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Matt from Wilmington, Nc writes

Is the Crystal Blue Copper Sulfate formulation safe to kill lichen/algae growing on a live oak tree?

If safe, how to formulate mixture for backpack sprayer.


No, Crystal Blue Copper Sulfate is no longer labeled for an application on trees or other vegetation. Keep in mind that lichen do not cause any harm to host trees.

Answer last updated on: 10/28/2016

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