Plant virus diseases appear to be proliferating at ever-increasing rates.Over the past several years, there has been an increase in new and emerging plant virus diseases.Although these diseases likely result from natural causes, instances of deliberate introduction cannot be ruled out.New viruses that affect ornamental and vegetable crops continue to be detected with new crops introduced and grown alongside industry standards.Some of these viruses may exhibit few or no symptoms in one host, but cause significant losses in another.We present an updated list of new viruses, detected within the last decade.The list includes increased emerging virus incidence, re-emerging viruses associated with changes in management or cultivars, previously controlled infections, and chronic incidence/spreading for viruses known for longer than 20 years that are causing increased concern.Global over-population and activities that disrupt the natural ecological balances between pathogens and hosts demonstrate that, directly and indirectly, man continues to be instrumental in the spread and establishment of new diseases.In light of growing international concern for crop biosecurity, new, emerging and threatening plant viral diseases are receiving greater attention.Improved and coordinated viral disease surveillance systems, enhanced global response capacity,and education and training of a multidisciplinary workforce are needed to adequately address new and emerging viral diseases.