Celastrina argiolus

Hostplant: The larva feeds on different kinds of plants and bushes, especially Frangula alnus and Vaccinium myrtillus. I used V.myrtillus in my breeding.

Lifecycle and behaviour: In captivity the female laid her eggs in clusters almost exclusively on the flowers and flowerbuds of the hostplant. In the wild i think its more normal for the female to lay her eggs singular. The eggs used 5 days to hatch. The young larva exibited a rather tedious eating behaviour where they would dig in and eat some parts of a proximal stem, causing the distal parts of the plant to die. As such i had to change hostplant very frequently! As they grew bigger they started targeting the developing berries, often leaving only a hole and an empty interior of the berry. They rarely fed on the leaves. The whole larval stage lasted 14-16 days, and they molted 3 times. Pupal stages lasted about 8-9 days. These timings are based on indoor captive breeding and may differ from natural outdoor conditions. The adult butterfly is on the wing usually from April until August. It flies in 1-2 generations, depending on the weather conditons. In my personal experience i found the 2nd generation to have become much more common in recent years. The pupa hibernates in the autumn.

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