Grape Anthracnose. 37 



water. Practically this same solution is more or less used to- 

 day, but it is known as the "modified eau celeste." Patrigeon 

 at the time of its introduction, referred to it simply under the 

 name of the hydrocarbonate of copper dissolved in ammonia. 



The " bouillie berrichonne" is a third preparation introduced 

 by Patrigeon. This was made like the preceding, with the 

 exception that only a portion of the copper precipitate was dis- 

 solved by ammonia, instead of all of it. He desired that only 

 one-third be dissolved. This portion would have an immediate 

 action upon fungi, while the remaining undissolved part would 

 act as a reserve supply. Later investigations have shown that 

 such preparations are unnecessary for the successful treatment 

 of fungous diseases. 



The anthracnose of grapes was at this time receiving consider- 

 able attention. No reports of success in treating the disease 

 during the growing season are reported, but all recommenda- 

 tions are to the effect that applications should be made during 

 the winter. The following treatments appeared to be most 

 promising. 2 The first formula was proposed by Michel Perret: 



1. Copper sulphate 10 kilos. 



Iron " 10 " 



Water 100 liters. 



2. The Schnorf 3 treatment (see page 23) consisted in applying 



Iron sulphate 50 kilos. 



Water 100 liters. 



3. Ordinary Bordeaux mixture : 



Copper sulphate 8 kilos. 



Lime 15 " 



Water 130 liters. 



4. The same as 3, but 12 kilos of copper sulphate were 

 used instead of 8. This gave the best results, but numbers 2 

 and 3 follow closely. The first proved to be much less satis- 

 factory. 



1 Jour. VAg. Prctf. 1887, May 5, 641. 



* Millardet, " Nouvelles Recherches sur le D6vloppement et le Traitement du 

 Mildew et de 1' Anthracnose," 18S7, 56. 

 Ibid. loc. cit. 



