White Fuzzy Mold on Orchid Roots in Terrarium: Mealybugs or Fungus?

Terrarium Risks

Growing orchids in terrariums without 24/7 fan circulation creates stagnant, humid conditions—perfect for mold and mealybugs. The "white fuzzy mold" on broken root areas needs identification.

Diagnostic Test

Try wiping with alcohol-dipped Q-tip. If it comes off easily and reveals tiny insects = mealybugs. If no insects = fungal mold from poor air circulation.

Solutions

For mold: Remove affected roots, repot in fresh mix, add a fan for constant air movement.

For mealybugs: Full eradication protocol needed (see Article 14037).

Terrarium Modification

Orchids need gentle, constant air movement. A terrarium without active ventilation will repeatedly cause these issues.