742 JOURNAL OF THE EOYAL HORTICULTURAL SOCIE'IY. 



Fig, 313 — Sections of portion of stem of two standard Apple-trees, which were 

 eventually killed by a fungus called Eutypella prunastr'i. The fungus entered the 

 stem through wounds made by pruning, and caused the discoloration in the centre of 

 the stem. The trees continued to grow for several years after the fungus entered, as 

 shown by the pale healthy wood covering the diseased portion and cut ends of the 

 pruned branches. During the eighth year after inoculation the fungus became active 

 and killed* the trees. 



