Phalaenopsis Dark Green Soft Spots: Bacterial Infection Emergency

Phalaenopsis in bright indirect light (Germany) develops expanding dark green soft spots on older leaves, then white specks, yellowing. You removed affected leaves. Worried about fungus.

Bacterial, Not Fungal

Dark green expanding soft spots = bacterial infection. Fungal spots are typically black. You did right removing leaves.

Critical: Sterile Tools

Use a new sterile blade for EACH cut (industrial single-edge razors). Reusing spreads bacteria.

Treatment

Apply bactericide recommended for orchids (check local garden center). Follow safety directions.