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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.

Answer:

Yes, Crystal Blue Copper Sulfate can be used to kill lichen/algae on oak trees. You would use it at a rate of 8 oz. per 3 gallons of water per the product manufacturer. They also recommend mixing in warm water so the product can disolve the best. 

Answer last updated on: 10/28/2016

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