As the growing season progresses, I'm starting to discover more pests and plant diseases that I've only been reading about until now. Can someone tell me if this is powdery mildew on my squash leaves, or something else? There are numerous white spots spread all over the leaves. Also, the whole plant has been getting more yellow-green the last week or two.
(click on all pictures to enlarge and see the spots better)
And what about these white spots on my cucumber leaves? They look very different from the white spots on the squash leaves. Does anyone know what this is?
And lastly, there are holes on my bean leaves. I thought the culprit was japanese beetles, but I found a different pest today. Yellow striped armyworm, I think?