Mignonette Diseases 287 



Leaf Spot 



Caused by Cercospora resedcz Fl. 



Symptoms, The trouble becomes apparent as 

 minute pale spots with yellowish to brownish bor- 

 ders. In spreading over the entire leaf, it takes on 

 a reddish discoloration. Usually, the lower leaves 

 are most affected. Little is now known of the causal 

 organism. 



Root Rot 



Caused by Rhizoctonia sp. 



Root rot of mignonette may be expected wherever 

 the soil in the benches is infected with Rhizoctonia. 

 The young plants usually damp off. Older ones rot 

 at the base of the stem and at the roots. In either 

 case, affected plants are dwarfed, and the leaves have 

 a sickly yellow color. For a description of the or- 

 ganism and for methods of control, see p. 20. 



Narcissus {Narcissus bulbocodium) 



Cultural Considerations, Narcissus is easily 

 forced. After potting, a thorough watering should 

 be given, as the bulbs fail to set roots in a dry soil. 

 The pots should be placed in a cool cellar to en- 

 courage root formation and to retard top growth. 

 After bringing the pots into the greenhouse, they 

 should at first be placed under the benches or under 

 subdued light, and in a low temperature of about 

 50 degrees F. Later the plants are gradually ex- 



