Thyrostoma compactum, caused by an infectious withering (tirostomoz), of elm (Ulmus pumila) and Tubercularia vulgaris, causing necrosis of many plant species (Pinus sylvestris, Betula rubescens, Betula pendula, Padus avium, Crataegus sanguinea, Ulmus laevis and Ulmus pumila ). Diseases reduce the decorative properties of plants, their growth and development. It was established that of the first power of plants tirostomoz lesion reduction of growth is more than 30 %, the second and third degrees - growth is completely absent. To reduce the infection load and improving the phytosanitary condition of the plants in urban plantings must be timely to conduct forestry activities against necrotic-cancerous diseases, with the introduction of ornamental shrubs and formation of artificial planting of plants to take into account the degree of resistance to infectious diseases.
nekrozno-rakovye bolezni, vozbuditeli bolezni, fitopatogennye griby, stepen' rasprostraneniya bolezni, vredonosnost', mery bor'by
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