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Parsnip canker

Parsnip canker is caused by a fungus and this fungus is also responsible for the silver-gray spots in members of the umbellifers family.

recognize parsnip canker
Parsnip canker, photo: Lauren Chappell, University of Warwick

Parsnip canker is caused by the fungus Itersonilia pastinacae. This fungus causes cancer in members of the umbellifers family (Apiaceae or Umbelliferae) and is also responsible for the silver-gray spots. The black or orange spots on the roots are a sign of Parsnip canker. The spots usually occur at the top of the roots. Sometimes the roots rot away. The spots are not so much black, but rather purple.
The fungi survive in the soil and multiply if Parsnip crops are often grown in the same area. Poorly draining soil and a low pH increase the risk of infestation.

Where to find

Control

Remove infested plants, leave open area fallow.

Prevention

Crop rotation helps prevent Intersonilia.
Do not sow or plant other tuberous plants on the spot where infested parsnips have stood.