Trailnut wrote:
Looks like Powdery mildew. Have had lots of this in my yard in Goleta. Use fungicide. Dr, Earth brand is good. Enjoy your posts. Hope you get that osprey with a fish!
Barbara
Actually looks more like whiteflies. They love hibiscus. Mulching with worm castings (available at any nursery) will solve the problem without using insecticides.