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)

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)

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)

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)

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)