. The care of trees in lawn, street and park. With a list of trees and shrubs for decorative use. Trees; Trees. CHAPTER IV DIAGNOSING OF DISEASES UST as the physician finds his greatest difficidty- in determining the cause of illness, so the tree doctor, although knowing the diseases to which trees are liable and knowing the remedies, may still find trouble in diagnosing the true cause of the evident abnormal condition. Here it is that experience and judg- ment come in, yet sometimes even an expert remains doubt- ful. Nevertheless, by careful examination, in many cases even the less experience
. The care of trees in lawn, street and park. With a list of trees and shrubs for decorative use. Trees; Trees. CHAPTER IV DIAGNOSING OF DISEASES UST as the physician finds his greatest difficidty- in determining the cause of illness, so the tree doctor, although knowing the diseases to which trees are liable and knowing the remedies, may still find trouble in diagnosing the true cause of the evident abnormal condition. Here it is that experience and judg- ment come in, yet sometimes even an expert remains doubt- ful. Nevertheless, by careful examination, in many cases even the less experienced can determine what ails the tree. Usually, if anything is the matter in any living part of the tree, the fohage gives the first indication, and furnishes the most readily available symptoms for diagnosis. Hence our examination begins with the foliage, to see whether it shows any divergence from normal conditions in size, quantity, form, or color. With a conception of what the normal foliage ought to be, we ascertain whether the leaves of the individual under examination are smaller than usual, or thinner, whether the foliage as a whole appears slim, whether the leaves are wholly or partially discolored, whether they are mechanically injured, eaten, crumpled, or otherwise misshapen, spotted, wilted, or dead. If no local cause, as from fungi or insects, can be ascer- tained as surely responsible, we look next for indications on twigs, branches and bole as accounting for sickly appear- ance of the foliage or death of branchlets. Mechanical 51. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Fernow, B. E. (Bernhard Eduard), 1851-1923. New York Holt
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