Seems there's more to the multiflora rose (Rosa multiflora) than its weedy ways. According to this report from IndyStar.com, a mite that is found on multiflora rose is causing garden roses to keel over. The tiny wingless Eriophyoid mite (Phyllocoptes fructiphilus) is a vector for rose rosette disease (RRD), which affects multiflora rose and has spread to planted rose species as well. There is no known cure once a plant is infected. The organism that causes RRD was once considered for use as a biological control of the multiflora rose.