Answer: Both Dursban and Orthene are registered for use against mealybugs in Hawaii. Be sure to read the labels to make sure they are safe to use on hibiscus. Or, you can try swabbing the pests with a Q-tip dipped in rubbing alcohol. This should kill them on contact without harming your hibiscus. You may have to inspect your plants and treat several times to get all the pesky critters.
Best wishes with your hibiscus!
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