Asian pears. I have 3 trees and each produces a couple hundred pounds of pears. No fungal diseases, can be protected from insects by spraying a kaolin clay solution on it.
Santa Rosa plums. I had fungal diseases on the first ones, but for some reason the later ones came through OK. They start green, turn red, then purple. Purple ones are ripe. There would have been a hundred pounds of plums or so per tree had I not lost a large percentage (but not all!) to fungal brown rot. In a more dry climate, the fungal disease would not be nearly as much of a problem, so long as you can water it at the roots. The fungal diseases are from the moisture in the air and frequent rainfall (which is good in other ways).
So if you can find a way to get water, farming in the desert has it’s advantages. If you are in a moist place, you need to grow stuff that is resistant to fungal diseases. The Irish potato famine was a fungus, phytopthora.
String beans growing next to potatoes. Not much problem with string beans. String beans, the bush and half runners, grow well crowded together, in a row 2 feet wide. I actually like bush and half runners better than pole beans. they produce very well this way.
These are my henley cardboard potato towers posted again. Harvest time will also be posted.