Science of Arboriculture

This presentation, led by Charles Cannon, will introduce the basic concepts of sap flow, the factors that influence it, and how it is measured, and then delve into collaborative research programs in long-term monitoring and experimental trials, ending with prospective uses of the data and technology. Listen to the Science of Arboriculture podcast and then take the accompanying CEU quiz to check your knowledge. (A, U, M, T, Bs)

Lignotuberous and epicormic buds are stress adaptations which can grow 4 m per annum and 300 mm per week using the capabilities of mature stem and root systems. Lignotuberous shoots are well-attached to root systems, but heavy, rapidly-growing epicormic shoots can fail. Both can be used to manipulate canopies. In a study conducted and discussed by Greg Moore, seedlings of Eucalyptus obliqua were heat stressed and decapitated in order to understand shoot production. In stressed trees, regeneration is from epicormic buds higher in the canopy, then lower branch epicormic buds, buds on the trunk, and finally lignotuberous buds, which are a last-resort survival mechanism. Understanding these shoots can be the difference between life and death for urban forest managers. Listen to the Science of Arboriculture podcast and then take the accompanying CEU quiz to check your knowledge. (A, U, M, T, Bs)

When trees are damaged during storms, they typically respond through the production of sprouting branches. Referred to as epicormic sprouts, these branches are a critical component in replacing the tree crown and photosynthetic capacity. Unfortunately, there is little empirical data to guide industry best management practices with respect to crown restoration pruning. In this presentation, Jake Miesbauer discusses results from a long-term study on the growth response of damaged trees to different pruning treatments and how these results can help guide practitioners to improve their methods for restoration of storm damaged trees. Listen to the Science of Arboriculture podcast and then take the accompanying CEU quiz to check your knowledge. (A, U, M, T, Bp)

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)

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)

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)

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)

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)

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)

What conditions give trees the best chances of living a healthy long life? What systems do trees use to defend against insects? Go in depth with Chadwick Award Winner Dan Herms by listening to the Science of Arboriculture podcast and then taking this accompanying CEU quiz to check your knowledge. (A, U, T, M, Bp)

What are the effects of pruning on mature trees? Linda Chalker-Scott presents the current state of science on the physiology of aging trees, which can be used to predict the impacts of conventional and retrenchment pruning on tree health. (A,M,T,L,Bs)

What are the effects of pruning on mature trees? Linda Chalker-Scott presents the current state of science on the physiology of aging trees, which can be used to predict the impacts of conventional and retrenchment pruning on tree health. (A,M,T,L,Bs)

Taking care of an urban forest doesn't mean you don't have to deal with wildlife, and whether it's protected species, or just ecological common sense, knowing how to retain wildlife will benefit the environment, and everyone in it. (A,T,L,Bp)

Taking care of an urban forest doesn’t mean you don’t have to deal with wildlife, and whether it’s protected species, or just ecological common sense, knowing how to retain wildlife will benefit the environment, and everyone in it. (A,U,M,T,L,Bsmp)

Falls are a constant danger for arborists working at height, and understanding the limitations and differences between fall protection, fall arrest, and fall restraint systems can be the difference in going home safe, or taking a trip to the hospital. Ed Carpenter explains in this month’s Science of Arboriculture. (A,M,T,L,Bm)

Falls are a constant danger for arborists working at height, and understanding the limitations and differences between fall protection, fall arrest, and fall restraint systems can be the difference in going home safe, or taking a trip to the hospital. Ed Carpenter explains in this month's Science of Arboriculture.(A,M,T,L,Bm)

Using a tree inventory to list the species, health, age, and maintenance needs of a specific tree is easy, but when you’re dealing with an urban forest of thousands of trees, that’s where the science of Geomatics map making comes into play. (A,M,Bs)

Using a tree inventory to list the species, health, age, and maintenance needs of a specific tree is easy, but when you're dealing with an urban forest of thousands of trees, that's where the science of Geomatics map making comes into play.(A,M,Bs)

As arborists it is easy to forget not everyone loves trees, in fact some people claim to hate them. In this episode of Science of Arboriculture, Francessco Ferrini examines the public misconceptions that can lead to this short sited view. (A,M,Bm)

As arborist it's easy to forget not everyone loves trees, in fact some people claim to hate them. In this episode of Science of Arboriculture, Francessco Ferrini examines the public misconceptions that can lead to this short sited view.(A,M,Bm)

