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date: 22 September 2020

halo spot 

A Dictionary of Ecology

Michael Allaby

A disease of barley and other cereals, caused by the fungus Septoria oxyspora (Selenophoma donacis). Lesions on upper leaves have pale centres with dark margins. The disease is important in only a few regions of Britain, including the wetter western regions of England, Wales, and Ireland.... ...

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