We had a lawn care company come out because of grubs killing the lawn. They applied Merit to the lawn, but they are still lifting up our grass and killing the lawn in other brown patches. Do we need something stronger?
There are indeed some other approaches to treatment. https://www.gardeningknowhow.com/plant-problems/pests/insects/get-rid-of-grub-worms.htm
It may take a couple of years of steady treatment with different methods to get rid of the grubs; on the other hand, like many insects, they may be cyclical, and mysteriously gone by next year. In the mean time welcome the crows - they are seriously helping you, and for free!