Its ok on the leaves,Wash the plums tho. Depends on whether there is a
fungus on your apple tree. Copper sulphate is an old time fungicide,
still fairly effective on some fungi.
gasdoctor wrote:
Hi,

Ive just sprayed my plum and cherry with murphys traditional copper
fungicide, using the dose recommended. (My plum had canker earlier in
the season)

Its left a blue-ish powder on the leaves (copper), I havent used this
before, so is this OK or should I wash it off.

Also is it worth giving my apple a spray?

Cheers

Ed




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gasdoctor