Disease on chard - Ask Extension
Hello,
We live in west Eugene, and we'd like help identifying the disease/mildew that has been affecting our chard this year. Chard was grown from se...
Knowledgebase
Disease on chard #889917
Asked November 16, 2024, 11:28 AM EST
Hello,
We live in west Eugene, and we'd like help identifying the disease/mildew that has been affecting our chard this year. Chard was grown from seeds from Territorial purchased in 2023. Photos attached and taken last week (Nov 11 2024). Is there a solution for
this issue?
Thank you for your help.
Lane County Oregon
Expert Response
Most likely downy mildew https://pnwhandbooks.org/plantdisease/host-disease/swiss-chard-beta-vulgaris-subsp-cicla-downy-mildew
but could be Cercospora leaf spot, caused by the fungus Cercospora beticola, occurs wherever table beets, swiss chard, sugar beet, and spinach are grown and is one of the most important diseases affecting the Chenopodium group. It can result in significant losses, particularly in late summer when conditions are favorable (high temperatures, high humidity, long leaf wetness periods at night). Leafy greens become unmarketable, and beet roots fail to grow to full size when disease is severe. https://ag.umass.edu/vegetable/fact-sheets/cercospora-leaf-spot-of-swiss-chard-beets-spinach
but could be Cercospora leaf spot, caused by the fungus Cercospora beticola, occurs wherever table beets, swiss chard, sugar beet, and spinach are grown and is one of the most important diseases affecting the Chenopodium group. It can result in significant losses, particularly in late summer when conditions are favorable (high temperatures, high humidity, long leaf wetness periods at night). Leafy greens become unmarketable, and beet roots fail to grow to full size when disease is severe. https://ag.umass.edu/vegetable/fact-sheets/cercospora-leaf-spot-of-swiss-chard-beets-spinach