A small dedicated group of researchers, tree climbers, and photographers set out to capture a singular image from the Waipuoua forest; a complete unobstructed picture of a full grown forest conifer. Their efforts became the New Zealand Tree Project, compositing the final picture from thousands of individual shots, and producing a documentary video of this towering project. (A,M,Bm)

A small dedicated group of researchers, tree climbers, and photographers set out to capture a singular image from the Waipuoua forest; a complete unobstructed picture of a full grown forest conifer. Their efforts became the New Zealand Tree Project, compositing the final picture from thousands of individual shots, and producing a documentary video of this towering project.(A,M,Bm)

Species diversity is an urban forest is vital to surviving a disease threat. In this month’s Science of Arboriculture, we look at the efforts in Sweden to learn from painful lessons and create a cooperative template between arborists, municipalities, and universities in promoting species diversity. (A, M, Bp)

Species diversity is an urban forest is vital to surviving a disease threat. In this month's Science of Arboriculture, we look at the efforts in Sweden to learn from painful lessons and create a cooperative template between arborists, municipalities, and universities in promoting species diversity.(A, M, Bp)

In 2012 an ambitious project brought together arborists, municipal managers, and university researchers from three different countries to help establish standards for the young and growing arboricultural practice in the Baltic Sea region. Lina Juisoo explains the challenges and successes of Project Green Man (A,M,Bm)

In 2012 an ambitious project brought together arborists, municipal managers, and university researchers from three different countries to help establish standards for the young and growing arboricultural practice in the Baltic Sea region. Lina Juisoo explains the challenges and successes of Project Green Man (A,M,Bm)

Ever more detailed and complex tree inventories provide a wealth of information to urban forest managers, and can help identify potentially unsound trees before they fail. But just how much of that information should be made available to the general public? Is there a down-side to flagging potential risks? Jaroslav Kolarik reports on a program in the Czech Republic. (A,M,Bm)

Ever more detailed and complex tree inventories provide a wealth of information to urban forest managers, and can help identify potentially unsound trees before they fail. But just how much of that information should be made available to the general public? Is there a down-side to flagging potential risks? Jaroslav Kolarik reports on a program in the Czech Republic. (A,M,Bm)

The destructive potential of a medium to large falling branch is commonly acknowledged by arborists, but just how much force can a me branch deliver to a target? John Goodfellow recaps a study for the utility industry attempting to answer that question in this month’s episode of Science of Arboriculture (Original presentation by John Goodfellow) (A,U,M,T,L,Bs)

The destructive potential of a medium to large falling branch is commonly acknowledged by arborists, but just how much force can a me branch deliver to a target? John Goodfellow recaps a study for the utility industry attempting to answer that question in this month's episode of Science of Arboriculture (Original presentation by John Goodfellow)(A,U,M,T,L,Bs)

A three day freeze with temperatures well below zero decimated the urban forests of Chihuahua Mexico, leaving the city with tens of thousands of dead trees to remove and replace. Carlos Van Der Menden reports on the recovery efforts. (A,M,Bm)

A three day freeze with temperatures well below zero decimated the urban forests of Chihuahua Mexico, leaving the city with tens of thousands of dead trees to remove and replace. Carlos Van Der Menden reports on the recovery efforts. (A,M,Bm)

The U.S. state of Florida covers thousands of square miles with climates ranging from temperate to tropical, Jason Smith, who specializes in emerging threats, takes a look at tree health issues in Florida, and beyond. (A,M,Bs)

The U.S. state of Florida covers thousands of square miles with climates ranging from temperate to tropical, Jason Smith, who specializes in emerging threats, takes a look at tree health issues in Florida, and beyond.(A,M,Bs)

Vegetation management under and around powerlines is a never ending struggle, but with today’s Satellite imagery and GIS, along with status reports from ground crews, near real time workload planning and cost forecasting is possible. Barry, Grubb of Florida Power and Light, and Chris Kelly of Clearion Software report on advances in this technology (A,U,M,Bm)

Vegetation management under and around powerlines is a never ending struggle, but with today's Satellite imagery and GIS, along with status reports from ground crews, near real time workload planning and cost forecasting is possible. Barry, Grubb of Florida Power and Light, and Chris Kelly of Clearion Software report on advances in this technology (A,UM,Bm)

