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International Society of Arboriculture
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Science of Arboriculture Podcasts

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On a calm June evening in 2017, a 22-inch diameter limb suddenly fell upon a person in a municipal park, causing severe harm. The limb was part of a locally significant, 90-foot tall, 125-year-old plains cottonwood that was climbed by school kids as part of Arbor Day celebrations only weeks before the limb failed. The tree was pruned 5 years before the incident, but could this failure have been predicted and avoided? Are arborist certifications, qualifications, and routine visual inspections enough to defend our actions against charges of breach of duty? In this presentation, Mike Garvey discusses these questions. Watch the ISA 2020 Virtual Conference Rewind Series videocast, and then take this accompanying CEU quiz to check your knowledge. (A, U, M, T, Bm)


0.5 CEU
ISA Members: $9.95
Retail Price: $11.95
All prices in US Dollars

In this presentation, Alessio Fini discusses an experiment that began in 2011 to evaluate the effects of different pavements on the growth and health of two urban tree species: Fraxinus ornus (Manna ash) and Celtis australis (European hackberry). Biometric and physiological measurements have been made since 2012. Listen to the Science of Arboriculture podcast and then take the accompanying CEU quiz to check your knowledge. (A, U, M, T, Bp)


0.5 CEU
ISA Members: $9.95
Retail Price: $11.95
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In this presentation, James Downer examines the post-apocalyptic zone in Pripyat, Ukraine and the survival of an extant population of horsechestnut trees. Comparisons are made between similar age populations in Kiev, Ukraine. Listen to the Science of Arboriculture podcast and then take the accompanying CEU quiz to check your knowledge. (A, U, M, T, Bs)


0.5 CEU
ISA Members: $9.95
Retail Price: $11.95
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In order to reach tree canopy goals, we must inspire everyone around us to plant and care for trees. This presentation by Jessica Sanders highlights trees on structures, as well as urban land conservation efforts that are ongoing in order to reach Washington DC’s 40% tree canopy goal. Watch the ISA 2020 Virtual Conference Rewind Series videocast, and then take this accompanying CEU quiz to check your knowledge. (A, U, M, T, Bm)


0.5 CEU
ISA Members: $9.95
Retail Price: $11.95
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Wire baskets helped to industrialize the transplanting process for field-grown nursery stock. However, their use is not without controversy, and while opinions abound, actual research on this topic is relatively scarce. Join Andrew Koeser as he discusses past and recent research findings in an effort to offer an impartial view on one of arboriculture’s more controversial issues regarding cultural practice. Listen to the Science of Arboriculture podcast and then take the accompanying CEU quiz to check your knowledge. (A, U, M, T, Bp)


0.5 CEU
ISA Members: $9.95
Retail Price: $11.95
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Many tree managers are conducting tree inventories to monitor urban trees, and one of the most important parameters being collected is information on the tree’s vitality, sometimes called condition. But what is tree vitality, how can it be rated, and how do different user groups rate it? Presenter Johan Östberg discusses a study that compared how arborists and biologists rate tree vitality and this information can be useful for managers and consultants. Watch the ISA 2020 Virtual Conference Rewind Series videocast, and then take this accompanying CEU quiz to check your knowledge. (A, U, M, T, Bm)


0.5 CEU
ISA Members: $9.95
Retail Price: $11.95
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In this month’s presentation, Dr. John Ball will cover some of the evolving research on climber performance, and how we can improve our climbing fitness and reduce fatigue. Watch the ISA 2020 Virtual Conference Rewind Series videocast, and then take this accompanying CEU quiz to check your knowledge. (A, U, M, T, L, Bp)


0.5 CEU
ISA Members: $9.95
Retail Price: $11.95
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Tree health and vitality influence a wide range of physiological processes including pest/disease susceptibility and water stress resilience. Dr. Banks will introduce the concept of tree vitality and how it can relate to pest and disease resilience, as well as tree establishment and survival within the landscape. Listen to the Science of Arboriculture podcast and then take the accompanying CEU quiz to check your knowledge. (A, U, T, M, Bp)


0.5 CEU
ISA Members: $9.95
Retail Price: $11.95
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Join Deb Hilbert, a University of Florida Ph.D. student in her research poster presentation of “Collaborating to Increase Urban Tree Diversity.” Watch the ISA 2020 Virtual Conference Rewind Series videocast, and then take this accompanying CEU quiz to check your knowledge. (A, U, M, T, Bp)


0.5 CEU
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Retail Price: $11.95
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This presentation by Dr. Ruark covers some of the current “state-of-the-art” tools and techniques used by urban foresters in determining nutrition sampling, risk assessment, and lab diagnostics for plant pathogens. Plus, a compiled list of mobile device apps currently used by diagnosticians. Listen to the Science of Arboriculture podcast and then take the accompanying CEU quiz to check your knowledge. (A, U, T, M, Bp)


0.5 CEU
ISA Members: $9.95
Retail Price: $11.95
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What happens when trees are grown in stormwater basins in dry summer climates?  What are the characteristics of artificial soils used in GSO facilities?  Watch Igor Lacan in the ISA Conference Rewind series to learn more from 5 years of his research and take the accompanying quiz to check your knowledge. (A, U, M, T, Bp)


0.5 CEU
ISA Members: $9.95
Retail Price: $11.95
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When planning new green spaces, it is necessary to remember that the urban environment is very different from the natural environment where the species evolved. Which trees native or exotic should be planted in order to maximize carbon sequestration and pollutants removal? Which species can better face the temperature increase foreseen for the next decades? Discover theses answers and more with Dr. Francesco Ferrini by listening to the Science of Arboriculture podcast and then taking this accompanying CEU quiz to check your knowledge. (A, U, M, T, Bp)


0.5 CEU
ISA Members: $9.95
Retail Price: $11.95
All prices in US Dollars
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