First report of leaf blight caused by Alternaria longipes on oat in Turkey.
In May 2016, ovoid spots, brown in colour with yellow halos were observed on leaves of oat (Avena sativa) in 2 fields in the Foça and Menemen districts of Izmir, Turkey. These spots were initially on the lower leaves and then progressed to the upper leaves. Later, the spots coalesced and appeared as blights covering the leaf surface including the sheath. The same symptoms were also observed on oat in both the original and new locations (Balikesir and Edirne) in 2017 and 2019. Disease incidence and severity ranged from 50-80 and 3-50%, respectively. The causal pathogen was isolated and identified as Alternaria longipes based on morphological, molecular and pathogenicity analyses. Sequences of the PCR product for the isolate were deposited in GenBank with the accession number MN067804. This is thought to be the first report of A. longipes causing leaf blight on oat in Turkey.