11 



Discussion. 



Prop. Bailey: Are the trees that have been thoroly sprayed 

 as liable to attack as unsprayed trees? 



Me. Whetzel: I do not think it makes any difference as the 

 canker develops where there has been some wound. Unless bor- 

 deaux was applied to a wound as soon as it was made it would 

 not prevent infection. We treated a large number of trees with 

 Bordeaux mixture of double strength and I could not see that it 

 made any difference in the number of infections. 



Mr. Sirrine : Are there any ill effects from the use of linseed 

 oil? 



Mr. Whetzel: The tissue dies back a little but not enough 

 to cause any trouble. 



Mr. Eustace: Have you observed much twig infection? 



Mr. Whetzel: I found practically no active cankers in the 

 Hudson river valley, where the last two seasons have not been 

 favorable for the development of this disease. However, around 

 Ithaca the last two years have been good for the disease and twig 

 blight and active cankers are easily found. The work of the 

 ■disease in the Hudson River valley was chiefly done during the 

 seasons of 1902 and 1903. 



