As fall approaches and nighttime temperatures begin to drop, many of us are getting ready to bring our orchids back inside. One of the most common questions I get this time of year is what to do about pests before bringing plants indoors.
My approach is simple.
First, I thoroughly spray the plants with a hose. I wash the foliage, pseudobulbs, pots, and exposed roots, and I give the potting media a good flush. Crickets, earwigs, slugs, and other pests love to hide in orchid media outdoors, and a strong rinse can help push them out. The hose will also remove beetles and other insects clinging to the plant.
After that, I spray the plants with rubbing alcohol. I typically use 90% isopropyl alcohol without diluting it and have had no issues. If you are in doubt, test a small area first.
Always do this outside because of the fumes, and keep alcohol away from flames or other ignition sources.
For me, these two steps—a thorough rinse followed by an alcohol spray—take care of most outdoor pests without immediately reaching for a systemic pesticide.
