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Article establishes that the modern system of diagnostics of the state of tree on the basis of account of the only confessed (legalized) list of external pathological signs does not give the objective estimation of the state and perspective of stand. Authors, on the example of stands of English oak, in plantings of Voronezh, Belgorod and Tula regions, show variety, differentiation, specificity and meaningfulness of external pathological signs. The features of display of pathology of English oak are marked in the different plantations. A list of detected and the proportion of pathological signs in the oak forests is given. It is found that from found out pathological signs on the oak trees the first ones are open inboard hollow more than 50%. Second place was taken by trees which have dies skeletal branches up to 40%.The third position is occupied by signs, reflecting pathology that is not confessed to be such even in educational literature on forest protection. It is pathology of trunk formup to 15.5 %. At the fourth place on the prevalence of pathological signs is strong weakening of the stand, there are trees with not dead, but fallen away and open large twigs – up to 14.5%. Least encountered oak pathological signs are flying insect stem holes, hollows in the trunk and burls growths. It is noted that virtually occurrence of the above pathological symptoms varies within a wide range, and a set of existing pathological signs used to assess the state of oak trees requires verification, additions and differentiation. More research is needed to substantiate and implement the relevant regulations of such pathological features as a hollow butt, shrunken skeletal branches, twigs, and not overgrown thunderstorm cracks. When fixing the pathological features we need their quality-tion and quantity characteristic, assessment of the state of the tree and the entire stand depends on it.

Specifics of diagnosis of oak wood condition based on visual assessment of external signs of pathology