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Hark Orchideen - Competence in Orchids  
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Biology Damage Control Pictures
False spider mites, orchid mites (Tenuipalpidae)
Tenuipalpidae are 0.25-0.3 mm long, usually greenish to reddish coloured flat oval mites that are barely visible to the naked eye. They are relatively slow and appear to be almost immobile. The pest slowly spreads in the plant stand, when damage is visible, infestation is usually considerable already. The mites do not build any webs. Three species are particularly harmful to orchids: the bunch mite (Brevipalpus californicus Banks), Brevipalpus obovatus Donn. and the phalaenopsis mite (Tenuipalpus pacificus Baker). The entire development cycle is 4-6 weeks for Brevipalpus and 2 to 3 months for Tenuipalpus depending on the temperature and humidity. Brevipalpus obovatus tend to mass propagation in temperatures above 21°C. The animals live on parts of the plant, but the main damage is done to the underside of the leaf. Large amounts are usually found along the leaves veins. The mites are often introduced into the greenhouses on plant material, especially from tropical and subtropical areas.
  Hark-Orchideen - Competence in Orchids