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Hark Orchideen - Competence in Orchids  
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Your position: Information on crop protection > Overview > Fusarium > Biology  « backprint
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Fusarium rot - stem and root rot
The main pest on Phalaenopsis and Paphiopedilum is Fusarium oxysporum Schlecht. The fungus forms its fungal spores on the usually whitish to pinkish spore hymenia (sporodochiae). They are either long and sickle-shaped and serve to survive (macro conidia), or they are small, globose to oval (micro conidia). The conidia spreads the infection in the stand and infests further host plants. Most parasitic Fusaria are vascular parasites, they obstruct the conducting tissue and cause wilt diseases. They are typical secondary parasites, the reasons for infestation can be too high a salt concentration, low ground temperatures, gnawing by organisms in the ground and inappropriate substrates that are too wet or contain too much peat. Fusaria and other fungi multiply particularly quick in sterile plant substrates with a high percentage of peat, because in those materials there are no other micro-organisms as natural antagonists.
  Hark-Orchideen - Competence in Orchids