288 Diseases of Greenhouse Crops 



posed to more light. The more slowly they are 

 forced the better the quality of the flowers. Dur- 

 ing the blossoming period great care should be given 

 to the watering. At no time should the root system 

 be permitted to become dry. On bright days the 

 tops of the plants should be syringed until the flow- 

 ers begin to show color. 



Diseases of the Narcissus 



Narcissus under normal care is very hardy and 

 subject to very few diseases. 



Rust 



Caused by Puccinia schrceteri Pass. 

 This rust often attacks Narcissus poeticus. It is 

 of no economic importance in the United States. 



Bulb Rot 



Caused by Fusarium bulbigenum Mass. 



Symptoms. This trouble, which was studied by 

 Massee,* is said to be prevalent in England. Its 

 presence in the United States has not been reported. 

 The trouble first appears on the leaves as small 

 yellowish spots. These, however, enlarge and work 

 downward into the bulb scales, the latter of which 

 soon rot. The disease is spread by partly diseased 



* Massee, G., Roy. Bot Gard. Bui. Misc. Inf.: 307-309, 1913. 



