Homemade Fly Trap

Take any jar and squirt some jelly inside. Put a funnel in the jar. Some flies will go into the jar through the funnel and some will hang around the outside lid of the jar. Vacuum the outside flies, then lift the funnel a bit and vacuum the inside flies that are still flying around, not the ones that have died. When you vacuum the flies from the jar, look around the room, near the ceiling for other flies, and vacuum them too.

Now, locate the food source of the flies. It could be a compost pail, a garbage pail, cat litter or even a piece of fruit that has fallen behind the stove. Once you have gotten rid of your current infestation, change the litter, compost, etc. every 6 or 7 days. This will prevent any fly maggots from maturing to the adult stage, because it takes them at least 8 days.

You can use a similar process for killing outdoor mosquitoes. Give them one or more dishes of water, placed in the shade, like under a bush. The female will lay her eggs in the water. Change the water every six days, which is not long enough for the eggs to hatch.