Published: 2018-08-141

Health Conditions of the Olsztyn Forests

Jerzy Adomas
Humanities and Natural Sciences
Section: Articles
https://doi.org/10.31648/hip.363

Abstract

A forest as a complex of nature of the defined properties performs a se­ries of economic and non — economic functions (wood production, side forest produce, preservation of biological equilibrium in the environment, ef­fects of tree stands on a local climate, soil and water relations, landscape shaping). As a natural complex, it is not very stable and it is influenced by numerous biotic, abiotic and anthropo­genic factors.

It appears, from the practice of the forest protection within the admi­nistrative borders of the Regional Ad­ministration of State Forests in Olsztyn, that insects — from the group of primary pests — that feed on living or seemingly healthy trees weakened by the action of one or several factors, usually abiotic ones. The appearences of some of them force to undertake the control measures.

This paper deals with the of kee­ping the numbers of three butterflies, i.e. Lymantria monacha L., Panolis flammea Schiff., and Tortrix viridana L., under the level called for many ye­ars as „an iron ration".

Keywords:

functions of forests, forest health conditions, forest protection, control measures

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Adomas, J. (2018). Health Conditions of the Olsztyn Forests. Humanities and Natural Sciences, (1), 145–152. https://doi.org/10.31648/hip.363

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