dogd,
There are only two products here in Antimony: beef and recreation. The crops are solely for the ranchers' use for feeding cattle over the winter. Acres and acres of alfalfa is the only thing grown here and only the beef goes to market. Nothing organically produced in this valley, and no interest that I know of, I'm sad to say. There's only 150 people living here, and almost all are fourth-generation ranchers who have "progressed" to the point of loving their insecticides, but no further.
We have an extremely short growing season: about 80 days. The mosquito season is also short but very intense-usually only 4-6 weeks with ideal conditions. Already, though it's mid-August, the mosquitos are dying off because it's down to 40 degrees at night, with freezing temps in another week or two.
The sprayers' area is the stretch of highway between the lake and the river, where most of the mosqs breed. Unfortunately, we live right in between (my husband is the Ranger in charge of the State Park and lake across the street from our house). The sprayers drive through the park, too. People are willing to have a lot of insecticide use because the alternative is to affect their recreation. My children have not been able to play outside for two weeks because the mosquitos are out of control, despite the spraying.
Does this indicate that it doesn't work? There is a big die-down of mosqs the day after spraying, but if it rains at all, their numbers shoot back up in a day.
I don't know of any long-term plans for mosquito control. I think the system in use has been accepted and effective for the industries' demands. There are no other beekeepers in the area.
Wikipedia has some decent articles on pyrethrum and its related chemicals, including Anvil. They discuss the aeration methods and absorption levels by plants and soil. Hope this helps.
Anja