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Didymella pinodes  is the principal causal agent of ascochyta blight, one of the most important fungal diseases of pea ( Pisum sativum ) worldwide. Understanding its host specificity has crucial implications in epidemiology and management; however, this has not been clearly delineated yet. In this study we attempt to clarify the host range of  D. pinodes  and to compare it with that of other close  Didymella  spp.  D. pinodes  was very virulent on pea accessions, although differences in virulence were identified among isolates. On the contrary, studied isolates of  D. fabae, D. rabiei , and  D. lentil  showed a reduced ability to infect pea not causing macroscopically visible symptoms on any of the pea accessions tested.  D. pinodes  isolates were also infective to some extend on almost all species tested including species such as  Hedysarum coronarium, Lathyrus sativus, Lupinus albus, Medicago  spp.,  Trifolium  spp.,  Trigonella foenum-graecum , and  Vicia articulata  which were not mentioned before as hosts of  D. pinodes . On the contrary,  D. lentil  and  D. rabiei  were more specific, infecting only lentil and chickpea, respectively.  D. fabae  was intermediate, infecting mainly faba bean, but also slightly other species such as  Glycine max, Phaseolus vulgaris, Trifolium  spp.,  Vicia sativa , and  V. articulata . DNA sequence analysis of the nuclear ribosomal internal transcribed spacer region (ITS) was performed to confirm identity of the isolates studies and to determine phylogenetic relationship among the  Didymella  species, revealing the presence of two clearly distinct clades. Clade one was represented by two supported subclusters including  D. fabae  isolates as well as  D. rabiei  with  D. lentil  isolates. Clade two was the largest and included all the  D. pinodes  isolates as well as  Phoma medicaginis  var.  pinodella . Genetic distance between  D. pinodes  and the other  Didymella  spp. isolates was not correlated with overall differences in pathogenicity. Based on evidences presented here,  D. pinodes  is not specialized on pea and its host range is larger than that of  D. fabae, D. lentil , and  D. rabiei . This has relevant implications in epidemiology and control as these species might act as alternative hosts for  D. pinodes .

Clarification on Host Range of Didymella pinodes the Causal Agent of Pea Ascochyta Blight