VEGETABLE DISEASES. 185 



IIemedie.s. — Burn infected plants and ixxla. Do not save 

 seed from infected plants. Spray the plants before flower- 

 ing with Bordeaux Mixture (Formula 20 or 21) half its 

 normal strength, and, when the pods appear, with a solu- 

 tion of one ounce of sulphide of potassium to four gallons 

 of water as a preventive remed}^ 



Bean Rust (Uromyces Faba^). — This fungus develops 

 on the foliage and stems of the broad bean, covering them 

 with a rust-coloured powder. If very prevalent the crop 

 is seriously injured in consequence. 



Kemedy. — There is none, but after the beans are 

 gathered the stems should be collected and burnt, to de- 

 stroy the resting spores. 



Beetroot and Mangrold Rot (Sphitrella tabifica). 

 — A minute parasitic fungus, which first attacks the leaves 

 and then the roots of the beet, mangold, and potato. It 

 has only recently been discovered to attack the latter crop. 



Remedies. — (1) Avoid growing above crops on the same 

 plot for five or six years after an attack. (2) Burn all in- 

 fected roots and leaves. (3) Dress plots with gas-lime in 

 autumn. 



Beet Rust (Uromyces betae). — The foliage of beet is 

 sometimes badly attacked by a rusty mould which seri- 

 ously cripples the growth of the plants. The fungus first 

 shows itself in the form of minute cups with whitish edges 

 and congregated in clusters on the surface of the leaves. 

 In due coui'se these develop into a blackish-brown rust or 

 mould. 



Remedies. — The best remedy is to spray the foliage with 

 the Woburn Bordeaux Emulsion (Formula 21), or ordinary 

 Bordeaux Mixture (Formula 20) in June. When only a 

 stray leaf here and there is attacked pick it off and burn 

 it. When the crop is lifted, all infected leaves should be 

 burnt, not left on the ground to rot or given to pigs, other- 

 wise the fungus will reappear the next season. 



