EN
The wholesome state of our forests is bad, and, here and there, even catastrophic. Particularly dangerous are insect pests showing a tendency to mass occurrences in the form of gradations deadly threatening hundreds and even thousands of hectares of tree stands. This paper presents an evaluation of control measures undertaken in 1979-1988 n the Kurpiowska Primaeval Forest. The possibilities of limiting chemical measures to the very necessary minimum are also presented.