Celery

Question

I have 9 celery plants in my garden and have grown celery for years and they do well in my garden, but this year, I have 2 plants out of the nine that are in between others that the leaves are curling up and I am not sure what they need or are lacking or do you think it may just be something in the plant itself?? Those two also seem to have a little lighter color to them, not the bright green color the others carry. Please let me know any suggestions you may have.

Answer 1

They may have leaf spot. This article will help:
http://www.ipm.ucdavis.edu/PMG/r104100311.html