Re: 20 hives - what sort of gear do you use?
Acebird - have you seen a slime-out? It is a horrible experience. Luckily I had none so far this year.
It is getting cooler here and the numbers are now down. I have learned to manage them fairly successfully. I simply change the traps about every 3 weeks. Extra work but it does seem to keep numbers pretty low - mostly!
I'm trying out the Mann Lake " Beetle Blaster" traps ( on special this week) and I like them so far - nice an deep. I use no oil - only DE.