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| The California Tree Failure Report Program (CTFRP) was established in 1987 to collect quantitative information on the mechanical failure of urban trees (trunk breaks, branch breaks, and uprootings). This information is used to develop "failure profiles" for genera and species to more accurately assess failure probability in standing trees and thereby reduce failure potential in urban forests. |
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| The Western Chapter of the International Society of Arboriculture was formed in 1934. It is a nonprofit corporation comprised of 2500 persons in Arizona, California, Hawaii and Nevada engaged or interested in the practice of arboriculture. |
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| The International Society of Arboriculture On-Line mission states: Through research, technology, and education promote the professional practice of arboriculture and foster a greater public awareness of the benefits of trees. |
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| American Forest mission: We help people improve the environment with trees and forests. We plant trees. American Forests is a world leader in planting trees for environmental restoration, a pioneer in the science and practice of urban forestry, and a primary communicator of the benefits of trees and forests. |
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| National Arborday Foundation mission: We help people plant and care for trees and encourage the celebration of Arbor Day to advance global environmental stewardship for the benefit of this and future generations. |
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| The National Arborist Association is the trade association of commercial tree care businesses. |
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