My garden is under assault this summer by Japanese beetles from above, and moles from below. From my research, Japanese beetles lay their eggs a few inches underground, and moles are voracious insectivores.
I've been hand-picking the beetles every few hours but as they're nearly constantly getting it on this time of year, I'm sure they've already laid plenty of eggs for next year's crop. I notice that the moles' surface feeding tunnels seem to be concentrated more heavily near the infested plants. Is this a coincidence or can I count on them to gobble up the eggs and grubs?
I don't love how the moles push up the lawn, but I can tolerate pushing the turf back down every morning if I knew that they were cleaning up the grubs underneath.