DIVISION OF BOTANY 849 



SESSIONAL PAPER No. 16 



ieties there is a good deal of the shot hole etiect on weak or unhealthy trees, but on 

 ordinary plums the fungus only attacks the leaves late in the season when they are 

 declining in vigour. Under these conditions leaf spot is only produced as a rule. 



Sl'x Scald. — An injury similar to that discussed under the apple is very common 

 on plums throughout the Niagara district. The part usually affected in this case is 

 the trunk, and whole orehards may be found in which the trunks of all the trees have 

 dead strips on the south or southwest sides. The injury is caused by winter conditions 

 and, as in the case of apples, whitewash applied to the trunks in fall or early winter 

 helps to prevent it. Trees already injured should have the dead areas cut out and. 

 painted. 



W. A. McCUBBIN. 



ACKNOWLEDGMENTS. 



In concluding this report I desire tO' express my indebtedness to the members of 

 my staff who have, through their industry and close attention to their duties, consider- 

 ably aided me in the carrying out of various phases of research and other work of 

 the Division. 



H. T. GUSSOW, 



Dominion Botanist. 

 March 31, 1914. 



Ottawa. 



