The damage potential from the beetle is quite extensive, if not managed.
Viburnum leaf beetle, Pyrrhalta viburni (Paykull), is a chrysomelid beetle that feeds on leaves of viburnum. First introduced from Europe to Ontario, Canada in 1947, it has spread and is reported from Connecticut, Maine, Massachusetts, New Hampshire, New Jersey, New York, Pennsylvania, Ohio and Vermont. The beetle has been found in several sites in Washington State and in British Columbia. Populations are trending downward because predator insects and nematodes that affect the larva in the soil have built up and found the beetle as a food source.
Paul Weston, Cornell University, Milan Zubrik, Forest Research Institute, Slovakia, Bugwood.org