Prepare the Bottle
Cut the plastic bottle in half.
Make the Sugar Solution
Warm the water slightly and stir in the brown sugar until dissolved.
Let the mixture cool to lukewarm.
Add Yeast
Pour the sugar water into the bottom half of the bottle.
Sprinkle the dry yeast on top—no stirring required. It will slowly release carbon dioxide, attracting mosquitoes.
Assemble the Trap
Invert the top half of the bottle like a funnel and place it into the bottom half.
Align the cut edges for a secure fit.
Wrap and Place
