food material, hut also causes more or less permanent injury to its organs 

 by destroying sections of them entirely, that takes years for the trees to 

 replace, and which sometimes never heal over. With the destruction of 

 certain parts of the organs of the tree, the work of the tree in producing 

 high-class fruits is proportionately impaired. These injuries form an excel- 

 lent medium for the attack of other fungous diseases and for the attack 

 and protection of certain insect pests. Control of pests is made more difficult 

 in a tree more or less injured by the disease, as thorough work in spraying 

 is made much more intricate than on a healthy clean-bark tree. By observing 

 orchards in Itritish Columbia, especially in the Coast districts, we frequently 

 notice trees with dead and dying limbs or a more or less sickly appearance 

 making poor growth, which on close examination reveal the principal cause 

 of their condition as black-spot canker, sometimes with subsequent attack 

 of woolly aphis, some form of Nectria or other pests often associated with 

 the disease. With these facts in view, the fruit-grower who is financially 

 interested in his orchard, and who does not want to have an orchard which 

 is a menace and an eyesore to his district, can realize the importance of 

 becoming acquainted with the nature of the disease, as also proper means 

 of prevention and remedies, making use of them to the best of his ability. 

 The disease attacks the apple-tree, causing injury to trunk, limbs, and 

 fruit. Cankers similar in appearance have been found on the plum, prune, 

 and cherry, but the writer is not aware that satisfactory proof has been 

 found to positively connect the fungus with the canker, although they show 

 a notable resemblance. 



of i.|'l>l'--n -< NhowliiK <'iiiikT>l urea with MiibHtMiueiit attack of 

 woolly iiphiM. 



