Contact Us

Email us
Phone: +1.678.367.0981
Fax: +1.240.547.1795

Mailing Address

International Society of Arboriculture
PO Box 191
Annapolis Junction, MD 20701
United States

Physical Address

International Society of Arboriculture
270 Peachtree St NW, Suite 1900
Atlanta, GA 30303
United States

Order Delays Due to Physical Inventory

Due to ISA's annual physical inventory, orders placed between
2 p.m. EDT, Thursday, 20 June 2019, and 11:59 p.m. EDT, Friday 28 June 2019, will not ship until the week of 1 July 2019

Please plan your ordering accordingly.

We will resume regular turnaround times
1 July 2019.

Thank your for your patience.

Questions? Please call the customer service team at (678) 367-0981.

    Climbers' CornerTree Academy

    Organic pesticides: reviewing the science behind their efficacy


    Municipalities around the world are reducing or eliminating conventional pesticide use in their public greenspaces to decrease environmental pollution and protect human health. Pest management in these communities increasingly relies upon organic pesticides more favorably regarded by the public.  While these OMRI-certified pesticides may be regarded as safer than conventional products, their demonstrated efficacies range from highly effective to variable to ineffective. This seminar will summarize the published research behind some of the most widely used organic pesticides, with special mention of those materials with no definitive science behind their use.


    Dr. Linda Chalker-Scott has a Ph.D. in Horticulture from Oregon State University and is an ISA certified arborist.  Before her current position, she was a tenured associate professor at Buffalo State College and at the University of Washington. Linda is now the Extension Urban Horticulturist and an Associate Professor in the Department of Horticulture at Washington State University and maintains an affiliate associate professor status at University of Washington.  She is the author of three books: the award-winning, horticultural myth-busting The Informed Gardener and The Informed Gardener Blooms Again, and Sustainable Landscapes and Gardens: good science – practical application, a comprehensive approach to the science behind urban horticulture and arboriculture.  Two other books are in progress: How Plants Work – a gardener’s guide to plant physiology (Timber Press) and an update of Art Kruckeberg’s seminal work Gardening with Native Plants (University of Washington Press). She has published extensively in the scientific literature as well as in popular magazines such as American Nurseryman, Organic Gardening, and Fine Gardening. She and three other academic colleagues host “The Garden Professors” blog and Facebook page, through which they educate and entertain an international audience. 





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    Climbers' CornerTree Academy

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