Yes. Copper sulphate in certain formulations is approved for bacterial
canker, bacterial spot. Most effective for brown rot of fruits. There
are also copper hydroxide and copper oxychloride formulations .

One other question: Copper is a fungicide but does it have
anti-bacterial actions as I was under the impression that canker can be
cuased by bacteria? Though the RHS site recommends copper for canker on
fruit trees.
Just checking Im applying a correct therapy.

Ed




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gasdoctor