I picked this up off someone on Facebook, who is possibly called Cairns or Charlotte. There was an illustration with it, but it didn't transfer over to the forum so I have tried to explain the trap as explicitly as possible. Hope this works for those plagued by mosquitoes.
Items needed:
200 ml hot water
50 grams of brown sugar,
1 gram of yeast
2 litre plastic bottle - the type you buy soft drinks in, i.e. coca cola, lemonade, etc.
Cut the plastic bottle into two - 2/3 for the base leaving one third for the top “funnel” part.
Dissolve brown sugar in hot water. Let cool. When cold, pour into the bottom half of the bottle.
Add the yeast. No need to mix.
Up end the top of the bottle into the base / bottom half of the bottle so that the small (screw cap end) opening is at the bottom of the “funnel” and its cut side opening is on the top and the whole is pushed fully into the bottom half of the bottle ensuring that the small opening is above the water / yeast mixture – that’s a lot of words to say, turn the top half of the bottle upside down and stuff it into the bottom half of the bottle!
Wrap the bottle with something black or dark, but keep the top fully open, and leave in some corner of your house. Check it after a week or two to see if needs to be renewed / replaced.