Every tree care business has its own unique set of capabilities, customer expectations, and pest management philosophies. Joe Boggs, assistant professor with Ohio State University Extension and department of entomology examines a common sense approach in maximizing pest management strategies. (A,U,M,T,L,Bm)

Every tree care business has its own unique set of capabilities, customer expectations, and pest management philosophies. Joe Boggs, assistant professor with Ohio State University Extension and department of entomology examines a common sense approach in maximizing pest management strategies.(A,U,M,T,L,Bm)

Ecological and financial benefits of tree planting projects can be quantified through long and short term studies, but what about the social outcomes for the communities of people involved, and the neighborhoods they live in? Jess Vogt and Shannon Watkins report on a five city study of neighborhood and non-profit urban forestry projects. (A,U,M,T,L,Bm)

Ecological and financial benefits of tree planting projects can be quantified through long and short term studies, but what about the social outcomes for the communities of people involved, and the neighborhoods they live in? Jess Vogt and Shannon Watkins report on a five city study of neighborhood and non-profit urban forestry projects. (A,U,M,T,L,Bm)

Trees and greenscapes provide a wealth of physical health benefits; cleaner air, shade and resulting lower temperatures, but what about physiological benefits? Dr. Ellen Vincent reports on a fascinating study targeting patient pain levels when provided with views of nature. (A,Bm)

Trees and greenscapes provide a wealth of physical health benefits; cleaner air, shade and resulting lower temperatures, but what about physiological benefits? Dr. Ellen Vincent reports on a fascinating study targeting patient pain levels when provided with views of nature. (A,Bm)

Individuals and companies place a high priority on safety, as do government regulators, and over the years that’s driven training standards. Keith Norton and Bob Urban examine the history of training standards and industry safety playing a perpetual game of catch-up in this month’s edition of Science of Arboriculture. (A,U,M,T,L,Bm)

Individuals and companies place a high priority on safety, as do government regulators, and over the years that's driven training standards. Keith Norton and Bob Urban examine the history of training standards and industry safety playing a perpetual game of catch-up in this month's edition of Science of Arboriculture. (A,U,M,T,L,Bm)

Look! Up in the sky! It’s a bird, it’s a plane, it’s an arborist with a drone! With the flood of unmanned aerial vehicles entering the commercial market, UAVs are already being put to use in agricultural, and arboricultural settings. From surveying and inspection, to pin-point spraying, Dan Staley and Alex Bilous takes a look at current and future use of drones in the green industry. (A,U,M,Bp)

Look! Up in the sky! It's a bird, it's a plane, it's an arborist with a drone! With the flood of unmanned aerial vehicles entering the commercial market, UAVs are already being put to use in agricultural, and arboricultural settings. From surveying and inspection, to pin-point spraying, Dan Staley and Alex Bilous takes a look at current and future use of drones in the green industry. (A,U,M,Bp)

Managing trees around utility power lines is a balance between maintaining a healthy forest, and guaranteeing uninterrupted power. Sara Sankowhich, system arborist with Unitil reports on a three year program that keeps the lights on, keeps utility customer’s happy, and maintains a thriving forest scape along right of ways. (A,U,M,Bm)

Managing trees around utility power lines is a balance between maintaining a healthy forest, and guaranteeing uninterrupted power. Sara Sankowhich, system arborist with Unitil reports on a three year program that keeps the lights on, keeps utility customer's happy, and maintains a thriving forest scape along right of ways. (A,U,M,Bm)

The struggles against the Asian Long Horned Beetle, and Emerald Ash Borer are just the latest battles against a history of imported pests. But as Joe Boggs explains, the challenge of dealing with non-native pests flows both ways between countries, and sharing information is the best weapon in turning the tide. (A,M,Bm)

The struggles against the Asian Long Horned Beetle, and Emerald Ash Borer are just the latest battles against a history of imported pests. But as Joe Boggs explains, the challenge of dealing with non-native pests flows both ways between countries, and sharing information is the best weapon in turning the tide. (A,M,Bm)

Are the world’s urban forests losing their big trees? Is there an ideal distribution of tree size in an urban forest? Justin Morgenroth of the New Zealand School of Forestry looks at ten years of data and compares guidelines for urban forestry management in this edition of Science of Arboriculture (A,M,Bm)