I released some of the egg-caterpillars in an outdoor cage with potted Lonicera and Ligustrum. Checked the cage last week and there were some full grown caterpillars in it, all feeding on Lonicera and not Ligustrum. Took some of them apart and they refuse Ligustrum and just accept Lonicera as food plant. Those kept indoors from the beginning were reared with Ligustrum. Photo shows a full grown caterpillar.
All the best,