PNW Tree Profiles September 2017 Updates

In place of a tree profile this quarter, I’ve compiled an update of what we have observed about the performance of different species. Over 60 trees have been reviewed here and we have learned a lot of helpful information for tree selection and management. Remember, these are my observations, limited to these specific trees grown in western Washington. Your conditions and results may vary. Consider: Read More "PNW Tree Profiles September 2017 Updates"

New Technical Report: Polypores of British Columbia

Ginns, J. 2017. Polypores of British Columbia. Province of BC, Victoria, BC. Tech. Rep. 104. 

For arborists and urban foresters wanting to know more about tree diseases, this new publication is a useful addition for identification. It provides a comprehensive review of diseases, latest nomenclature, and how to identify them. It will be a useful addition to anyone wanting to learn more about tree diseases. Read More "New Technical Report: Polypores of British Columbia"

A Handbook of the World’s Conifers: Revised and Updated Edition

Farjon, A. 2017. A Handbook of the World’s Conifers (2 volumes). Revised and Updated Edition. Leiden, Netherlands: Koninklijke Brill NV. ISBN: 9789004324428

It is not often that a book about coniferous trees covers the entire collection worldwide. Most books are highly selective and omit the rarer, less known, or esoteric species. In the two volumes now available, Aljos Farjon has assembled in-depth coverage of all 615 species of conifers. Read More "A Handbook of the World’s Conifers: Revised and Updated Edition"

Essential Pruning Techniques: Trees – Shrubs – Conifers

Brown, G.E., and T. Kirkham. 2017. Essential Pruning Techniques. Trees. Shrubs. Conifers. Portland: Timber Press. pp.404.

This is an update and revision of the classic work by George Brown first published in 1972. The new book has been expanded, updated, and beautifully illustrated by Tony Kirkham, Head of the Arboretum and Gardens at Kew, in London. Read More "Essential Pruning Techniques: Trees – Shrubs – Conifers"

Review of Urban Tree Management for Sustainable Development of Green Cities

Every so often new books come out that provide a fresh perspective on well established themes. This latest offering by Wiley is one such example. All of the fifteen contributors are based in Germany, and the source material offered is very much European – a good thing as it introduces perspectives, examples, and case studies less commonly seen in North America.

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Book: The CODIT Principle. Implications for Best Practices.

It is a while since there has been a new book about CODIT. The CODIT Principle. Implications for Best Practices provides a welcome update and draws together old and new. It was originally published in Germany in 2008, and this translation brings a lot of useful material to a wider audience.

The seven chapters cover Introduction, The Basics of Tree Biology, The Wound Reactions of Trees, CODIT: From Model to Principle, The CODIT Principle – Considerations and Implications for Tree Care, Best Practices for Crown Pruning, and The Wound Reactions of Bamboo and Palms. There are excellent colour images and diagrams throughout.

Inevitably, given the breadth of the topic, some parts are covered quite briefly, and given that seven years have elapsed since the book was originally published, it is possible that some details have already been superseded by new research results. The issue of drill holes, and which technique is more damaging (increment core or resistance drilling) is one such example. The use of wound dressings is another. Originally dismissed by Shigo as not useful, more recent work discussed in this book clearly demonstrates that they can be useful on some species at some times of year, but that debate is ongoing. Read More "Book: The CODIT Principle. Implications for Best Practices."