Thanks Hetty
Mima, I keep a spray bottle (just regular water) and wet paper towel handy when I suspect spider mites on my new or smaller plumerias. I spray the leaves to keep them moist during the day or I wipe the leaves with wet paper towel to disturb the spider mites egg production when I have more time. I usually do this task in the morning so the leaves can still air dry and I avoid doing this late afternoon. I make sure the spray will not drip too much so as not to overwater the soil of new plummies.
The big ones or well rooted plummies that can handle excess water are sprayed with the regular water hose spray. I do the same thing when I suspect spider mites on my roses.