56 HORTICULTURIST'S RULE-BOOK. 



FAIRY-RING SPOT (Heterosporium echinulatum, Cooke). 

 Produces circular light-colored spots upon the leaves. 

 The fungus grows centrifugally, usually giving rise to 

 successive rings of light and dark color. 



Preventives. Care in selecting stock. Bordeaux mixt- 

 ure. 



RUST (Uromyces caryophyllinus, Schr.). Produces gray 

 blisters upon the leaves, the spots finally rupturing and 

 showing the rusty discoloration of the spores. 



Preventives. Careful picking and burning of the in- 

 fected parts is one of the surest preventives of further 

 attacks. Spray with Bordeaux mixture. 

 SPOT or BLIGHT (Septoria Dianthi, Desm.). Attacks the 

 leaves in large brown or purplish spots, which have a 

 whitish centre, or occasionally the whole leaf becomes dis- 

 colored and wilts. Sometimes attacks the flower-stems 

 and the flowers do not open. 



Preventives. If the disease is feared, be careful not to 

 apply water to the leaves. Ammoniacal carbonate of cop- 

 per or Bordeaux mixture. Burn all infested leaves. 

 Celery. CELERY LEAF-BLIGHT, RUST or SUN-SCALD ( Cercospora 

 Apii, Fries). Appears in hot and dry places and seasons, 

 about midsummer. Small yellowish spots appear upon 

 the leaves ; later the leaves turn yellow, then brown, and 

 die. 



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

 the plants if necessary. Destroy all diseased leaves in 

 autumn. 



Eemedy. Spray with Bordeaux mixture early in the 

 season, and with ammoniacal carbonate of copper later on 

 if continued treatment is necessary. 



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

 flowers, leaves, and fruit. The flowers die and decay, 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 



