The following will make a six 18inch strips of fly paper that will be irresistible to flies.
4 fl oz Golden Syrup
1 tablespoon dark brown sugar
1 tablespoon granulated sugar
Combine the ingredients in a small bowl and then place six 18 inch strips of brown paper in a flat container and cover them with the sticky mixture. Leave them to soak overnight. Next day scrape off all the excess mixture make a little hole in one end and insert a string. Hang near open doorways and windows.