Place sachets made from small squares of cheesecloth and filled with crushed mint, bay leaf, clove or eucalyptus around the house to repel flies.
Mix 1⁄4 cup corn syrup, 1 tablespoon granulated sugar and 1 tablespoon brown sugar in a small bowl. Cut strips of brown kraft paper and soak in the sugar mixture. Let dry overnight. To hang, poke a small hole at the top of each strip and hang with string.
Plant sweet basil next to the doors, or plant in containers. The flies will stay far away. Cut a nice size bunch of it to take with you when you go on picnics. As an added bonus, mosquitoes don’t like it either.
For creating a fly-free area, apply eucalyptus essential oil to a small cloth or rag and leave it in an area plagued by flies.