Do you know the source of the mosquitoes that are a problem in your backyard? The ideal method of control is with a biological larvacide in the pond, pool, ditch, or other body of standing water.

There are no aerosol insecticides that will kill mosquitoes but won't do the same to other insects, amphibians, birds, and warm blooded critters like you and your pets.

I've heard of garlic repellents but don't know how well they work.

not sure of the source. I use the BT disks but I may need to use more earlier.

I put out Bt every year in the water filled borrow pits created when the town raised the road bed many years ago,and it definitely cuts back on mosquitoes but doesn’t totally eliminate them. Beyond that, having a screened sitting area or fans for unscreened outdoor areas, working outside on windy days and avoiding the morning and evening times the mosquitoes prefer, and using a combo of coverage with clothing or netting and repellent options are your best bet if you want to avoid harming beneficial insects. Also consider adding houses for bats and insect eating birds such as swallows and bluebirds.

You could use a product that has bifenthrin as the active ingredient. It will kill bees and bebeneficial insects, but if you spray late in the evening and use a two gallon sprayer you will minimize killing the wrong insect. Mosquitos like cool damp areas. They usually live below six feet so spray your mulch beds, shrubs, under deck, woodpile, brushy areas. As noted, get rid of anything holding water, like empty buckets, cans, etc. Spray about once a week. That would be a good start.

Bifenthrin? Good grief, let's not do that.

Mainegard, Bt dunks are very helpful for controlling the larvae in bodies of water. Is that what you're dealing with?