Show your commitment to proper tree care! This 2008 reprint makes Modern Arboriculture one of the most studied, requested and acclaimed books of Dr Alex L. Shigo. Modern Arboriculture covers the tree system; how it grows, how it defends itself, and how it eventually dies. Shigo claims many of the old treatments have hurt the tree system and arborists must make adjustments to past practices. The book covers standard 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.