Neem oil and Insecticidal Soap did not work. Neem is what I always try first because it is recommended for organic control. I don't like using chemicals but I also can't afford to lose all my stock plants either. Mimi's Greenhouse Nursery would be out of business without my stock plants for making cuttings and new plants to sell.
After about six weeks I resorted to Malathion spray on underside of leaves. I was careful not to use this around where the butterflies and Humming Birds were feeding. The before and after can be seen on the two plants below. The top growth is healthy - Finally! If this had only been on a few plants I would have let them be and hoped for regrowth in the late fall but it was all over my plants both in the ground and potted plants - spreading since May!
If any of you have any idea what this pest is, I'd appreciate a comment.
|new growth on Hibiscus|
|Angel Trumpet getting new healthy leaves|