BOUILLIE BORDELAISE. 



237" 



perfectly known, so as to be able to treat it at the moment of the dis- 

 semination of the disease, and prevent in time its establishment in the 

 plant ; a slight delay in the use of the remedy may lead to complete 

 failure, for it is asserted by Prillieux that spraying after the penetration, 

 of the spores of the fungi into the interior of the tissue of the plant in 

 no way prevent its normal evolution and fructification. If a great, 

 number of fungi may thus be combated by a neutral well-made bouillie, 

 with 0"5-l-0 per cent of blue vitriol, the application of the remedy must, 

 vary with the method of propagation and evolution of the fungus. If 

 these rules are observed bouillie bordelaise gives perfect results in alll 

 cases quoted farther on. Hence there is annexed to this treatise a 

 brief sketch of the evolution and manner of life of the chief parasitic-, 

 fungi, so that the amateur little versed in these questions may find botb 

 the remedy and the best time to use it. 



Use against Mosses and Lichens. — Although cupric hydrate has- 

 not the solubility of blue vitriol its regular use on the trunks of trees, 

 helps to lessen these parasites and eventually cause them to disappear.. 

 Waite, Schoyen, Hume, and Leroux advise for this purpose a 3 per 

 cent bouillie bordelaise applied on the trunks after cleaning with a. 

 scraper. 



Use against Bacterian Diseases of Plants. — Amongst the ever- 

 increasing number of plant diseases attributable to bacteria some may 

 be combated with bouillie bordelaise. 



Potato Scab. — Bolley, who discovered the cause of the scab, found 

 that disinfection of the tubers with 2 per cent bouillie bordelaise was 

 capable of preventing the growth of this disease. He got the following, 

 result : — 



TABLE XXXYU.—Show'mg Effect of 2 Per Cent Bouillie Bordelaise in Pre- 

 venting Potato Scab. 



Longer steeping of the seed in bouillie bordelaise does not injure the 

 seed if it has not sprouted. 



Bacterian Disease of the Wild Quince-tree. — This disease known in 

 America has been successfully treated with bouillie bordelaise. 



Use against Parasitic Myxomycetes. — Plas7)iodiophora cali- 

 fornica, Viala and Hauvageau (browning of the vine or the Californian 

 disease). — This disease cannot be treated with bouillie bordelaise- 

 (Sorauer). 



Use against Parasitic Fungi. — Peronosporce. — The eighty known 

 species, each more formidable than the other, have the same evolution 



