Bought this rose last summer, been kept in a large pot. Was outside most of the winter except when we got some -10 degree weather it went into the garage for a bit. I went to prune it back today and found a lot of these "sores" along all the stems. The plant seems healthy otherwise and has a lot of new growth coming in (lower leaves are missing due to caterpillars from last year). Any idea what this is from?
by whatwedointheupdog