Vol. 35 



BULLETIN 



No 9 



OF THE 



TORREY BOTANICAL CLUB 



SEPTEMBER, 1908 



I 



The Fruit Spot of apples 



Chari.es Brooks 



■ 



(with plates 29-35) 



A considerable percentage of the Baldwin apples of New Eng- 

 land are marred by the presence of certain fruit spots, described 

 m the bulletins of the New Hampshire Experiment Station as the 

 crown Spot of Baldwins. The following paper is a report of the 

 results obtained in an effort to determine the cause of this spot, 

 its morphological and physiological characteristics, and means of 

 prevention. A brief review of earlier work on this and closely re- 

 lated effects will be of value in the later presentation of the subject 

 matter. 



Review of literature 



In 1879 Soraue*r (1) described a disease which he called the 

 " Stippichwerden der Aepfel." According to his description, 



rown or blackish brown spots developed on the surface of the 

 fruit, extending into the flesh only .5 to 1.5 mm. These spots 

 remained isolated and never involved the whole fruit. He found 



at tne y might remain without development for a long time and 

 ater develop rapidly in storage. He considered the spots to be 

 ^ to a decomposition produced by a particular fungus and gave 



X ocaea p °wi, previously described by Fries (2), as the probable 



Spit, 



a gency. 



Reichelt (3) reported a similar spot on apples but found that 

 Has cau sed by a fungus belonging to the genus Sy nchytrium . 

 Frank (4) thought that the Spilocaea Pomi of Fries was a 



l9 Jg * Bulle tin for August. 1908 (35 : 371-422. //. 26-28) was issued 26 Au 



423 



