Cymbidium Leaf Spots: Fungus vs. Bacteria, and Preventing Spread to Phalaenopsis

Spot Diagnosis

Apply orchid-safe fungicide/bactericide (garden center).
Treat Phalaenopsis preventively too.
If spots persist: repot, divide, inspect connective tissue for black streaks (systemic bacteria). Remove affected bulbs.

Keep Cymbidium separate from Phalaenopsis during treatment. Wash hands/tools between plants.

Orchids: Cymbidium Leaf Spots & Tip Necrosis: Fungal Management; Raised Orange-Brown Spots with Sticky Residue: Scale Insects; Cymbidium Black Spots: Fungicide Soak & Repot Protocol; Botrytis on Cymbidium Flowers: Prevention and Quick Action; Non-Blooming Phalaenopsis: Repotting, Light, and Bloom Booster Strategy; Diagnosing Brown Spots on Phalaenopsis Leaves: Scale or Fungus?; Cymbidium Flowers Not Fully Opening: Cupped Blooms Are Normal for Some; Phalaenopsis in Decorative Ceramic Pot: Air Exchange, Insects, and Repotting; Cymbidium Brown Leaf Spots: Fungal Treatment and Prevention; Why Your Cymbidium Isn't Blooming: Light, Backbulbs, and Seasonal Timing

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