Valsa malicola detected in Victoria, Australia

Date de publication

mar, 01 Fév 2011, 00:00

Dernière mise à jour effectuée le

juin 23, 2023, 6:11 matin

Report Number

AUS-44/5

Pays

Australia

Identité de l'organisme nuisible

Valsa malicola - (VALSMC)

Situation du signalement

Final

Hôtes

Malus domestica cv Granny Smith

Pest Status (old values from ISPM 8 -1998 )

• Present: at low prevalence
• Unknown

Pest Status (ISPM 8 - 2021)

• Present: not widely distributed and not under official control

Distribution géographique

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.

Résumé

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 pour demandes d'information

Australian Chief Plant Protection Officer Australian Government Department of Agriculture, GPO Box 858 Canberra ACT 2601 Australia [email protected]

Fichiers de rapports

Site web

Mots-clés associés au thème

Pest status:Present/Presence

Mots-clés associés à la marchandise