Here are some websites with lots of valuable information about tree care.  

www.isa-arbor.com

(International Society of Arboriculture)

www.TreesAreGood.org

www.americanforests.org

www.tcia.org

(Tree Care Industry Association)

www.arborday.org

www.aufa.com

(Alabama Urban Forestry Association)

Below we have provided third

party links to various tree health

informationals and problems.

Why Topping HURTS Trees:

http://www.treesaregood.org/

treecare/resources/

WhyToppingHurts.pdf

How to prune trees:

http://publications.usa.gov/

USAPubs.php

How to select trees for you

home:

http://urbanext.illinois.edu/

treeselector/

My oak tree is wilting:

http://www.na.fs.fed.us/

spfo/pubs/pestal/sodeast/

sodeast.htm

How to pick a winning plant:

http://www.usna.usda.gov/

Gardens/faqs/pickingplants.html

Mature Tree Care:

http://www.treesaregood.org/

treecare/resources/Mature

_TreeCare.pdf

Is my tree dangerous?

http://www.treesaregood.org/

treecare/resources/Tree%20Risk.pdf

What to do after a tree has

substained storm damage:

http://www.treesaregood.org/

treecare/resources/

StormBrochure_Preview_sm.p

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