Visual signs of the negative influence of various factors in woody plants include the loss of decorativeness and vitality, discolouration of needles, uneven growth, etc. Conifers of the boreal zone, including Siberian fir (Abies sibirica Ledeb.), have the most pronounced decrease in the ability of plants of green plantations to resist extreme environmental conditions. In perennial plantations of Siberian fir, scientists identified a complex of fungi distinguished not only by low biodiversity but also by the abundance of phytopathogens and moulds from the genera Alternaria, Diplodia, Macrophoma, Pestalotia, Sclerophoma, Cucurbitaria. The article shows that under stressed conditions (imbalance in nutrients, etc.), the fir plants in the root zone have critical disturbances or mycological effects which characterizes the deterioration of their viability and loss of resistance to disease. This data are useful for phytosanitary monitoring of green plantations and planning environmental protection measures in urban areas.
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