I've been smoking cigars and coding out in my backyard lately, I just recently moved from the beach to a half an hour inland and the mosquitoes are eating me alive at dusk.
I went on to Amazon to try to find something cheap and efficient and I decided to go with citronella incense sticks to try to keep the mosquitoes at bay.
The recommended usage is to make a 12'x12' square and putting one stick in each corner of the square and sitting in the middle of it. That seems like a bit of a waste so I am trying just one stick within a few feet.
You have to stick the incense in a sand bucket or something so it can burn down but not tip over from wind and start a fire.