Black Spot
Diplocarpon rosae
11 host plants
Circular black spots with yellow halos develop on leaves. This fungal disease favors wet foliage. Improve air circulation and remove fallen leaves.
Plant cultivars known to be resistant in your area. Note that the cultivar Carefree Spirit was the first landscape shrub to survive for 2 years in AARS tests without any fungicide and voted a winner.
Host Plants (11)
Daphne cneorum Garland Daphne, Rock Daphne, Rose Daphne
Hibiscus syriacus Rose, of Sharon Shrub, Althea
Kerria japonica Japanese Kerria Japanese Rose
Rosa acicularis Wild Prickly Rose
Rosa gymnocarpa Little Wood Rose, Wood Rose, Baldhip Rose
Rosa multiflora Multiflora Rose
Rosa nutkana Nootka Rose
Rosa pisocarpa Clustered Rose, Swap Rose
Rosa rubiginosa Sweetbriar Rose, Eglantine Rose
Rosa woodsii Woods' Rose
Spiraea douglasii Rose, Spirea