Phytophthora hedraiandra occurs on rhododendron in Slovenia

Date de publication

ven, 15 Sep 2006, 00:00

Dernière mise à jour effectuée le

sep. 14, 2006, 9:01 matin

Report Number

SVN-02/3

Pays

Slovenia

Identité de l'organisme nuisible

Phytophthora hedraiandra - (PHYTHD)

Situation du signalement

Final

Hôtes

Rhododendron

Pest Status (old values from ISPM 8 -1998 )

• Present: under eradication

Pest Status (ISPM 8 - 2021)

• Present: not widely distributed and under official control

Distribution géographique

Kranj - Gorenjska region (central Slovenia)

Résumé

A similar isolate was obtained in both years, which was then inoculated within four days on cornmeal agar (CMA) and incubated at 25 C. The cultures grew around 6 mm daily. A few papillate, subglobose sporangia appeared after two weeks, occurring abundantly when mycelial plugs were submerged in pond water. Oogonia were 29 -33 µm (31 µm) and oospores were 24-29 µm (26 µm); amphigynous antheridia were infrequent. The morphological characters resembled those described for Phytophthora cactorum or P. hedraiandra.

Danger

In July 2004 and July 2005, necrotic lesions on shoots were found, with dieback and wilting in severe cases, on established rhododendron bushes.

Fichiers de rapports

Site web

http://www.bspp.org.uk/ndr/jan2007/2006-64.asp