Were I grew up some of my friends were Pennsylvania Dutch. I learned some amazing systems they used. I ran across one recently: hanging a bag or mason jar of water to repel flys. It worked as they never had a fly in their house. This patent explains it: http://patft.uspto.gov/netacgi/nph-Parser?Sect1=PTO1&Sect2=HITOFF&p=1&u=/netahtml/PTO/srchnum.html&r=1&f=G&l=50&d=PALL&s1=9565845.PN ….pic.twitter.com/CFfSRDhsuy