Septoria musiva

Septoria musiva, correct taxonomic name: Sphaerulina musiva (teleomorph: Mycosphaerella populorum), is an ascomycete fungus^[1] responsible of a leaf spot and canker disease on poplar trees. It is native on the eastern cottonwood poplar Populus deltoides, causing only a leaf spot symptom. On susceptible hybrid poplars, S. musiva causes necrotic lesions on the leaves which lead to premature defoliation, and cankers on the stem and branches which can reduce growth, predispose the tree to colonisation by secondary organisms, and cause stem breakage.

In 2013, Quaedvlieg et al. introduced a new combination for this species: Sphaerulina musiva (Peck) Quaedvlieg, Verkley & Crous,^[2] as they found that the type strains of both the genus Mycosphaerella (linked to the anamorph genus Ramularia via Ramularia endophylla) and the genus Septoria (linked to the anamorph genus Septoria, via Septoria cytisi) clustered separately from the clade containing Sphaerulina musiva.^[3]