Tree Diagnosis
How Sonic Tomography Works: Reading the ArborSonic 3D in Japan’s Tree Diagnosis
A sonic tomograph does not photograph the inside of a tree. It measures one thing only: how long…
Japan Blue Arborist Journal
Sharing Japanese Arboriculture with the World.
A journal on tree diagnosis, garden design, urban greening, and planting management from Japan.
Field experienceKnowledge from practiceScientific tree diagnosisObservation before assumptionJapanese cultural contextRoots in place and historyPrimary information from JapanFirst-hand field notes
Concept
Trees are storytellers of Japan'sculture, landscapes, and future.
Japan Blue Arborist Journal is an international journal on Japanese arboriculture and tree culture.
Latest from the Journal
Notes from the field
Tree Diagnosis
Hiroshima’s Survivor Trees Still Lean Toward Ground Zero: What 81 Years of Scar Tissue Tells a Tree Doctor
Hiroshima’s survivor trees — hibakujumoku (被爆樹木), the trees that lived through the atomic bombing of 6 August 1945 — still…
Tree Diagnosis
How a Resistograph Works: Reading the IML-RESI PowerDrill in Japan’s Tree Diagnosis
A resistograph does not show you the inside of a tree. It records resistance along a single line…
Four pillars
Ways of looking at trees
01
Tree Diagnosis
Reading tree condition through field observation and diagnostic methods.
02
Tree Culture
Trees inside a living cultural, historical, and spiritual context.
03
Gardens
Garden design, planting, and long-term stewardship.
04
Urban Trees
Management of trees where cities, people, and ecology meet.
Author
Isaki Kasahara
A field-based arborist documenting Japanese trees, gardens, and the practical knowledge that supports their care.