Odontoglossum Post-Repot Decline: Fungus Gnats, Root Rot, and Rest Period Neglect

Diagnosing the Decline

Leaves dying one by one after repot + fungus gnats = medium staying too wet → root rot. Fungus gnats breed in soggy medium—they're a symptom, not the cause.

Immediate Correction

1. Repot AGAIN in fresh, coarse orchid bark mix (your current mix is breaking down too fast).
2. Inspect roots: Rinse, trim ALL mushy/stringy roots.
3. Respect the rest period: Odontoglossums need very little water when not in active growth. Pseudobulbs sustain them.
4. Water heavily ONLY during active growth (new roots/leaves emerging).
5. Know your type: Cool-growing vs. warm-growing Odontoglossums need different temps.

Leaf Loss vs. Root Loss

Leaves are expendable—pseudobulbs store the energy. Roots are critical. Healthy pseudobulbs + healthy roots = recovery. Healthy pseudobulbs + dead roots = decline.

Fungus Gnat Control

• Yellow sticky traps for adults.
• Mosquito bits (Bti) in water for larvae.
• Fix the real issue: soggy medium.