HOMEMADE MOSQUITO TRAP: 1 cup of water 1/4 cup of brown sugar 1 gram of yeast 1 2-liter bottle Cut the plastic bottle in half. Mix brown sugar with hot water. Let cool. When cold, pour in the bottom half of the bottle. Add the yeast. It creates carbon dioxide Place the funnel part, upside down, into the other half of the bottle, taping them together is ok. Wrap the bottle with something black, leaving the top uncovered, and place it outside in an area away from your normal gathering area.