Garden of Disease

I need help identifying the problems here... I think I have a variety of blight and I need to know what I need to do asap. Thanks.

Apple:



Basil:







Bean:



Potatoes:





Squash:

(stem is flat and splitting)



I also had lettuce that looked like this (not my picture):



Should I pull out the entire root system? I harvested a few bucket fulls then it grew back covered in tiny white specks and brown spots along with the same damage under the leaves. Right now I have them cut all the way down...