Alisma
Certified GKH Gardening Expert
Certified GKH Gardening Expert
Answered on November 29, 2016
I am not sure what these bumps are. They may be normal swellings called lenticels that can appear in wet weather. Or, they could be caused by nematodes:
https://smartsite.ucdavis.edu/access/content/user/00002950/courses/204NEM/IGALLS.htm
I don't think it is any more serious disease, like crown gall.
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