Invasive Species Compendium

Detailed coverage of invasive species threatening livelihoods and the environment worldwide

Abstract

First report of stem canker of Salsola tragus caused by Diaporthe eres in Russia.

Abstract

In September 2007, dying Salsola tragus [Salsola kali subsp. tragus] plants were found along the Azov Sea at Chushka, Russia. Dying plants had irregular, necrotic, canker-like lesions near the base of the stems and most stems showed girdling and cracking. Stem lesions were dark brown and contained brown pycnidia and extending along lesion-free sections of the stems and basal portions of leaves. Based on cultural characteristics, the pathogen was identified as Phomopsis, conidial state of Diaporthe. A comparison with available sequences in GenBank using BLAST found 528 of 529 identities with the internal transcribed spacer (ITS) sequence of an authentic and vouchered Diaporthe eres (GenBank DQ491514; BPI 748435; CBS 109767). Upon conducting pathogenicity tests, the Phomopsis state was recovered from all disease plants. This isolate of D. eres is a potential biological control agent of S. tragus in the USA. This is thought to be the first report of stem canker on S. tragus caused by D. eres.