I grow hops in planters. I have some second years, and some first years.
Problem is, one of my second year cascades started "losing" its bines. They just started to separate from the underground crown and then the leaves would wither and die. The strange part is that this was only happening to one of my Cascades... the others are still growing like wild. When the last bine finally separated and died I decided to have a look.
Well, what I found was a ****load of grubs. They were as thick as my pinky, and a little over half as long.
I looked on the google, and found that they're probably stag beetle larvae or something similar. I found about 15-20 of them and chucked them out of my yard in rage...
BUT, did these things actually kill the hops? Do beetle larvae eat roots underground? If so, how can I treat my potting soil so they won't grow next year? I'd REALLY hate to lose a 3rd year plant next year cause of these things.