Help identify Gardenia problems
Our gardenia in home garden, San Diego, has problem lately, buds dropping, areas of some leaves turned to grow black spots, not sure what they are, also some white stuff like fungus. We don't see any insects, but do see a lot of tiny ants. Are the problems due to spider mites?
Have searched this forum and many others, still not sure what are black/white stuff, and how to cure. Please help,see the photo.