Anvil® 10+10 (sumithrin)
"The product name of the mosquito adulticide used by the Project in ULV (Ultra Low Volume) sprayers is called Anvil®. It is a combination of two ingredients, sumithrin (10%) and piperonyl butoxide (10%). Sumithrin is a synthetic pyrethroid, and piperonyl butoxide is a synergist (a chemical that enhances the ability of another), allowing sumithrin to control the adult mosquitoes at a lower concentration. It is sprayed from the truck at 1.9 ounces per minute, at a vehicle speed of 5-15 miles per hour. This presents a minimal risk to humans, pets and non-target species. The active ingredient in Anvil photo-degrades (breaks down in sunlight) in less than four hours."
I looked up Sumithrin (it being a pyrethroid, I can't believe it will dissipate in 4 hours). http://www.pesticide.org/get-the-facts/ ... /sumithrin
If the prairie hasn't been sprayed, I'd go there and get leaves. Take a baggie and collect several leaves. Wash them and put them into a ziplock bag with a papertowel wrapped around them. These are good for several days. Just take out what you need to feed and dry them.