Leaves are turning gray-brown with webbing between leaves and stems.
Hello and thanks for your question. It sounds like you have a nasty case of Spider Mites on your roses. One of the tell-tale signs is that webbing you mention. They live by sucking the juices out of the leaves. Get enough of them and they will destroy the foliage. Here is a link to an article I wrote about getting them under control: https://www.gardeningknowhow.com/ornamental/flowers/roses/rose-spider-mites.htm Please do let me know how things go.
Stan The Rose Man :-)