The expanded concept of tree decay has four major parts:

1. WOUNDS start the PROCESSES (below left). (fig. 32)

2. MANY ORGANISMS are associated in the processes (below right). SUCCESSIONS of organisms are involved in the infection of the wood. (fig. 33)

3. The tree REACTS to the wound. The living cells behind the wound react immediately (opposite page, upper left). (fig. 34)

   The COMPARTMENTED tree COMPARTMENTALIZES the injured and infected tissues (opposite page, upper right). (fig. 35)

4. DISCOLORED and DECAYED wood results, but this wood is COMPARTMENTALIZED by WALLS 1,2,3, and 4 (opposite page, lower). (fig. 36)

Figure 32

Figure 33

	Figure 35 Brown - decayed wood Green - discolored wood Red - tree chemical protective zone Orange - barrier zone - Wall 4 Blue - Wall 3 Figure 34

Figure 36