On the migration of Tortrix viridana L. (Lepidoptera, Tortricidae): Analitical investigation

The author analyses monofactorial theories of population dynamics of Tortri x viridana and discusses the hypothesis of its distant and attended migrati ons together with its specialized parasitoid Dirophanes invisor. Data on T. viridana temporal-spatial distribution for the period of 1938-1995 are pre sented. It was shown that the main factors caused the decrease in populatio n numbers are intrapopulation mechanisms, providing the initiation long emb ryonic diapause for some part of population, the decrease in the frequency of its outbreaks. Some data indicate that large scale migrations are not im portant for spreading of T. viridana outbreaks.