Doublefile viburnum, known botanically as Viburnum plicatum, is a deciduous flowering shrub often grown in a tree form. Growing to a maximum of 12 feet in height, it produces large lacy white flowers in April and May and deep bluish black berries in the fall and winter. In addition to its flowers, it is prized for its canopy shape that sports outward-facing branches that look as if they are hovering parallel to the ground. The foliage turns color in the fall from a mid-tone green to dark bronze purple before being shed in winter.
Basal Trunk Canker
Basel trunk canker is a fungal disease that attacks and kills patches of woody trunk and stem tissues of doublefile viburnum. It can be deadly to the plant over time if left untreated. Canker is an opportunistic disease that attacks plants that are already under environmental, insect or some other stress.
Botrytis or gray mold spores multiply on decaying plant litter, and when washed up onto viburnum plant tissues they infect and colonize compromised woody tissues and foliage. A thin furry coating of gray mold will appear in splotches and then cover larger areas over time. Flowers and leaves will develop brown wet spots and rot. It is most prevalent in settings that are very humid or have rainy weather, little sun and poor fresh air circulation.
Leaf scorch occurs from a range of problems having to do with moisture uptake in the plant and often with concurrent heat stress. Under-watering, high winds, root disruption, poor soil condition, root compaction and transplant stress can all be pre-conditons for leaf scorch. Leaf scorch is characterized by brown crispy leaf tips and wilting plant tissues.