I'm not surprised that the state recanted its position on the relative efficacy of larvacide for mosquito control. Larvacide is more expensive for the state to provide for blanket applications. The author of last Tuesday's letter on this topic described to me the large cost of applying larvacide to a sizable body of water. Why would they use larvacide at all if it were more expensive and not more effective?
Since Danville doesn't have a large lake that it wants to treat with chemicals, larvacide wouldn't involve high costs here anyway. Unlike adulticide, larvacide need not be applied everywhere in town. Minnows devour mosquito larva and are cheap alternatives for treating the bodies of water that we do have. We would only need larvacide to target the low-lying areas that won't support minnows.
State officials face unfortunate pressure from people who think that chemicals are the only way to go, but we can be smarter than that. Chemicals cause imbalance in the ecosystem. Adulticides in particular threaten to do more harm than good by eliminating the natural predators that normally keep mosquitoes in check.