Chrysanthemum Diseases 239 

 LiGULE Rot 



Caused by Sclerotinia fuckeliana (De By) Fckl. 



This rot in which the ligules become involved 

 is often mistaken for a heart rot, and a destruction 

 of the receptacle. The latter disease is brought 

 about by nutritional disturbances. Ligule rot is 

 caused by the fungus, Botrytis cinera^ the fruiting 

 summer stage of Sclerotinia fuckeliana. 



Control. For ligule rot Crepin"^ recommends that 

 the flower buds be sprinkled with a solution made 

 up of two grams of chemically pure nitric acid to 

 a liter of water. 



Blossom Rot 



Caused by Sclerotinia fuckeliana (De By) Fckl. 



Symptoms, This disease is usually confined to 

 the blossoms only. The trouble first appears as 

 minute discolored watery spots on the petals, giv- 

 ing the latter the appearance of having been pricked 

 with a needle. The white-flowered varieties show 

 the spotting more distinctly than the colored ones. 

 The spots rapidly enlarge and involve the entire 

 corolla. Diseased petals wilt, and are soon covered 

 by a grayish, velvety growth (fig. 50, a), consist- 

 ing of the summer fruit (Botrytis). After the first 

 few flowers become affected, the trouble spreads 



* Crepin, H., Jour. Soc. Nat. Hort. France 11:52-59, 1910. 



