The results of the analysis of the sum of effective temperatures (SET) necessary for the development of gypsy moth to the adult stage in different latitudinal parts of the area (Northern, Central, Southern) are presented. It was shown that the SET necessary for the development to the adult stage in the Northern part of the area is much lower (1.5-2 times) than in the Central and Southern parts. One of the reasons for such differences was a significant decrease in the duration of development of caterpillars with a decrease in SET received by embryos from the populations of the Northern part of the area before falling into diapause.

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