So let's begin with the number one way to lessen the presence of mosquitoes in your yard. Then if you want to read on feel free. REMOVE MOSQUITO BREEDING AREAS. Done deal. Here is a list of places to check and clean: 1) Clogged downspouts (Clean out those gutters). 2) Flush your bird bath every week or so 3) This is the big one. REMOVE OR EMPTY watering holding containers in the yard. 4) Correct poorly draining areas in the yard. Depressions, low spots, etc. A note here about