This is a general tool for helping people understand some of the interactions between aphids and Barley yellow dwarf virus and how they impact Kentucky's wheat crop. You should also use the printed publications: ENTFACT-121 Aphids and Barley yellow dwarf in Kentucky grown wheat and, PPFS-AG-SG-3 Barley Yellow Dwarf. Also, a web based scouting game is available. " The Case of the Alien Abduction". This is a BYDV training game from the UK IPM web site. By the way, Barley Yellow Dwarf virus (BYDV) is a disease causing microorganism, Barley Yellow Dwarf (BYD) is the disease caused by this virus.