Plant Issues

[Erin]

It's nearing the end of the main gardening season for me, but I was hoping someone might be able to tell me what's wrong with some of my plants and how to prevent it next year.
I already had aphids on the tomatoes, but now something else is happening. I think the tomatoes/peppers might have early blight, not sure about the cucumbers and sweet potatoes, the squashes appear to have powdery mildew. It'd be nice to know what's happening, but I'm much more focused on stopping this from happening again next year. Also, I have a tiny kiwi plant I got years back as a sprout, and it keeps producing leaves in the spring and then appearing to die but returning. It's currently in a pot, am I under/over watering it, or is there some other problem? Any recommendations on any of these would be greatly appreciated!

Cucumbers:

Tomatoes:

Squash (butternut and spaghetti):

Pepper:

Sweet potatoes (holes in leaves):

 

[Meerkat]

I'll bumb it up for you Erin because I don't know if it is in the soil or insect related,one is powdery ildew and one looks liek rust but I don't see to well but know others here can help you with this.

 

[Erin]

Thank you very much!

 

[Patchouli]

I can't say what your plants' problems are either but if you're in the U.S. your agricultural extension office could probably help you to find out what it is and good solutions for better luck next growing season.