19 days ago

Spinach plants yellow with spots

what do you think is going on with these spinach plants - I live in New England it has been around 50 degrees and kind of wet for May

Boston, Massachusetts
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1 answer

I think it could be Cladosporium leaf spot or anthracnose disease (excluding Stemphylium Leaf Spot from the list because generally we won't see the green/black mycelium and sporulations on the spots).
Both are fungal diseases. The Cladosporium appears as round, tan color spots with dark green spores and mycelium in the center of these spots. Whereas anthracnose disease shows small, circular, water‑soaked lesions which later turn brown to tan and appear papery. These spots exhibit heavy growth of tiny black fruiting bodies.
Microscopic observation of spores will help in identifying the exact pathogen.

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