Tanglefoot. http://www.planetnatural.com/product/tree-tanglefoot-insect-barrier/
It’s basically for trees, but can also be used on stiff paper, either was a collar, or flat with a slit for the stem.
Not sure, but diatomaceous earth is used for regular cutworms, so would probably work on yours, too.
Might also try (relatively pricey) beneficial nematodes for a more permanent solution, though it won’t help with the current infestation.
Thanks for the suggestions. I’ll pass them on to Hubby. Now that they got his blueberries, he’ll be serious about trying to get them.