What Are Tiny Black Specks on My Hibiscus Buds
How do I handle them?
They are likely aphids, though they could be scale or thrips as well. Fortunately all of these pests are treated the same way. You can treat the plant with an insecticide. I like neem oil (often sold in stores as fruit tree spray, check the label.) It is organic and very effective on these pests, plus it treats the plant for other issues like mites and fungus. Here is more information: https://www.gardeningknowhow.com/plant-problems/pests/pesticides/neem-oil-uses.htm