Can you identify this disease on my tropical plants?
Mealybugs are insects that have white, waxy filaments protruding from the tail end, and look as though they’ve been dusted with flour. Mealybugs are often found on the underside of leaves and below the soil surface on the main stem. Washing, physical removal, disulfoton, bifenthrin, permethrin, imidacloprid resmethrin, pyrethrins (at least two to three applications sprayed once every 10 - 14 days) are usually necessary.
Here is a resource on mealybugs: Mealy Bugs on Houseplants