I've found the almost perfect method to catch those pesky Japanese beetles. I cut an ammonia bottle into a scoop form, leaving it as tall as possible. Then I used a rubber band to attach a plastic bag to the "screw top" end. I use my trowel to "tap" the beetles into the funnel, they slide down into the bag before they even know what hit them. This works much better than my previous method of tapping them into a 1 qt. yogurt carton with a couple of inches of water in the bottom.