Ohia trees are dying rapidly, Why?

[Opihikaobob]

quote:

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Originally posted by Justin

Bob, they die from the top down because the trees lose the ability to "pump" water and nutrients up to the top of the tree, so the top dies first, and as the tree continues to lose energy the leaves lower on the tree start to go.

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Thank you Justin, "lose the ability to pump water up" meaning the problem starts at say the root level ,but the visible effects of the tree dying, start at the crown? Or is it that the dying of the crown results in the the loss of the ability to pump up water?