This document provides the conclusions of pest survey card that was prepared in context EFSA mandate on plant surveillance (M-2020-0114) at request European Commission. The full for Cryphonectria parasitica is published and available online Plant Pest Survey Cards Gallery following link will be updated whenever new information becomes available: https://efsa.europa.eu/plants/planthealth/monitor...

Several species of mitosporic fungi collected from Guilan and Mazandaran provinces were examined and as a result, four species viz.,Pestalotiopsis acaciae (on Diospyros lotus), Prathigada condensata (on Gleditschia caspica), Stigmella effigurata (on Castanea sativa), Teratosperma uniappendiculatum (on perthecia of Cryphonectria parasitica) are reported as new records for Iranian mycobiota. More...

We reconstructed the invasion history of the fungal virus Cryphonectria hypovirus 1 (CHV-1) in Europe, which infects the chestnut blight fungus Cryphonectria parasitica. The pattern of virus evolution was inferred based on nucleotide sequence variation from isolates sampled across a wide area in Europe at different points in time. Phylogeny and time estimates suggested that CHV-1 was introduced...

to evaluate fertility status and mating type distribution of cryphonectria parasitica, causal agent of chestnut blight in guilan province, four sites in two main growing regions of: shaft (visrud, taleghan and babarekab), and rezvanshahr (doran) were investigated. during the study, fifty four isolates of c. parasitica were examined. c. parasitica isolates were crossed with each of the two matin...

Exotic, invasive pathogens have emerged repeatedly and continue to emerge to threaten the world's forests. Ecosystem structure and function can be permanently changed when keystone tree species such as the American chestnut (Castanea dentata) are eliminated from a whole range by disease. The fungal ascomycete pathogen Cryphonectria parasitica is responsible for causing chestnut blight. Once the...

A filamentous fungus Cryphonectria parasitica (Murrill) Barr. is the causal agent of the chestnut blight disease. This fungus has some hypovirulent strains. These strains are known to be infected by viruses. To date, many species of viruses have been found to be associated with C. parasitica strains. The number genome segments, their relative size, titer and sequence homology as well as the eff...

The ascomycete Cryphonectria parasitica causes destructive chestnut blight, which is controllable by hypovirulence-conferring viruses infecting the fungus. tripartite chestnut/ C. /virus pathosystem involves dynamic interactions of their genetic elements, i.e., virus transmission and lateral transfer nuclear mitochondrial genomes between fungal strains via anastomosis occurring in trees.

The most widely used method for determination of sexual compatibility between two isolates of Cryphonectria parasitica (C.p.) involves co-inoculation of the strains into dormant American chestnut stems. The method is timeconsuming (requiring an average 8-10 weeks for observable perithecial necks of the fungus in chestnut bark) and needs a ready supply of suitably-sized dormant stem pieces. The ...

Strains of the chestnut blight fungus Cryphonectria parasitica harboring RNA viruses of the genus Hypovirus exhibit significantly reduced levels of virulence (called hypovirulence). The accumulation of a heterotrimeric GTP-binding protein (G protein) alpha subunit of the Gi class was found to be reduced in hypovirus-containing C. parasitica strains. Transgenic cosuppression, a phenomenon freque...

We have developed a tool for controlled expression of heterologous or ectopic genes in the chestnut pathogen Cryphonectria parasitica using the promoter region from a putative copper-regulated transporter gene. In addition, we have found that expression control via this system is not affected by the virulence-attenuating hypovirus CHV1-EP713.