Blueberry leaves gone missing!

I have a few blueberry bushes. They all have fruit developing. But one has leaves that are completely disappearing. The branches are completely stripped. Not a sign of the leaves anywhere. What’s happening? Any ideas? Have checked for caterpillars and can’t see any.

Hard to think of an explanation given that it's only one bush affected - is it possible that the affected plant has received less water than the others and has shed its leaves as a result? (The 'evidence' could have blown away given the breezy weather.)

Vine weevils are a possibility, especially if container grown - might be worth scraping away some of the soil or compost to see if something is attacking the roots.