Station of Struggle with Forest Pests and Diseases, Moskovskoe shosse 12, Ryazan 390044, Russia

Abstract

The author analyses monofactorial theories of population dynamics of Tortrix viridana and discusses the hypothesis of its distant and attended migrations together with its specialized parasitoid Dirophanes invisor. Data on T.viridana temporal-spartial distribution for the period of 1938-1995 are presented. It was shown that the main factors caused the decrease in population numbers are intrapopulation mechanisms, providing the initiation long embryonic diapause for some part of population, the decrease in the frequency of its outbreaks. Some data indicate that large scale migrations are not important for spreading of T.viridana outbreaks.