302 AGRICULTURE OF MAINE. 



This disease was given attention before that time, first by the 

 botanist and later by the horticulturist of the Station. In this 

 early work the disease was described and the results of 

 spraying experiments were given. 



Since that time the methods of controlling apple scab have 

 received attention from time to time. On account of the injury 

 to foliage and fruit of certain varieties caused by bordeaux mix- 

 ture the pathologist began experiments in 1908 in the use of 

 lime-sulphur as a substitute for bordeaux mixture in the control 

 of this disease. This line of work was given over to the horti- 

 culturist after 2 years comparison of self-boiled lime-sulphur 

 with bordeaux mixture. 



In the summer of 1908 work was begun in the accumulation 

 of data in regard to the occurrence and importance of the 

 fungous diseases of tlie apple in Maine. Material of diseased 

 leaves, wood and fruit was collected from a large number of 

 widely separated places and the fungi isolated from this mate- 

 rial have been studied in order to determine the extent to 

 which they are causes of disease. This has necessitated a 

 large amount of culture work and extensive inoculation experi- 

 ments. 



The leaf-spot of the apple is a disease wdiich is very common 

 in neglected orchards in ]\Iaine. This disease caiises consider- 

 able loss as the leaves which contain areas of dead tissue 

 cannot perform their fvmctions. A large number of fungi have 

 been found associated with leaf-spot in Maine. Inoculation 

 experiments with material of the different fungi from pure 

 cultures showed that only one causes the disease. This fungus 

 also causes a decay of the fruit and canker of the branches of 

 the tree. It is only by knowing that this fungus causes these 

 different diseases that methods of control can be worked out. 



As a result of the studies of apple diseases a bulletin has 

 been prepared which treats in a comprehensive manner of the 

 occurrence and methods of treatment of the various important 

 apple diseases of Maine, other than those caused by insects. 

 The descriptions and illustrations of the different diseases 

 should enable the fruit grower to recognize them when they 

 occur in his orchard. 



Some of the fungi which are encountered in this work 

 are either undescribed or have not been described as causes of 



