How do you treat orchids that are infested with Pythium or Fusarium?

Hi Ian,

Good drainage is critical to stop the spread of the disease. Fongarid can control phytophthora and pythium however if the disease is Fusarium the treatment is Anti Rot. Excessive use of fungicides can upset the symbiotic relationship that orchids have with mycorrhizal fungi. These fungi help the orchids take up the nutrients. Your local orchid society may also have some tips on the treatment of diseases and left spots.