Answer: It sounds as though your trees and shrubs are showing the signs of drought related damage. The curly foliage indicates the roots were dry when the foliage was forming. Now that you've got your watering systme up and running, the trees should recover and you should begin to see new growth. I suspect the affected leaves will remain for the season but next spring the foliage should emerge a lot healthier. Junipers can become drought stressed, too, but they aren't as forgiving as broadleaf trees. Anything that is dead on the juniper is not likely to sprout new growth. You'll have to decide if you want to replace them, or cut them back in the hopes that they will sprout new stems, branches and foliage.
The white you describe on the tree trunk that disappeared after you removed the weeds was probably a fungal growth due to moisture against the trunk. Now that it's getting good air circulation, the problem should take care of itself.
I hope your landscape recovers with minimal additional care.
Best wishes with your yard!
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