Dear Hollasch,
Try 1 tablespoon of Dawn dishwashing soap in 1 gallon of water and pour some in spray bottle and spray on every leaf both front and back.
Repeat once a week til the plant is clear of bugs.
I love red, and plan on buying a red one next spring.
That way it will have the entire summer to grow in before I bring it in for the winter.
GOod Luck!
Carla

The little green worms are sawfly larva .. In mid to late spring a black fly with an orange head (sawfly , but really a wasp) land on the leaves and insert the eggs in leaf tissue .. The larva are constantly eating and can skeletonize the whole plant.
I use neem oil as soon as the sawfly start coming around.
2 to 3 weeks of spraying as per directions with neem.
It is a growth retardant which doesn't allow the larva to develop and of course they die.
But for me I won the sawfly battle only to have japenese beetles destroy all my blooms ..

I have 4 hibiscus plants in my yard, 2 are huge, over 4 ft tall, I bought them this year under a foot. 2 of them look like a skeleton and looks like something is eating it almost down to the ground, first the leaves then the stems. I tried 7 dusting the plants and surrounding area, then adding more fertilizer but they still look aweful. This is all happening within the last 2-3 weeks. I know it cant be the fall weather because the others are still huge and vibrant, blooming everyday. Please help, I don't really want to dig them up and start over.