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Hark Orchideen - Competence in Orchids  
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Your position: Information on crop protection > Overview > Fusarium > Damage  « backprint
Biology Damage Control Pictures
Infections caused by Fusarium on Phalaenopsis and similar hybrids are characterised by small yellow-brown lesions on the roots. The coloured areas increase in size as patches of dry rot appear with its typical constrictions. At the neck of the root the tissue turns hard and black with dry rot. With increasing infestation the dry rot areas at the base of the leaves become larger and in high humidity pink hymenia form on the dry rot areas. The youngest leaves of Phalaenopsis become extremely reddish, there is chlorosis formation and finally the leaves fall off and the plant begins to die. Older leaves often become coriaceous and dry out. In some varieties, Fusarium can also damage the flower stalk producing sunk-in, dry rotten spots, the blossoms fall off prematurely. In Paphiopedilum, infection often affects the root insertion places and the leaf basis. Watery rot appears, the individual leaves can then often be pulled out of the leaf sheath. The disease progresses relatively slow. A stand can be infested for several months without any plants dying. The healthy part of the plant often forms a lot of new roots. But usually marked growth depressions are a sure sign of a Fusarium infection.
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