Cucumber leaves brown spots

Asked June 29, 2020, 9:07 AM EDT

Two leaves on my cucumber plant have this appearance, stems look health. Please help me identify this and make recommendations on stopping it before more plants are affected. Thank you!

Ramsey County Minnesota

1 Response

I think you have Alternaria leaf spot. Water from underneath, the frequent rains complicate this and promote fungal disease. Mulch under your plants and please see the fact sheet and compare with the plant. It gives control measures.
https://ag.umass.edu/vegetable/fact-sheets/cucurbits-leaf-spots