In article , says...

As has been mentioned, good horticultural practices and selelection of
resistant varieites are the best method to minimize black spot and the other
fungal diseases.

Note that the scientific name of most of the fungal diseases include the
word 'rosa' in some form. These diseases are specific to roses and are not
transmitted from non-rose plants or trees.

amen. an apple tree with blackspot is a scary thing to contemplate.















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