Hibiscus can attract the same pests as roses.  Aphids, white flies, mites, and snails might find your Hibiscus to be a fine home.  Before breaking out the arsenal of deadly chemicals, try using more benign remedies. 

For most pests, spraying your Hibiscus with a hose will keep the critters at bay.  Don't forget to spray the underside of the leaves where most of these pests are hiding.  Besides, tropical Hibiscus enjoy a spray of water occasionally. 

Remember not to spray them in the heat of mid-day, in full sun, as it might burn the leaves.  A drop of dish soap in a small water sprayer also works pretty well for most of the sucking insects. If this does not take care of your pest problem, a stronger insecticide like Bayer Advanced 3-1 or Ortho Systemic insect killer would work for you. These products are usually available at your local Lowe's, Home Depot or favorite garden center. We have these products in stock as well if you have a hard time finding them. Please remember to take caution when using these products and follow their instructions.

The two most important plant diseases that most will encounter are tip die back and root rot. 

An indication of root rot is that the plant will look wilted when the soil is wet and the plant has not been through a drought.  It is obvious that the roots are no longer working providing water to the leaves.  You should take the plant out of the pot and look at the roots.  Smell them... unusual I know! If they smell healthy and look white, they are fine.  But if they look water logged, blackened and smell like decaying organic matter there is a problem.