• Modern arboriculture is about the tree system; how it grows, how it defends itself and how it eventually dies
• Modern arboriculture is about using your mind as well as your muscles
• Many old treatments have hurt the tree system. Many adjustments to old practices must be made now.

Common tree treatments, and other seldom discussed subjects such as: symplast, tyloses, reaction wood, protection wood, genetics of CODIT, infection pathways, canker rots, wound reactions, energy flow, ATP, glycolysis, enzymes, mass-energy ratio, three-tree concept, core-skin hypothesis, mycorrhizae and phenological patterns.

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