With the arrival of summer also comes the arrival of a couple very destructive pests: June bugs and Japanese beetles. While very similar and often confused, June bugs are brownish, nocturnal insects, while Japanese beetles are a shiny green and active during the day. In their larval stage as grubs, these pests feast on turf roots. As adult beetles, they focus on the foliage and fruit of over 400 plant species. After emerging from lawns in late June and July, Japanese beetles start to chow down. They have a tendency to cluster in big groups on some plants more than others, and they can completely skeletonize a plant in no time.