Colias tyche

Hostplant: Astragalus alpinus. The larva also accepted Astragalus glycyphyllos in captivity. I started out using A.alpinus and changed over to A.glycyphyllos when i didn't have more A.alpinus left. The larva did not have any problems with it. A couple of sources online mentions Vaccinium uliginosum as a hostplant. The adult female did not want to lay any eggs on it, and the larva did not start feeding when i tried it.

Lifecycle and behavior: The female easily laid eggs on fresh A.alpinus. As with Colias hecla, the eggs changed color from yellow to red during development. The eggs used 5-6 days to hatch. The larva seems to prefer eating the leaves of the hostplant through its development, but does also eat the flowers and seedpods. The larval stages lasts 3,5-4 weeks, and it molts 4 times. Pupal stage lasts a week. In the wild the larva hibernates at least once, and it can also hibernate a second time as pupa. In my breeding one larva went all the way to adult the same year. The rest of the larva hibernated as full grown L5.

The butterfly is an arctic species confined to the 3 northern most states in Norway. Depending on the weather its usually on the wing from June to July.

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