BOUILLIE BORDELAISE. 



25S 



black rot with the bouilUes in use against mildew, and encouraging- 

 results have been obtained. Galloway submitted different vines to- 

 the different treatment summed up in the following table : — 



TABLE XLVIII. — Showing Results of Repeatedly Spraying Vines with Blue- 

 Vitriol SoUdions of Various Strengths. 



These experiments show plainly that the concentration of the 

 bouillies is less important than the frequency of sprayings, and the 

 choice of the time at which they are executed. Trials with 0-5 per 

 cent bouillies gave favourable results, and Ecluse recommends to 

 overcome black rot by the classical treatment for mildew, provided 

 the first May spraying be done with a bouillie of 6 per cent of blue 

 vitriol and 3 per cent of lime. It is not impossible for weak bouillie 

 to give good results, but it must not be forgotten that in many cases- 

 the struggle is difficult, and the treatment applied against mildew is- 

 impotent against black rot. We therefore believe that it is indispens- 

 able to follow the method so carefully studied by Prunet, consisting in 

 the use of 2 per cent bouillies, a method capable of entirely preventing^ 

 black rot, and of which the efficiency against mildew is absolute. 



Coniothyrium Diplodiella, Sacc. (white rot, pale rot, livid rot). — 

 Although the preventive or curative treatment against this disease- 

 gives imperfect results, none the less it is recommended by Viala and 

 Sorauer. But its application is difficult, because to obtain a satis- 

 factory result the preventive sprayings on the grape must be done 

 immediately after the formation of the wounds on the grape stalks, so* 

 as to prevent the spores from penetrating into the wounds. 



AUernaria Solani, Sor. ; Macrosporiiim Solani, Ell. et Mart. — Eolfs, 

 Weed, Selby, Burrill, McClure, Earle, and Galloway declare that 

 bouillie bordelaise overcomes this disease. Galloway advises a bouillie 

 of 1'5 per cent blue vitriol and 1 per cent of lime. The first spraying; 

 is done with care, before the spots appear on the plant, so that all the 

 leafy surface is covered with cupric hydrate. 



AUernaria Brassicae f. nigrescens, Peglion (scorching of the leaves- 

 of the melon). — The use of bouillie bordelaise was advised by Peglion. 

 It gives good results. The first spraying should be given the moment. 



