Zakharova E.Yu., Shkurikhin A.O., Oslina T.S., Solonkin I.A. 2019. [The influence of environmental factors on the caterpillars early instars ratio of Aporia crataegi L. (Lepidoptera: Pieridae) during wintering in the Middle Urals] // Euroasian Entomological Journal. Vol.18. No.4: 292–300 [in Russian, with English summary].
Institute of Plant and Animal Ecology, Ural Branch, Russian Academy of Sciences, Vos’mogo Marta Str. 202, Yekaterinburg 620144 Russia. E-mail: email@example.com
ABSTRACT. In this paper we estimated the larval instars ratio before and after wintering in natural population of black-veined white Aporia crataegi (Linnaeus, 1758) (Lepidoptera: Pieridae) in the Middle Urals (Sysertskii Raion of Sverdlovskaya Oblast). Our objective was to analyze the larval instars ratio depending on a number of environmental factors, namely: 1) the species of host plant, 2) the lighting conditions of the sites, 3) the growing season weather conditions. Phenological observations of adult emergence and monitoring A. crataegi instars ratio after wintering were carried out since 2013. We have collected the A. crataegi winter nests from wild cherry and rowan in August–September 2014, 2017 and 2018 on the same areas, and determined the larval instar ratio before wintering. The weather conditions of the warm season, the host plant species type or biotopic specificity do not affect the diapause of larvae instar of A. crataegi in the Sverdlovskaya Oblast. These factors influence the development rate causing a phenological shift in diapause entering.
KEY WORDS: phenology, larval instars, wintering, black-veined white, Aporia crataegi, Middle Urals.