BOUILLIE BOEDELAISE. 



239 



TABLE XXXVIII. — Showing Effect of Bouillie Bordeloise of Various Strengths 

 on Weight and Starch Content of Potato Cro'p and Per Cent of Diseased 

 Potatoes. 



The number of sprayings in the year thus has a great effect on 

 ■the efficiency of the treatment. Thienpont showed that the effects 

 obtained by several sprayings are always superior to those obtained by 

 a single spraying. Laplae, in this connexion, got the following 

 results : — 



TABLE XXXIX. — Showing Beneficial Effect of Repeated Spra\ji7ig ivith Copper 

 Bouillies on Potatoes. 



Diseased plants untreated 10-44 metric tons per acre. 

 ,, 1 spraying 10-88 ,, ,, 



,, 2 sprayings 11-94 ,, „ 



3 sprayings 12-88 



As to the weight of the crop, a great number of trials have proven the 

 efficiency of the bouillie bordelaise. Prillieux obtained with nine 

 plants : — 



TABLE XL. — Showing the Effect of Bouillie Bordelaise on the Potato Disease. 



Steglich tried this treatment on six different species, planted in plots 

 of 50 square metres, and in all cases obtained yields of from 10-80 per 

 cent higher than that of the untreated plot. The treatment consisted 

 in three sprayings : on 12 June, 17 July, and 15 August. Andra, 



