CANKER—SUN-SCALD—GUMMOSIS 63 
bark and sets up decay. Sun-scald often causes the bark 
to split and crack open. This is especially true of fruit- 
trees planted at high altitudes owing to the very hot days 
followed by cold nights. Anthracnose does its deadly 
mischief underneath the bark, and causes a hollow space 
to come between the bark and the stem. If this is cut 
open, it will be found to contain a semi-liquid gum or 
sticky exudation. This must be very carefully scraped 
away and very carefully burned, and the wound painted 
with liquid corrosive sublimate. 
Cherry-trees are very subject to an exudation of gum, 
known as gummosis. This seems to be due to a variety 
of causes, or at any rate a variety of causes contribute to 
its appearance. If the exuding gum is hard, it will not 
do much real harm. If, however, it is soft and gum- 
like in consistency, it should be carefully scraped away 
and burned, and the wounds painted with corrosive 
sublimate. 
