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Hark Orchideen - Competence in Orchids  
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Tarsonemids (Tarsonemidae)
Very small, about 0.2-0.3 mm long, elliptic, transparent mites that live hidden directly at the vegetation point, i.e. in the heart of the plants. Their fourth pair of legs is always different from the third one, in Tarsonemus pallidus Banks it is markedly stronger. The mites multiply in high temperatures and high relative humidity. Development from egg to adult takes about 14 days in temperatures between 20 and 25° C. The mites are sensitive to light and prefer young soft plant tissue.
  Hark-Orchideen - Competence in Orchids