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Blackspot usually results in defoliation, Victoria, not in the plant falling over. But it is a nasty thing and can quickly spread through an entire rose garden, as you have unfortunately seen. Defoliation brought on by blackspot is worst during wet weather, especially humid weather (which, of course, you have very little of in Georgia-LOL!). Once blackspot is present, new spores generate
If you have had a problem with blackspot on these roses before, you may want to consider replacing them with blackspot-resistant varieties, as that, and meticulous horticultural practices, are the best defense against the disease.
I suggest you check out this article from Ohio State University Extension. It lists blackspot-resistant varieties, but keep in mind that there are localized strains of the disease, so you may want to consult with your local nursery or rose society as well. Good luck!