40 The Horticulturist' s Rule- Book- 



Bordeaux mixture, continued 



to remain a few minutes, then rinse once or twice. Dip 

 the grapes by placing them in a wire basket. 

 Carbolic acid (Phenic acid]. i. J pt. in 10 gals, of water. 

 For powdery mildew of the vine. 



2. Soap-suds, 10 gals. ; glycerine, i Ib. ; carbolic acid, l / 2 

 pt. Mix thoroughly, to form an emulsion. For orange- 

 leaf scab. 



Chloride of iron. A very dilute solution of chloride of 

 iron has been used with success in combating the coffee 

 disease due to Hemileia vastatrix. The solution is applied 

 to the under surface of the leaves by means of a pulveri- 

 zator or spraying apparatus. Its sticky nature causes it 

 to adhere for two months. It is suggestive in connection 

 with some of our plant diseases. 



David's powder. Dissolve 4 Ibs. of sulphate of copper 

 in the least possible amount of hot water, and slake 16 Ibs. 

 of lime with the smallest quantity of water required. 

 When the copper solution and slaked lime are completely 

 cooled mix them together thoroughly ; let the compound 

 dry in the sun, then crush and sift. Apply with a sulphur- 

 ing bellows furnished with an outside receptacle for the 

 powder. For downy mildew and black-rot of the grape, 

 mildew and anthracnose. 



Destroying affected parts. It is important that all affected 

 parts should be removed and burned, if possible. In the 

 fall all leaves and fruit which have been attacked by fungi 

 should be raked up and burned. Diseased branches 

 should be severed at some distance below the lowest 

 visible point of attack. Fungous diseases often spread 

 rapidly, and prompt action is usually necessary. 

 Eau celeste. i (Audoynaud process]. Dissolve i Ib. of sul- 

 phate of copper in 2 gals, of hot water. When com- 

 pletely dissolved and the water has cooled, add i^ pts. of 

 commercial ammonia (strength 22 degrees Baume). When 

 ready to use, dilute to 22 gals. For treatment of downy 



