what is the chemical my mosquito servicce uses to repel misquitoes and ticks? The use a Sthil SR-420 backpack sprayer, and claim the chemical is some form of synthetic chrysanthemum and totally safe

We carry Dr.Ts Natural Mosquito Repellent, but nothing of chrysanthemum. You may also use items such as Suspend SC to spray onto outside surfaces. Suspend SC will have a delay kill effect on mosquitoes as well as other common household pests.