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Willow Apple Gall Sawflies. Can they be raised from collected leaves with galls on them?

Every year I see Willow Apple galls in Santa Cruz, California, and sometimes I see the galls photographed and the photos identified as "Pontania californica, Willow Apple Gall Sawfly"

But I don't think I ever see the sawflies themselves. Recently I have seen photos of the galls opened up revealing tiny live caterpillar-like larvae inside. My impression is that there is one larva for each bright red gall on a leaf. Note one leaf may have many bright read "Willow Apple Galls". The start out small, and grow as hard red blisters on the outside of the leaves. When the get close to full sized the galls protrude from each side of the leaf. It is at this point when people seem to dissect the galls revealing a tiny caterpillar-like larva inside. What I want to know is would it be possible to raise one of these caterpillars to adult hood, or does that happen inside the living gall?

Do these insects emerge the galls as larvae or as adult sawflies? If they do emerge as larvae, I would be hopeful that they could be raised. If not, maybe it would still be possible by feeding them fresh gall pulp?

I know it is not a question from a well informed person, just a person who wants to finally see a Willow Apple Gall Sawfly adult!

Thanks for any information,