Answer: If the pests are on the undersides of the leaves and the flower clusters, I think you're dealing with black bean aphids. These tiny little insects will enlarge as they grow. Before treating the problem, try looking at the little fellas with a magnifying glass. Scales are hard and round; aphids are soft and somewhat elongated. Either can be sprayed off with plain water from the hose. Aphids can be eliminated with Insecticidal Soap. Scales can be pried off with your fingernails.
Best wishes with your new tree!
Q&A Library Searching Tips