Spider Mites on alocasia
What's Happening
Spider mites (Tetranychus urticae) thrive in low-humidity conditions (<50% RH) common in heated homes, exploiting the mismatch between Alocasia's tropical native environment and indoor culture. Mites pierce leaf cells to feed, causing stippling that appears as pale dots on dark velvet leaves. Rapid reproduction (eggs hatch in 3 days) allows population explosions within 7-10 days of initial infestation.
How to Fix It
- 1
Mix spray: 1/3 isopropyl alcohol + 2/3 water + drop of mild soap; apply to undersides with soft makeup brush
- 2
Shower plant thoroughly to dislodge webs and mites before chemical treatment
- 3
Repeat treatment every 5-7 days for 3 cycles to interrupt egg-to-adult lifecycle
- 4
Boost humidity to 60-70% immediately post-treatment using humidifier or pebble tray
- 5
Inspect with 10x loupe weekly for 4 weeks; re-treat at first sign of recurrence
How to Prevent It
Maintain 60-80% humidity year-round; mist leaves daily in dry seasons; quarantine new plants 2 weeks; inspect undersides weekly with magnification; avoid placing near heating vents or AC units