I bought Shropshire Lad from David Austin Roses 3 (going on 4) years ago. It has always been reliable & healthy. Recently, it has succumbed to black spot which I have been spraying with suitable substance, but today I noticed that it seemed to be sprouting red stems from the root and also further up the main stem. I have taken off all these stems as they were unlike the normal stems on this rose. Now I have just discovered one leaf folded over quite tightly - I unfurled it and found white grubs? that look like tiny flecks of paper and also 2 flies with orange/yellow bodies and brown/black wings - never seen their like before.
Anyone had a similar experience/any advice please?