The Pythium fungus is renowned for its persistence. There are various different types of Pythium fungi. Pythium aphanidermatum is one of the most well-known. It is almost impossible to prevent infection pressure from this Pythium fungus, partly because it can survive on dead organic material. A biological balance is needed to supress this fungus. For this purpose, Biopol Natural has developed the fytopro system. A Pythium infection can be easily and quickly recognised by the condition of the plant roots.