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Diaporthe Nitschke 1870
The genus has a world-wide distribution and contains important plant pathogenic species. Other forms may be endophytes, saprobes or human pathogens. On crops a number of species cause diseases like root rot, dieback, cankers, leaf spots, blights, decay or wilt. Stored fruits may be also affected.
The asexual forms have been described under the genus Phomopsis. The sexual stage is characterized, among others, by immersed ascomata, unitunicate asci as well as hyaline and 1-septate ascospores. The asexual stage has ostiolate conidiomata (pycnidia), producing up to 3 types of hyaline and aseptate conidia.
Previously, morphological characters and the host range of the species have been used for identification, but this has been replaced by using DNA sequences. For example, sequences for the complete nuclear ribosomal internal transcribed spacer regions (ITS) and/or partial sequences of actin, ß-tubulin, calmodulin, histone H3, mating type genes as well as the translation elongation factor 1-alpha are being used.
Economically, the most important crop pathogens include:
- Diaporthe ampelina - causing dead-arm disease on grapevine
- Diaporthe helianthi - causing stem canker on sunflower
- Diaporthe phaseolorum - causing several soybean diseases
- Diaporthe sojae - causing stem blight and other soybean diseases
For other species see the list below. For species infecting weeds see Diaporthe (weed pathogens).
Type species: Diaporthe eres
For a taxonomic review see Gomes et al. 2013.
The following species are currently entered under Diaporthe (genus):