Plan t- Diseases. 



57 



Rose, continued. 



Mildew (Sphcerotheca pannosa, Lev.). — Whitish mildew attack- 

 ing 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. 



Remedies. — Fumes of sulphur. Copper fungicides. 

 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. 



Remedy. — Spray with Bordeaux mixture or other fungi- 

 cides. 



Spinage. — Several fungi attack the spinage, of which the follow- 

 ing are the worst : 

 Mildew (Peronospora effusa, Rabenh.). — Producing violet-gray 

 patches upon the under side of the leaves and yellow spots 

 above ; 



Anthracxose (Collctrotrichum Spinacece, Ell. & Hals.). — Pro- 

 ducing brown and gray blotches upon the leaves ; 



Leaf-Blight (Phyllosticta Chenopodii, Sacc.). — Forming many 

 minute pimples on the leaf, usually upon its under surface ; 



Whit Smut (Entyloma EUisii, Hals.). — Covering the whole leaf 

 with a white coat. 



Remedies. — No definite remedies are yet known for these 

 diseases. Sprays of some of the sulphur fungicides may 

 check them. Burning all affected plants, and rotation, are to 

 be advised. 



Strawberry. Mildew (Sprceotheca Castagnei, Lev.). — A whitish 

 cobweb-like mildew spreading over the fruit and leaves. 



Remedy. — If the disease is discovered early enough, some 

 liquid fungicide, as ammoniacal carbonate of copper or Bor- 

 deaux mixture, should be employed. 

 Strawberry Leae-Blioht or Sux-Burn (Sphcerella fragariw, 

 Sacc, including Ramularia). — Small purple or red spots 

 appearing on the leaves. They eventually become larger and 

 browner, making the leaf appear blotched. 



Remedies. — Spray with Bordeaux mixture or ammoniacal 

 carbonate of copper at intervals of two weeks, beginning 



