Hi Janie,
Thank you for your question regarding leaf curling on your Italian Prune tree. I cannot get clear image resolution to definitively determine the insect from your photos. That said, it may be leafroller. When you unroll the leaf, you will see a small caterpillar, usually green or brown. You may also see chewing on the leaf. Often, you’ll find brown or greenish frass (this is insect excrement) inside the leaf.

The following publications provide images and information about leafroller for your review and comparison:
pnfruittreeleafroller.pdf (ucanr.edu)
Plum and prune-Leafroller | Pacific Northwest Pest Management Handbooks (pnwhandbooks.org)

If this does not look like what is happening with your tree, or you need more information, I recommend you contact the Plant Clinic at the OSU Deschutes County Extension in Redmond. You can call the phone number listed below or send your photos and question to <personal data hidden>

The person on duty will review your information, conduct necessary research, and contact you with findings and management options.

Summer Hours: Monday through Thursday, 9:00 to 5:00 pm, Friday 9:00 am to 1:00 pm.

Phone:<personal data hidden> x79630

We always welcome your home garden questions at the OSU Plant Clinic.