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The condition was evaluated of tissues of declining young spruce stands in selected localities of the Orlicke hory Mts. It refers to stands occurring in top parts affected by an air pollution disaster in the last century. Several types of damage of a different symptomatic character were distinguished. A high NO x input appears to be the risk factor of spruce dieback in the Orlicke hory Mts. One of the main causes in the complex of factors is the unbalanced cause of meteorological factors during the year and unbalance in mineral nutrition. The result is decrease in lignification, imma - turity of tissues before the winter period and increased susceptibility of damaged tissues to parasites. Several potentially pathogenic species of micromycetes have been identified which can be considered to be significant pathogenic agents in case of declining spruce in the Orlicke hory Mts., however, not a main cause.

About phytopathological and histological aspects of Norway spruce dieback in the Orlické hory Mts.