Phenology of the 28-spotted potato ladybird beetle <i>Henosepilachna vigintioctomaculata</i> in the south of the Russian Far East

Relevance . The 28-spotted potato ladybird beetle, Henosepilachna vigintioctomaculata, causes severe damage to plants of the Solanaceae family in south Russian Far East. Today application chemicals is main method for protecting crops against beetle. This leads not only eradication pest, but also pollution agricultural ecosystems and emergence beetle populations that are resistant pesticides. A study on seasonal cycles development may help devise new methods controlling this pest. Methods We conducted laboratory experiments developmental timing ofa beetlepopulation. number eggs was counted, then were placed Petri dishes. emerged larvae recorded a daily basis. hatched transferred glass containers (hereafter rearing cages) batches 10. dates transition from one immature stage another notingthe simultaneity these transitions. At onset pupal stage, date food withdrawn cages. Scientific observations carried out ofyoung beetles. Field research phenology at afield site 40 m 2 following events recorded: adult beetles diapause, colonization field, beginning end oviposition, pupae, flight insect generation. Results conclusion Our experiment stages revealed egg 4-5 days duration, larval 16-17 daysunder optimal conditions. observed deviations mean values, which could be conditioned by external factors. For instance, duration embryonic depended either humidity or time range hatching mass. pupae most probably due quantity quality available food, presence secondary metabolites glycoalkaloids it. field thephenology showed there generation 2020, two generations 2021. After comparing climatic conditions 2020 2021, we concluded vigintioctomaculata can produce during dry hot years.