Has anyone had experience in growing David Austin's small rambler 'Open Arms'? I am having no end of trouble this year with yellowing leaves which seems like blackspot. After spraying it first time round a few weeks ago, I thought I had beaten it, but it's come back with a vengeance again. It's showing plenty of buds, but the way it's going it will be leafless, because they just fall off. I was just wondering if anyone else has had similar problems with this rose.