Knowledgebase
Diseases of Spinach #834292
Asked June 07, 2023, 11:03 AM EDT
Durham County North Carolina
Expert Response
This looks like a leaf spot disease, possibly Stemphylium leaf spot. This problem shows up in Spring and when there is high humidity. Sometimes the pathogen can come with the seeds.
You should remove all affected plants and for the next two years at least plant in a different area.
We would also recommend you have your soil tested because the pH of the soil is important for spinach which does not like acid soil. In North Carolina soil testing is free between April 1 and Thanksgiving.
If there are small holes in the leaves and you notice small black beetles, these beetles can sometimes feed on spinach leaves.
A good article with photographs can be found here:
Debby
Durham County Extension Master Gardener Volunteer
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Glad to help