Eucalyptus spp. and their hybrids are frequently cloned and mass planted across farmland tracts and commercial plantations in northern India. It is a viable feeder species to the paper and pulp industries in this region. In 2018 and 2019, during field surveys conducted in northern India, a serious leaf blight disease was frequently observed in E. tereticornis plantations. Isolation from the blighted leaf samples consistently yielded fungal isolates having Calonectria‐like morphology. Morphological features coupled with sequence analysis of partial β‐tubulin (TUB2) and partial translation elongation factor‐alpha (TEF1) gene regions of two fungal isolates confirmed the species as Ca. cerciana. In detached leaf assays and glasshouse inoculation experiments, both isolates produced symptoms similar to those observed on the naturally infected leaves. Koch's postulates were fulfilled by re‐isolating Ca. cerciana from the inoculated leaves. This work is the first to confirm that Ca. cerciana is associated with a serious leaf blight disease of Eucalyptus in northern India and is an important addition to the taxonomy of Calonectria fungi in India.

中文翻译：

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有关印度北部桉树叶片枯萎的Calonectria cerciana的首次报道

桉树属。它们的杂种经常在印度北部的农田和商业种植园中克隆和大量种植。它是该地区造纸和纸浆工业的可行饲养物种。在2018年和2019年，在印度北部进行的实地调查中，经常在大肠埃希氏菌人工林中观察到严重的叶枯病。从枯萎的叶样品中分离出的真菌分离株始终具有Calonectria样的形态。形态特征以及部分真菌分离物的部分β-微管蛋白（TUB2）和部分翻译延伸因子-α（TEF1）基因区域的序列分析证实该物种为Ca. cerciana。在分离的叶片测定和温室接种实验中，两种分离物产生的症状与在自然感染的叶片上观察到的症状相似。通过重新隔离Ca来满足Koch的假设。cerciana从接种的叶子。这项工作是第一个确认钙的方法。cerciana与印度北部桉树的严重叶枯病有关，是印度Calonectria真菌分类学的重要补充。