Hyacinth Diseases 269 



XBSISTANT NON-RESISTANT 



In Holland the disease is kept in check by the de- 

 straction of diseased plants. Diseased bulbs should 

 never be planted since they will surely introduce 

 the disease in new localities. Spraying in this case 

 will be of no benefit. 



Damping Off 



Caused by Dictyuchus monosporus Seitg. 



Symptoms. The above fungus causes a serious 

 damping off, the symptoms of which resemble those 

 of other plants. Dictyuchus monosporus is the only 

 one of the genus Saprolginiacese which is reported 

 by Halsted as being parasitic on plants. 



The Organism. The sporangia are clavate. The 

 swarm spores become walled within the sporangium 



