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History of ISA: 1920s


The organization began as a marriage of convenience between progressive commercial arborists and scientists whose research concerned trees. Although tree care had been practiced by commercial companies and individuals for years, the industry was largely unregulated and uninformed. As for the scientists, their knowledge of amenity trees and tree care was somewhat limited. There were many demanding questions in horticulture, forestry, entomology, and pathology concerning trees—issues that required research for answers.

The Shade Tree Conference (STC) first met in 1924, in Stamford, Connecticut. W.E. Britton, along with Francis A. Bartlett, president of The F.A. Bartlett Tree Expert Company in Stamford, were the two principal figures in organizing the conference. At the invitation of Bartlett, some of the meetings were held on his experimental farm north of Stamford. The conference opened with about 36 participants from seven states and Washington, D.C.

Bartlett established a conference format combining paper presentations with field demonstrations and trials. This precedent became a regular practice for later conferences. Presentations were made on a variety of topics including gypsy moth control, tree surgery, and wound healing, and were limited to five minutes each. A significant aspect of this conference is that it united the Davey Tree Expert Company, The F.A. Bartlett Tree Expert Company, and several smaller commercial firms in the pursuit of a common goal.

At the fourth conference, held in Washington, D.C., the most significant event was the endorsement of the articles of organization recommended by a committee appointed at the 1926 conference. This action created the National Shade Tree Conference (NSTC), marking the formal beginning of a new era in the history of arboriculture. An interesting footnote to the early structure is that commercial arborists were ineligible to hold office but were solely responsible for financing the conferences.


Cavity filling was an important part of tree work in the 1920s and 1930s.

The first appointed committee of the National Shade Tree Conference was the publications committee, whose mission was to prepare a set of meeting proceedings. Accordingly, its first publication was the Annual Proceedings of the 1929 Conference in Brooklyn, New York.

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