|This is what a Beetle Party looks like|
In five minutes I can clean the vine of 4 or 5 dozen beetles. A few will startle and decamp but if I wait 5 or 10 minutes they'll be back. There's not much fun stuff to do away from the party vine.
I put Castile soap in the water which kills them almost immediately.
I leave them for a bit then I pour it out on the pavers of the compost area and crush them with a shovel to make sure they're very dead. Beetles are controllable but like most pests, you have to do it every day every year to keep them in check. You are never really rid of them.