U.S. Department of Agriculture, Forest Service, Northeastern Forest Experiment Station. This guide shows, in 110 photos, how discoloration and decay form in trees. An expanded concept of tree decay is given. After wounding, trees form boundaries to resist the spread of pathogens. The expanded concept and the model are used to reexamine many other tree problems.
Defects are major causes of low quality in trees.
Use of the information in the guide can help foresters and urban foresters to grow healthier, higher-quality trees. A Photo Guide Part A l-56 p. A Photo Guide Part B 57-lll p. Compartmentalization of decayed wood associated with Armillaria mellea in several tree species. Compartmentalization in the sapwood began after the tree walled off the area of dead cambium associated with the inflection of the fungus.