l6 MAINE AGRICULTURAL EXPERIMENT STATION. 



the case. Bitter-rot canker has been observed but has not yet 

 produced any appreciable damage. Blight, which is very severe 

 on certain varieties of trees in the northwest, has not yet been 

 listed among the Maine apple diseases. Only one case has 

 been observed which in any way suggested the presence of this 

 malady. Pears in Maine appear to be particularly free from 

 this disease also. 



Crown gall, the dangerous bacterial disease of apples and 

 many other plants, particularly representatives of the same 

 family as the apple, has been found to occur several times on 

 nursery stock imported into this State. So far it has not been 

 found by this Station upon nursery stock grown in the State. 



APPEE SPRAYING INVESTIGATIONS. 



While spraying is necessary and essential to the control of 

 several apple diseases, the chief object of the use of fungicidal 

 sprays on apple trees in Maine is for the control of apple scab. 

 This fungous disease, while most conspicuous on the fruit, does 

 much damage to the leaves and, as has already been pointed out, 

 may at times seriously injure the young growth on the tips of 

 the branches of susceptible varieties of trees. 



The application of any agent which will kill the causal fungus 

 will prevent the spread of the disease. Unfortunately many of 

 the remedies tried in the past while effective in controlling the 

 disease frequently injure the foliage or fruit, or both, with 

 varying degrees of severity, sometimes doing more damage than 

 the disease itself. This Station, in common with many others 

 has given much attention to the development and testing out of 

 various sprays with the hope of finally securing one which 

 would effectually control scab and kindred diseases and still be 

 free from the production of any form of spray injury. The 

 purchase of Highmoor Farm by the State and placing it under 

 the control of this Station has made it possible to do more work 

 in this line in a few years' time than has been accomplished 

 during all the preceding years of the Station's existence. A 

 very satisfactory degree of success has been attained, except 

 with the case of the more susceptible varieties. The problem 

 still remains to find some material which shall be effective and 

 yet be perfectly safe under all conditions. 



