According to Colorado State University Extension, Cymbidium orchids are native to Australia and Asia. Characterized by thick, waxy petals and flowers in varying sizes, Cymbidium orchids are susceptible to diseases that cause brown spots to develop on leaves and flowers.
Types
Brown spots on Cymbidium orchids are often due to nutritional deficiencies. Overfertilizing orchids is a common cause of brown spots. Fungal diseases such as Anthracnose and rust cause brown spots on older orchids. Brown spot causes brown, water-soaked lesions to appear on orchid leaves."
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