Phalaenopsis Orchid Wilting, Curling Leaves, and Flower Spots: Fungal Infection Treatment

A well-cared-for moth orchid, recently repotted in bark and watered via ice cubes, suddenly developed a wilting middle leaf, curling lower leaf, brown spots on flowers, and a brown leaf spot. The owner used distilled water with fertilizer and misted daily.

Diagnosis: Fungal Disease

Melissa identifies a fungal infection exacerbated by the orchid's tropical humidity needs and recent repotting stress. The ice-cube method may provide insufficient moisture for the new medium.

Treatment Plan

1. Apply a systemic fungicide containing propiconazole (spray, let dry, repeat per label).
2. Reduce misting; only mist with fungicide solution or during high heat.
3. Water thoroughly when medium is dry, not on a fixed schedule.
4. Expect new growth as a sign of recovery.

Orchids are an exception where synthetic fungicides are often warranted over organic options.