They must be cyclical. We have very few Japanese beetles this year, and the crape myrtles are blooming well. The past two or maybe three years, the JB ate the buds off mostly before they bloomed, and damaged the garden some too.

When the JB were most numerous, I would catch maybe a couple hundred and throw them into the pond. The BG didn't go for them nearly as well as they go for grasshoppers.