Phytophthora hedraiandra occurs on rhododendron in Slovenia

Publication Date

Fri, 15 Sep 2006, 00:00

Last Updated

Sept. 14, 2006, 9:01 a.m.

Report Number

SVN-02/3

Country

Slovenia

Pest Id

Phytophthora hedraiandra - (PHYTHD)

Report Status

Final

Hosts

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

Geographical Distribution

Kranj - Gorenjska region (central Slovenia)

Summary

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.

Report files

Website

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