FLORA General TREES
AS NEW COPY! pp. 424 illusts #300724
A. L. Shigo amount arboriculture arborists arrows associated axial parenchyma barrier zone begins boundaries branch collar buds callus cambial zone cankers chemicals chlorophyll city trees CODIT codominant codominant stems columns of discolored compartmentalization conifers cracks dead spots decayed wood decrease defect defense develop diagram dieback discolored and decayed discolored wood disease drill Dutch elm disease dynamic mass electrical resistance electrode energy reserves enzymes false heartwood fertilizers flush cuts fungi fungus growth increment healthy holes included bark increase infected injury leaves lignin living cells meter microorganisms MODERN ARBORICULTURE molecule mycorrhizae nitrogen parenchyma parenchyma cells pathogens patterns phloem photosynthesis Phytopathology pith plants potential energy problems pruning radial removed ring porous sapwood seesaw Shigometer soil sound wood species spread sprouts sugar maple survival symplast tion tissues tracheids transverse treatments tree system trunk twigs vessels walls wetwood wetwood fluids woundwood xylem young trees