Re: Propane-powered mosquito traps
As part of my prior business I was a propane dispenser. Everything I've heard about the propane-powered mosquito traps says they work. The first was the Mosquito Magnet. There are imitators, now. I'm not in the business now, so my contacts are not as up to date, but a year ago, what I was hearing was that the imitators were not as good. However, I note that one of my most trusted former distributors is now handling another brand; they have a reputation for handling only good products; I want to talk to the rep about these because they're cheaper.
Which brings up the other side of the problem...yes, they will give you relief, both from mosquitos and your wallet. The original brand ran from $900 to $1200 and was rated for either 1/2 or 1 acre. They use a 20# cylinder of propane in approximately 3 weeks and a $12 replacement oxygnenator tablet every 4 weeks. So, if you do the maintenance yourself, they will cost about $30 per month to operate. The trap needs to be cleaned out frequently, as much as every day during heavy mosquito season (that's because they do work!) They can't be turned on every once in a while. They need to run for several weeks before the mosquito season, and run continuously until the season is past. Some propane dealers offer monthly contracts to replace the propane and tablet; they probably run ~$50/month.
They need to be placed downwind of the protected area to be most effective, and you may need more than one to be sure you have effective coverage if your wind shifts frequently (while putting them upwind might seem to be the intuitive way to place them, so the carbon dixide odors are carried to the mosquitos, mosquitos are not good flyers and may not be able to battle the breeze to get to the unit...thus placing them downwind is most effective).