I went to water my orchids today, and noticed what I thought was white fungus on one of the Phalaenopsis, but on closer inspection, I saw an oval insect. Looking in one of my orchid books, they look like Mealybugs. The largest one is 1/4".
The book I have recommends removing with a cotton swab dipped in denatured alcohol and then spray weekly with insecticidal soap. I don't have any denatured alcohol, what can I do instead? I'd like to stay organic.
I haven't introduced any new plants in about a year, wonder how they got there! None of my other plants show any bugs yet.
Do I need to change the potting medium or sterilize the rocks in the humidity tray?