350 MAINE AGRICULTURAL EXPERIMENT STATION. TQIO. 



beneath shows that they are brown in color and have become 

 somewhat dry and spongy. In some cases the Baldwin spot ap- 

 pears on apples as they are ripening but in other cases it develops 

 in storage. It may be confined to individual trees in an orchard 

 or to certain branches of a tree. 



In late stages the tissues beneath the spots become shrunken 

 so that the pitting is deeper. The brown coloring is not con- 

 fined to the region just beneath the spot but is found also in the 

 tissues surrounding the vascular bundles in later stages. 



This disease should not be confused with the spot of apples 

 caused by the fungus Cylindrosporium pomi Brooks, see page 

 356. The fungous disease can be controlled by spraying but 

 the Baldwin spot cannot be controlled by that means. The 

 writers believe that confusion of these two spots of apples in the 

 past is responsible for reports which have been made of the con- 

 trol of Baldwin spot by spraying. The cause of the trouble is 

 not well understood and until this is known little can be done 

 toward finding methods of prevention. 



In many of the earlier descriptions, spots on apples caused by 

 the fungus were confused with spots which are not caused by a 

 fungus and a composite description was made. In New Hamp- 

 shire Experiment Station Report 20, p. 342, Brooks says : "It 

 would be difficult to decide from the earlier descriptions given in 

 the bulletins of the New Hampshire Station whether the Fruit 

 Spot or the Fruit Pit (the original Baldwin spot) was under 

 special observation. The descriptions are better if taken as 

 applying to the two diseases than if considered as applying to 

 either to the exclusion of the other. The spraying experiments 

 were undoubtedly made upon the Fruit Spot. So far as the 

 writer has been able to learn, a distinction between these two 

 diseases has never been made." 



The fact that the two diseases were sometimes confused and 

 considered as one before the time of Brooks' publication togeth- 

 er with the name which he has applied to the fungous disease 

 has led a number of people to conclude, without careful study 

 of the distinction which he has made, that all of the spotting of 

 Baldwin apples is due to the fungus Cylindrosporium pomi. 



The observations of the writers have convinced them that the 

 Baldwin spot is of common occurrence in Maine, and that apples 

 affected by this disease are more seriously injured than are Bald- 

 win apples affected by the fungous disease. 



