A hundred years ago, we would have laughed at the idea of a lawn service. To maintain these barren monocultures, huge quantities of pesticides are applied.
Little research exists on use of multiple pesticides.
We do not know the interaction or compounded effects on human or wildlife health. Federal licensing is no guarantee of safety. Tests do not include toxic effects on many biological systems of the unborn, infants, or children. The alternatives range from changing how you care for your lawn to replacing your lawn with diverse habitat. Think about it.