(Creates carbon dioxide which attracts mosquitos.)
Take a 2-liter soda bottle, and cut the bottle horizontally about 2/3 up from the bottom. Insert the top half, upside down, into the bottom half. Duct tape together and cover bottom with old dark sock
Mix together:
1 cup of warm water
Cup of brown sugar
When cool pour the mixture into the base of bottle.
Add a teaspoon of baker's yeast.
Place around yard away from where you sit. Change out the mixture approximately every 2 weeks.