Calf hutches are notorious for producing a massive fly population in warm weather, particularly when bedded with straw or sawdust.

John Smith, extension educator in AuglaizeCounty (Ohio), says a farm he visited a few years ago had the problem well under control by:

  • Bedding the hutches with inorganic substances like sand or limestone. 
  • Setting a concrete block under one of the rear corners of each hutch, which allowed more air to circulate through and helped keep the bedding dry.