Arborist Site Discussion Group - A loose affiliation of volunteer tree working professionals that discuss the needs of tree care within the industry and answer questions for the general public.
National Arborist Association - The trade association of commercial tree care businesses. Site has information (for consumers and for professionals) and links on tree care practices and standards.
Shigo on Tree Systems - A set of articles by Dr. Shigo on arboriculture, and on the growth of garden trees.
Arboricultural Association - Promotes care and knowledge of trees in the UK. Details of activities, members, and journal.
European Arboricultural Council - A forum for arboricultural organizations in Europe to liaise on research and education in tree establishment and improvement of working practices.
Bag Snaggers - A tool for arborists and urban tree pruners for removing plastic bags and other debris from trees.
International Society of Arboriculture - Arboriculture On-line was developed to assist tree care professionals in developing and maintaining effective plant health care programs. Includes an extensive collection of urban forestry links.
