46 The Horticulturist ' s Rule- Book. 



Celery. CELERY-LEAF BLIGHT, RUST, OK SUN-SCALD 



(Cercospora Apii, Fries). Appears in hot and dry places 

 and seasons, about mid-summer. Small yellowish spots 

 appear upon the leaves, and later the leaves turn yellow, 

 then brown, and finally die. 



Preventive. Plant in a moist and cool place, and shade 

 the plants if necessary. Destroy all diseased leaves in 

 autumn. 



Cherry. BROWN-ROT (Monilia fructigena, Pers.). At- 

 tacks flowers, leaves and fruit. The flowers die and de- 

 cay, the leaves become discolored with brownish patches 

 and the fruit rots on the tree. Attacks also peaches, 

 ' plums and apples. 



Remedies. Burn all infested fruit and leaves in the fall. 

 Before buds expand in spring spray with sulphate of iron 

 When the flowers are opening, spray again with sulphide 

 potassium, and repeat the operation at intervals of a week 

 or two until the fruit begins to color. 

 LEAF-RUST. See under Plum. 

 POWDERY MILDEW. See under Apple. 



Corn. ROT. Due to bacteria. The plants are dwarfed, 

 and unusually slender. The roots become mucilaginous 

 and decay, as do the leaf-sheaths and the ears. 



No remedies or preventives are known 



SMUT. ( Ustilago Zea-Mays, DeC.). A fungus attacking the 

 ears of corn, producing familiar black abnormal growths. 

 Preventive. Plant seed from clean fields. 

 Remedies. Cut out smut and burn it. Soak seed before 

 planting in sulphate of copper. 

 Cottonwood. LEAF- RUST. See under Poplar. 

 Currant. RUST (Septoria Ribis, Desm.). Appears about 

 mid-summer, on leaves of white, red and black currants, 

 as whitish spots with black centers. It causes the leaves 

 to fall. 



Remedies. Destroy infested leaves. Spraying with 

 eau celeste or Bordeaux mixture may be tried. 



