Ticks live in the edges — leaf litter, stone walls, the first three feet of woods — and mosquitoes breed in standing water measured in tablespoons. Treating those beats treating the lawn, and uses a fraction of the product.
Every visit starts by finding and emptying the water sources: gutters, tarps, plant saucers, the corrugated drain nobody has looked at since it was installed. Treatment then goes to the shaded harborage where the adults rest, not across open grass where they do not.