Abstract
Aim of study: The paper presents the results of studying the content of extractive substances in Picea obovate L. wood in places of mass development of Ips typographus in the European part of Russia (the Udmurt Republic). 
 Area of study: The Udmurt Republic is located in the East of the Eastern European plain (in the Urals) and has the total area of 42.1 thousand km2. Udmurtia is located in the basins of such large rivers as the Kama and Vyatka.
 Material and methods: To assess forest stands, two test plots were allotted in two forest districts in the South of the Republic. Stand parameters of the plantings were determined according to generally accepted methods. After taking into account all the trees on the site, the plants of the main tier were divided into three groups according to their vital condition. Within each group, three individuals were selected to study the biochemical characteristics of wood. 
 Main results: The results of the study showed that one of the factors determining the content of extractive substances is the state of the plant.
 Highlights: It is obvious that the studied substances play an important protective role in the adaptive reactions of Siberian spruce in response to bark beetles.
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