Diaporthe citri
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Author(s): Cesar Calderon, USDA APHIS PPQ
Source: IPM Images
Diaporthe citri (H.S. Fawc.) F.A. Wolf 1926
This fungus is widely distributed in citrus-growing regions, causing melanose as well as stem-end rot of citrus. These disease may be also caused by other fungi like Diaporthe rudis. Melanose is the formation of dark, often raised spots on the leaves and the fruit surface. The fungus affects only the fruit surface and infected fruits can still be used for processing. However, they normally cannot be sold as fresh fruits.
D. citri infects mainly young leaves and fruits, but can also live as a saprophyte in dead twigs. Infections are promoted by moist conditions and the conidia spread by rain or overhead irrigation water. Different shaped conidia have been described, but alpha conidia are most common, and are typically 5-10 µm long with an oval to elliptical shape. The ascospores disperse by wind, and perithecia are usually formed in dead twigs.
Synonym:
Phomopsis citri
- Other images of Diaporthe citri (IPM Images - click to enlarge)
symptoms on citrus fruit
symptoms on citrus fruit
symptoms on citrus fruit
pycnidium
