A couple of weeks ago, I noticed that my raspberries had some wilty leaves at the top of a bunch of non-fruited canes. I admit I was a bit lazy and it wasn't until last week I researched a bit and found the culprit! Raspberry Cane Borers. I've been cutting off the canes well below the bottom mark in hopes that none of them hatched and bore all the way to the base. I look at the cane cross section after cutting, and I don't think any got too far. I hope just cutting off the cane tops when I see them wilt is enough, there is no other prevention listed.
I should have fresh raspberries this week though, a few are already red!