Mid-Atlantic Chapter, International Society of Arboriculture - information and links on trees and their care (arboriculture); resources for arborists
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.
Arboricultural Information Exchange. - The AIE site (UK) has news, links and collections of resources for arboriculture.
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.
The California Arborists Association - Membership information, details and timetables of activities and workshops.
Wildtrees - Includes views on conservation of native trees for the environment.
ACRT Institute of Arboriculture and Urban Forestry - Training for the line clearing, tree care and urban forestry industry.
Great Southern Tree Conference - Educational event devoted to tree selection, landscape, production, marketing and management issues in the Southern United States.
Tree world - Discussion and information about trees with industry experts. Questions answered, participation for registered users.
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