6o The Horticulturisf s Rule- Book. 



Verbena (Rust), continued. 



Remedy. — Sulphide of potassium sprayed upon the plants 

 every few days. 



Violet. Violet Disease or Rust {Peronospora Fiolcc, DeBary ?). 

 — Appears on the leaves as small rounded black or brown 

 spots, causing the leaf finally to wither and die. 



Preventives. — It is supposed that any neglect or improper 

 handling renders the plants more liable to the disease. Burn 

 all infested plants, and do not use the same soil again for 

 violets. Sprays of copper compounds. 



Watermelon. Anthracnose or Pod-Rust. — See under Bean. 



Inasmuch as the growth of one year determines the possihility of 

 a crop in the succeeding year, it follows that judicious sprayings by 

 keeping the foliage healthy, must bring larger crops; and this 

 secondary result of spraying is usually as important as the immediate 

 result. There are failures and discouragements in spraying, but 

 they are fewer than in most' other horticultural operations even 

 iJjough the practice is yet comparatively new. 



