I live in a dry AZ area, and mosquitos are there, but not too much of a problem. My primary issue was having hundreds of moths outside my patio door on any given night. Sure, flies and mosquitos are there too, but the moths are too many. I was delightfully surprised that this product attracts and kills any flying insect, from mosquitos to even large moths. The first night I had it on (I have a dusk-dawn power adapter outside for this zapper), it killed bugs the entire night - at a rate of about 2 per second, I kid you not!. In the morning I saw that there were dozens of dead moths inside the lamp enclosure. The only "downside" here is that I had to use my leaf blower to clear it out. Took about 5 seconds, and I'm hoping that over time, the moth population here, at least the ones in my immediate vicinity dies out. This is a great product!