Invasive Species Compendium

Detailed coverage of invasive species threatening livelihoods and the environment worldwide

Abstract

First report of a 'Candidatus Phytoplasma Australasia'-related strain (16SrII-D subgroup) associated with alfalfa leaf chlorosis disease in Turkey.

Abstract

In recent years, alfalfa plants have exhibited disease symptoms including the production of small leaves, leaf chlorosis and witches' broom. Samples were collected from diseased plants to determine if a phytoplasma was associated with these symptoms. Results of molecular investigations revealed the presence of a 'Candidatus Phytoplasma australasia'-related strain. Damaging witches' broom diseases were reported several times in alfalfa in İran and in Wisconsin (USA), associated with 'Candidatus Phytoplasma asteris'. Symptoms such as leaf stunting, yellowing and witches' broom were observed in alfalfa in Iran associated with phytoplasmas in the 16SrII-D group. Leaf yellowing and plant stunting were also associated with 16SrII-D group phytoplasmas infecting alfalfa in Sudan. This is thought to be the first report of a phytoplasma disease in alfalfa-growing areas in Turkey.