My azalea bush has a greenish hard scale on some of the limbs. What should I do?
Azalea Bush Problem
Certified GKH Gardening Expert
Is it a greenish blue insect scale or a greenish blue substance that looks like scales? If it is an insect, try neem oil. I have found that useful on scale. This article will help with that: https://www.gardeningknowhow.com/problems/pests/neem-oil-uses.htm If it is a substance, then it is likely lichen, which can be unsightly but does not kill plants. This article has more info: https://www.gardeningknowhow.com/ornamental/fungus-lichen/treatment-tree-lichen.htm