out showing signs of the rot, and cultures made from tomatoes just 

 beginning to rot would not yield the Alternaria." 



In an article on Blossom End Rot in the English " Journal of 

 the Board of Agriculture," by Charles Whitehead 2 , the cause of the 

 disease is attributed to Cladosporium lycopersici, " This rot," it is 

 stated, " must not be confounded with the other tomato affection 

 known as ' Black Rot,' due to another fungus termed Macrosporium 

 tomato, Cook. This is not confined to the lower part or style end of 

 the fruit. The color of the rot is altogether much darker than the 

 decay consequent on the attack of Cladosporium lycopersici.'''' The 

 same worker noticed another fungus in tomatoes infected with 

 Cladosporium lycopersici, having a mycelium more delicate and slen- 

 der than that of Cladosporium, and quite colorless. This permeated 



Fig. i. Section of the natural spot showing dead 

 cells, masses of starch and mycelium of Fusarium. 



the tissues of the fruit and lived upon it, penetrating further into the 

 healthy tissues than the Cladosporium, though the Cladosporium 

 was " evidently the originator and main cause of the mischief." 



The same writer states that Dr. Plowwright in 1881, presumably 

 in the same journal, reported both a Cladosporium and a Macro- 

 sporium in connection with the disease, the Macrosporium being 

 identical with Macrosporium tomato, Cook, of Galloway, previously 

 quoted. 



In 1900, F. S. Earle\ of the Alabama station, published the results 

 of work on the " Black Rot or Blossom-end Rot," as follows : 



" When tomatoes are attacked by this disease in the field, the first 

 stage to be noted is the appearance of a small, irregular, watery 



