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Many tree problems are associated with the following:

Troubles in the Rhizosphere
http://www.treedictionary.com/DICT2003/shigo/RHIZO.html

Unhealthy Trees from the Nursery / Improper Planting
http://home.ccil.org/~treeman/sub1.html and
Look up "Tree Planting"
http://www.treedictionary.com/DICT2003/shigo/RHIZO.html

Improper Mulching - http://home.ccil.org/~treeman/sub3.html and
http://www.treedictionary.com/DICT2003/M/index.html Look up "Mulch"

Improper Pruning
http://www.treedictionary.com/DICT2003/tree_pruning/

Improper Fertilization (See A Touch of Chemistry)
http://www.treedictionary.com/DICT2003/shigo/CHEM.html

Sincerely,
John A. Keslick, Jr.
Arborist
http://home.ccil.org/~treeman
and www.treedictionary.com
Beware of so-called tree experts who do not understand tree biology.
Storms, fires, floods, earthquakes, and volcanic eruptions keep reminding us
that we are not the boss.

"The Space Boss" wrote in message
oups.com...
I just had some cypress trees dry out and die on my property. I was
told it was a root fungus, but who knows, because two other arborists
told me something completely different.

But I got to thinking, these particular trees I once had to water by
hand since the sprinklers weren't working for a while. And when I was
watering them, it wasn't just at the base, I was also spraying water
up into the tree itself, into the bark, etc.

Could it be that this somehow washed away a protective coating or
something that caused them to die?