Fungicides are biocidal chemical compounds or biological organisms used to kill or inhibit fungi or fungal spores. Having a solid fungicide program in place to protect your golf course from diseases is essential.  Applying well-timed fungicide applications before physical symptoms develop is ideal, with the correct timing.   Once a fungal infection such as Brown patch, Grey leaf spot, or Pythium Root Rot has been detected on a golf course, a mixture of fungicides should be applied as quickly as possible to minimize spread of the infection as well as start the healing process on the infected area.   Use a contact fungicide to quickly limit the spread of the infection, and a systematic fungicide to protect emerging leaf tissue.   Fungicide application intervals should be increased for several weeks following the outbreak to facilitate the turf’s recovery.