54 The Horticulhiris? s Rule- Book. 



Kose (Leaf -blight or Black-spot) , continued. 



small black spots, but later covering nearly or quite the 

 whole surface with blotches. The spots have frayed*edges 

 Common in out-door and house culture. 



Remedies. In the house, fumes of sulphur. Out of 

 doors, burn the affected leaves and spray with Bordeaux 

 mixture or eau celeste. Spray before the leaves unfold. 



LEAF-SPOT (Cercospora rosczcola, Pass.). Black or red- 

 dish-black spots on the leaves, shading into red at the 

 definite edges. Later the center of the spot becomes 

 light brown or gray. Attacks plants growing out of doors. 



Remedies. Burn diseased parts. Plant in an airy and 

 dry place. 



MILDEW (Sphczrotheca pannosa, Lev.). Whitish mildew 

 attacking roses. It is brought on, according to Maynard, 

 by exposure to drafts of extremely cold air when the 

 plants are growing rapidly, by high temperature running 

 the same day and night, by watering just before night, by 

 too little water, by extreme dryness, by poor drainage, by 

 deficiency in plant food. 



Remedy. Fumes of sulphur. 



RUST (Phragmidium mucronatum, Winter). Appears 

 in small and scattered bright yellow spots or pustules on 

 the leaves, which at length become distorted, and upon 

 the young growth. 



Preventive. Spray with eau celeste early in the season. 



Remedy. Spray with sulphate of copper or other fungi- 

 cides. 



Strawberry. MILDEW (Spcerotkeca Castagnci^ Lev.) 

 A whitish cobweb-like mildew spreading over the fruit 

 and leaves. 



Remedy. If the disease is discovered early enough, some 

 liquid fungicide, as potassium sulphide or Bordeaux mix- 

 ture, should be employed. 



STRAWBERRY-LEAF BLIGHT or "SUN-BURN" (SpJuz- 

 rella fragaria, Sacc., including Ramularia.} Small purple 



