The dependence of leaf beetles generation time on the seasonal cyclicity of phenological processes in the Samara Region

Pavlov S. I., Yaitsky A. S., Miniyarov F. T.

Article studies the phenological dependence of the generation time of 6 leaf beetles species (Coleoptera, Chrysomelidae) from environmental conditions in Samara region: Oulema melanopus (Linnaeus, 1758); Timarcha tenebricosa (Fabricius, 1775); Chrysomela populi Linnaeus, 1758; Phyllotreta vittula (Redtenbacher, 1849); Hispa atra Linnaeus, 1767; Cassida rubiginosa Müller, 1776. Observations of generation dates revealed that Oulema melanopus and Phyllotreta vittula belong to the early spring group, Timarcha tenebricosa, Hispa atra and Cassida rubiginosa to the late spring, while Chrysomela populi is an intermediate group. It was found that excessively low or high air temperature, sharp temperature fluctuations, excessive humidity of the environment and frequent changes in wind speed render a strong inhibitory effect on the development process and timing of the appearance of preimaginal stages of leaf beetles.

Keywords:leaf beetles; Coleoptera; Chrysomelidae; Oulema melanopus (Linnaeus, 1758); Timarcha tenebricosa (Fabricius, 1775); Chrysomela populi Linnaeus, 1758; Phyllotreta vittula (Redtenbacher, 1849); Hispa atra Linnaeus, 1767; Cassida rubiginosa Müller, 1776; phenology; Samara Region.