Hi, Thanks for the suggestion, unfortunately it does not work for me, tried it once, it burnt all the leaves of my roses and left a nasty residue, due to my very changeable climate, probably, particularly very hot daytime temps - the roses also being in a south-facing border. Just made matters worse, couldn’t get the stuff off and more leaves died of it than I lost to blackspot. It’s odd, as I have successfully used it on fruit trees in the past, in a hotter climate to where I am now, but perhaps the latter have tougher leaves...
Mountainous Northern Catalunya, Spain. Hot summers, cold winters.
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