My parents have a couple that dropped all their needles (which turned brown first)... I think it's the intensity of the heat and drought down here this past summer. We fertilized, mulched, and watered them, and now they've put out new needles. Your trees might still have a chance if you give them some help (see the sick tree treatment).
Definitely spray down the trunks often with water+Garrett Juice. Could also add Medina plus, seaweed, fish, Superthrive etc. But do it as often as you can if they're really hurting.
Also, the Alpha Bio Systems Thrive that has come out recently could really help them to more efficiently utilize available water through the roots. We've been using that stuff lately and it's pretty impressive.
Good luck!
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