Useful Web Links
Pruning Landscape Trees A great site on pruning from Dr. Ed Gilman, U. of Florida PA Community Forestry Shade tree information for municipal governments. Champion Trees of Pennsylvania The largest trees in Pennsylvania, listed by species and location. International Society of Arboriculture The primary research and certification organization for arborists.	Penn State Plant Pathology Fact Sheets Fact sheets on plant diseases of Pennsylvania.    Penn State Entomology Fact Sheets Fact sheets on insect pests of Pennsylvania.    The Pennsylvania Flora Project  Univ. of Pennsylvania project to document native plants.    Animated Knots by Grog Fun site to learn knot tying.