Yellow spots on cucumber leaves - can anyone identify? (Pictures)
My cucumbers first started showing large yellow spots on the leaves, now the center of those spots are turning brown. I've included several pictures. I've been researching downy mildew and powdery mildew but not sure what it is, if it is even one of those two. Also looking for a natural way to treat it - should I use copper soap fungicide or something like that?? Thanks for any help!!!