Living in South Florida and I found these 2 methods to be efficient:

-The propane burning traps about ten mosquitoes a day. It's an expensive setup. The SkeeterVac is $600, and a $20 propane tank will last a bit less than a month.

-"Mosquito Dunks" or more specifically, BTI (Bacillus Thuringiensis Israelensis) has to be placed into standing water. Mosquitoes come to lay eggs that will die because of the BTI. I don't know how many it kills, but I've seen a demi-dozen of larvae in there at a time. Here I recommend going with the granules format as the chemical is powerful, and you don't need much of it for example if placed in a bucket. Better than having to deal with breaking down a big piece into smaller ones.