Jon from Point Roberts, Washington writes
Sevin Concentrate will kill many types of adult beetles, but it will not treat the larvae or grubs. We would recommend using a systemic product earlier in the season before egg hatch for the best results, such as Merit Insecticide Granules. If you currently are seeing grub/larvae damage, then Dylox is the curative treatment that works right away on these pests.
Answer last updated on: 08/14/2017