Botrytis squamosa
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Author(s): Lindsey du Toit (Washington State University)
Source: IPM Images
Botrytis squamosa J.C. Walker 1925
This fungus is widely distributed and causes leaf blight of onions. Symptoms start as small white lesions on the leaves surrounded by a greenish halo. These expand and become straw-coloured spots. In a second stage, the leaves become blighted. The disease results in smaller bulbs and yield losses of up to 30%.
The fungus overwinters as sclerotia on plant debris. These can survive for about 2 years. They typically germinate in spring and the fungus forms conidia that infect the new crop.
Synonyms:
Botryotinia squamosa
For details see the respective page in Wikipedia.
- Other images of Botrytis squamosa (IPM Images and PaDIL - click to enlarge)
leaf symptoms (lesions appear as small, sunken, light tan areas surrounded by pale green tissue)
concertina-like collapse of conidiophore branches
