Valsa malicola detected in Victoria, Australia

Publication Date
Tue, 01 Feb 2011, 01:00
Last Updated
June 30, 2015, 8:19 a.m.
Report Number
AUS-44/4
Country
Australia
Pest Id
Valsa malicola - (VALSMC)
Report Status
Final
Hosts
Malus domestica cv Granny Smith
Pest Status
  • Present: at low prevalence
  • Unknown
Geographical Distribution
Yarra Valley, Victoria , Australia Possibly common in Australia as all Valsa/Cytospora species are difficult or impossible to identify based on morphology. Valsa ambiens is common on apple in Australia and some of these records could be V. malicola.
Summary

V. malicola is associated with dieback of Malus twigs, especially those weakened by other factors, for example when frozen, burnt, wounded, injured by insects or attacked by other pathogens.

It is found on dead or dying twigs of Maloideae (Cotoneaster, Crataegus, Cydonia, Malus, Pyracantha, Pyrus, Rosa) but only infrequently on other members of the Rosaceae (e.g. Prunus) when it is present mainly as the anamorph. Both conidia and ascospores are air-borne, especially under humid conditions. Brightly coloured droplets or tendrils of conidia are often exuded from conidiomata after rain.

It is found in Asia: Armenia, Azerbaijan, China, Republic of Georgia, Kazakhstan, Russia. Europe: Austria, Czech Republic, Germany, Italy, Latvia, Lithuania, Portugal, Rumania, Russia, Slovakia, Sweden, Switzerland, UK, Ukraine. North America.

Danger
Valsa malicola was detected in an apple orchard on a mature tree during a survey. The fungus was affecting twigs and possibly branches. It is a weak opportunistic pathogen that usually has no effect on fruit production.
Contact for info
Australian Chief Plant Protection Officer Australian Government Department of Agriculture, GPO Box 858 Canberra ACT 2601 Australia ippc.contactpoint@agriculture.gov.au
Issue keywords
Pest status:Present/Presence
Commodity keywords

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