Link to the following Missouri Department of Conservation pages to learn more about the proper planting, pruning and general  care of trees.   

http://www.oznet.ksu.edu/library/plant2/l722.pdf                             Common diseases

http://www.mdc.mo.gov/documents/forest/urban/F00111.pdf       Mulching

http://www.mdc.mo.gov/conmag/2005/04/50.htm                          Planting/  Stem Girdling Roots

http://www.mdc.state.mo.us/documents/forest/pruning_guide.pdf        Proper Pruning

http://www.geocities.com/rocksandtrees/thestump/index.html                                                                   "The Stump" Newsletter from Dept. of Conservation Arborist, Jon Skinner

                                      More to come as available