We hand pick them and toss them into a plastic cup with a little water on the bottom. This year it only takes a few minutes to collect a hundred or so. They seem to congregate on grape,rasberry, and blackberry bushes, all of which we have a lot of.
I thought about cutting the bottom out of one of the bag traps and positioning it over the pond but after reading all the warnings on the bait container I decided against it.
