Hi there.
These are very easy to pair and rear - but I do not think you will find any foodplants available now that the larvae will accept. Really the pupae should be kept cold until Spring when the natural foodplants - Poplar, aspen and willow - will be in leaf.
You could try bringing some sprigs of any of the above inside to encourage them to leaf out earlier. But in the long run the caterpillars may not thrive as the foodplant may intake too much water.
Hi,
Why not want to breed them in the summer when you have enough natural food available?
Your attempts to breed these species at the "most unnatural" times, when there is no suitable food, are incomprehensible.
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