|Botryosphaeria canker||Leaves on affected branches wilt and die. Branches die back and become covered with dark-brown to black pimple-like fungal fruiting structures. Wood under the bark is dark brown.||Botryosphaeria||Plants most susceptible are those under drought stress. Therefore, irrigate to prevent drought stress. Prune infected branches.|
|Downy mildew||Angular spots limited in shape by the leaf veins form blotches that die and shrivel in the spring when the weather is wet. Severely affected leaves fall. Light- colored fungal growth sparsely covers the spots on the underside of the leaf.||Plasmopara viburni||Rake and destroy fallen leaves in the autumn. Avoid overhead irrigation in the spring. Apply a fungicide as soon as any disease is observed.|
|Powdery mildew||White fungal growth forms on the upper surface of leaves.||Erysiphe or Phyllactinia||No control is recommended since little damage occurs. If severe, apply a fungicide.|
This publication is available in alternative media on request.