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Hark Orchideen - Competence in Orchids  
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Your position: Information on crop protection > Overview > Anthracnose > Biology  « backprint
Biology Damage Control Pictures
Anthracnose on orchids is caused by the weed mould Colletotrichum gloeosporioides Penzig (= Glomerella cingulata [Ston.] Spauld et Schrenk). It appears in glasshouses when humidity is high or when the leaves have been wet for a long time. Circular spore deposits are found on leaves and the spores are spread in the stand when there is constantly high humidity or wet leaves. Water sprinkling is the most common form of spreading. Infection via the roots is not possible.
  Hark-Orchideen - Competence in Orchids