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Virus classification
Group: Group III (dsRNA)
Order: Unassigned
Family: Hypoviridae
Genus: Hypovirus
Type species
Cryphonectria hypovirus 1

Hypovirus is a genus of viruses that infect fungi. The genus contains four species: Cryphonectria hypovirus 1, Cryphonectria hypovirus 2, Cryphonectria hypovirus 3 and Cryphonectria hypovirus 4. These are double stranded RNA viruses.

CHV1 - Chestnut blight hypovirulence[edit]

Hypovirus CHV1 is the only hypovirus found in Europe up to 2000.[1] It is known for reducing the virulence of the fungus that causes chestnut blight (i.e. hypovirulence).[2] Cryptonectria parasitica, the ascomycete fungus, originated in Asia and causes the disease chestnut blight in several chestnut species (Castanea sp.). Although symptoms are mild in Asian chestnut species that have co-evolved with the fungus, they are very severe in the North American chestnut species C. dentata and also in the European sweet chestnut, C. sativa.[3] Hypovirus has been used for protection against chestnut blight in Europe since the 1970s.[1]


  1. ^ a b Peever, Tobin; Liu, Yir-Chung; Cortese, Paolo; Milgroom, Michael (November 2000). "Variation in Tolerance and Virulence in the Chestnut Blight Fungus-Hypovirus Interaction". Applied and Environmental Microbiology 66 (11): 4863–4869. doi:10.1128/AEM.66.11.4863-4869.2000. Retrieved 13 August 2014. 
  2. ^ Choi, Gil. "Hypovirulence of Chestnut Blight Fungus Conferred by an Infectious Viral cDNA". Science 257: 800–803. doi:10.1126/science.1496400. 
  3. ^ "Sweet chestnut blight (Cryphonectria parasitica)". Forestry Commission, UK. Retrieved 13 August 2014.