There are many insects that tend to attack the Hibiscus plant. These include aphids, ants, mealy bugs and spider mites. The ants are merely looking for the aphids, because they eat a substance that aphids produce. Get rid of the aphids, and the ants will leave on their own. Spider mites may require a miticide in order to get them under control. Mealy bugs and many other insects, including aphids and ants, can be exterminated safely and effectively by just using a simple soap-and-water spray.
Squirt three to five drops of the dishwashing liquid into the spray bottle.
Fill the bottle with water from your faucet and screw on the lid.
Shake it to create more soap suds.
Spray the plant wherever you see insects.
Wash the soapy water and dead insects off of the plant.
Repeat every day for a week or so, to ensure that new hatching insects are exterminated.
Spray with insecticidal soap if the problem persists for longer than two weeks with the use of the soapy water spray.