Phytophthora austrocedrae

Publication Date
Wed, 20 Jul 2011, 00:00
Last Updated
July 19, 2011, 9:01 a.m.
Report Number
GBR-24/2
Country
United Kingdom
Pest Id
Phytophthora austrocedrae - (PHYTAU)
Report Status
Final
Hosts
Chamaecyparis nootkatensis – Nootka cypress.
Pest Status
  • Present: under eradication
Geographical Distribution
Found in one location in Scotland
Summary

Dieback was noted on 3 Chamaecyparis lawsoniana - Lawson^^s cypress and 2 Chamaecyparis nootkatensis - Nootka cypress.

The affected trees also showed similar symptoms to previous findings of Phytopthora lateralis on Lawsona^^s cypress some having fresh basal lesions yielding a positive test for Phytophthora with a Lateral Flow Device (LFD).

One tree had branch dieback. Positive samples were then tested further using Phytophthora-specific PCR primers which were tested on DNA extracted from bark. Resulting sequences were analysed to determine Phytophthora species. One isolate from C. nootkatensis gave 100% and 99% sequence matches to Phytophthora. austrocedrae.

Culturing from the material yielded an isolate which was confirmed as P. austrocedrae based on culture morphology and DNA analysis.

On the same site there were also 2 positive identifications for Phytophthora cambivora made on Chamaecyparis lawsoniana and 1 positive identification for Phytophthora lateralis made on C. lawsoniana.

Danger
None - outbreak is contained and plants have been destroyed
Report files
Website

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