We often see DSV with the signs of insect feeding, but I at least, have not seen this kind of diseased looking DSV. There were several plants growing between dame's rocket (a mustard) and goldenrod. The goldenrod leaves were also yellowing. It may be something in the soil at that site, or it may be something else. We are always hopeful we will see something that will finally get the better of this invasive species. So, we've left the plants standing and will monitor to see what, if anything, happens.