Symptoms of partially bleached and completely white heads were observed in a triticale (× Triticosecale) cultivar ‘BARI Triticale 1ʹ in the research plots at the Regional Agricultural Research Station, Jashore, Bangladesh, during April 2019. Foliar symptoms with elliptical or eye-shaped lesions were also found on plant leaves. The main intention of this study was to isolate and identify the causal organism of the disease. Morphological characteristics of the pathogen showed the presence of pyriform 2-septate hyaline conidia and coloured conidiophores, indicating the presence of the fungus Magnaporthe oryzae. Molecular analyses by ITS sequence analysis and amplification of the product with MoT3 primers confirmed the identity of the fungus as M. oryzae pathotype Triticum. The pathogenicity of the representative isolates was confirmed by inoculation of triticale heads and leaves under laboratory conditions, resulting in similar symptoms as observed in the field. To our knowledge, this is the first report of triticale blast caused by M. oryzae pathotype Triticum in Bangladesh.

在2019年4月于孟加拉国Jashore的区域农业研究站的研究小区中的黑小麦（× Triticosecale）品种'BARI Triticale 1 '中观察到部分漂白和完全白头的症状。叶形症状有椭圆形或眼形病变也被发现在植物的叶子上。这项研究的主要目的是分离和鉴定疾病的病原体。病原体的形态学特征表明，存在pyri-2-septate透明膜分生孢子和有色分生孢子，表明存在稻瘟病菌（Magnaporthe oryzae）。通过ITS序列分析进行分子分析，并用MoT3引物扩增产物，证实该真菌为米曲霉。致病类型小麦。通过在实验室条件下接种黑小麦头和叶确认了代表性分离株的致病性，导致了与现场观察到的相似症状。据我们所知，这是孟加拉国由米曲霉致病型小麦引起的黑小麦爆炸的首次报道。