DISEASES AND OTHEE ENEMIES. 



303 



its bulbs; a rust, Puccinia gladioli, Cast., upon the 

 leaves, and several blights ; as, for example, Sphcerella 

 fusca, Pass., upon the foliage. Enough has been given 

 to show that the bulbous ornamental plants are not 

 exempt from the fungus troubles that other cultivated 

 plants are heir to. 



Returning now to the Lily Disease so called, we find 

 it an old destructive enemy. It has been studied exten- 

 sively by fl. Marshall Ward, who gives it a whole chap- 

 ter in his work upon 

 "Diseases of Plants." 

 The same subject was 

 investigated by Mr. A. 

 S. Kean, formerly a 

 student in my labora- 

 tory, in Bermuda, where 

 the growing of Lilies 

 is a leading industry, 

 and the disease is a 

 serious menace. His 

 results were published, 

 with a large plate, in 

 the Botanical Gazette BOTRYTIS FUNGUS, MAGNIFIED. 

 for January, 1890. Professor Ward calls the Lily Disease 

 one of the most annoying pests that the horticulturist 

 bas had to trouble him of late years. The trouble first 

 shows itself as small rusty spots upon the buds and 

 leaves, and by their enlarging the blossoms are ruined. 

 The engraving on Page 302 shows the upper portion of 

 a Lily plant, with the four buds badly attacked by the 

 Botrytis fungus. This Botrytis consists of coarse 

 threads, which run in all directions through the attacked 

 tissue, and finally appear upon the surface as upright 

 branched stalks, bearing multitudes of spores. A mag- 

 nified view of a section of the diseased tissue is shown 

 in the engraving on this page. 



