A. yali-inficiens is a dark-brown to black mould causing dark ('chocolate') brown spots on Ya Li pear (Pyrus bretschneideri) fruit from China.
Other unidentified species of Alternaria cause diseases on Ya Li pear (Pyrus bretschneideri) fruit from China, and diseases could be due to infection by more than one species at a time. Infections were sometimes observed on fruit stems before they progressed to the body of the fruit (Roberts, 2005). If the symptoms described in this datasheet are observed, prompt and correct identification requires microscopic observation of conidiophores and conidia produced on the fruit and in pure culture under prescribed conditions (Simmons, 2007).
Related invasive species
- Alternaria yali-inficiens
Related Farm Practice
- Groups
A. yali-inficiens is an asexually reproducing, filamentous fungus known only since its isolation in 2001 from infections on fruit of Ya Li pears (Pyrus bretschneideri), exported from a certain region of China. Although most species of Alternaria are air-disseminated, its ability to spread and establish in other temperate fruit-growing regions is not known. This fungus may pose a threat to native or agricultural plants if introduced. Some countries importing pear fruit from China have established regulatory precautions against it.
Sunken, dark-red to chocolate-brown lesions on fruit with concentric zones, sometimes obscured by sporulation, and even to irregular margins, often appearing at the stem end. Sporulation develops as clusters of whisker-like growth from groups of dark, subsurface cells, the clusters enlarging and merging to produce a dark velvety appearance. Lesions on the stems are sunken, shiny, and dark-brown to black (Roberts, 2005).