PLATE 7 
Method of cutting away diseased bark in treatment of a severe case of Pythiacystis 
gummosis. 
A. —Result of inoculation with diseased bark containing Pythiacystis citrophthora 
on November i6, 1912. Photographed September 3, 1913. Invaded area 21.5 by 
7.5 cm. 
B. —Bark cut away September 3, 1913, on a similar tree in treatment. 
C. —Same tree after painting with Bordeaux paste. 
p.—Same tree on March 17, 1916, showing growth at edges of wound and asphalt 
paint on exposed wood. 
