Mold on Phalaenopsis Leaves: Mealybugs vs. Fungus—How to Tell and Treat

Question:

I have mold on my Phalaenopsis leaves. Leaves are glossy, new roots appearing—otherwise healthy. What to do?

Answer:

Hello Michele,

If mold is white, it's likely mealybugs—get rid of them before they suck the life out. Wipe leaves with isopropyl alcohol on soft cloth/paper towel, base to tip, including undersides. Monitor for recurrence—they're persistent.

If mold is black and sooty, it's fungus/bacteria. Remove entire affected leaf with sterile cutter at base. Hopefully caught early before spreading.

Jim Kawasaki
San Jose, CA