Several of my large pine trees have developed blue/green scales on their trunks and branches along with a feathery, silver coating on their boughs. Can you diagnose the disease and identify treatment options? This also have spread to my rose of sharon bushes along their trunks.

I suspect the feathery silver coating on the branches is pine bark adelgid, which is an insect pest. I am not sure of the blue/green scales: this is likely and harmless lichen or algae growing on the bark. Contact us to make an appointment and we can likely verify the causal agent.




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