I would remove all the problem foliage, of course, and also cut out any other plant parts that are obviously diseased (such as with black lesions, like the ones in the photo below from the Royal Hort Society in the UK):
As for cutting the plant to the ground in high summer, it seems extreme. Again, I’d remove wood that has those scabby spots as it appears, and this fall I’d clean up very, very carefully, paying extra-close attention to any wood that may need removing then as well.
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Welcome! I’m Margaret Roach, a leading garden writer for 25 years—at ‘Martha Stewart Living,’ ‘Newsday,’ and in three books. I host a public-radio podcast; I also lecture, plus hold tours at my 2.3-acre Hudson Valley (NY) Zone 5B garden, and always say no to chemicals and yes to great plants.