48 horticulturist's rule-book. 



Bordeaux mixture is the best general fungicide. It is 

 used for downy mildew and black-rot of the grape, blight 

 and rot of the tomato and potato, blights of fruit, and 

 many other diseases. 



Sometimes the mixture is not washed off grapes or plums 

 by the rains. In this case, add one quart of strong cider- 

 vinegar to 5 gallons of water, and dip the grapes, allowing 

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

 Dip the fruits by placing them in a wire basket. 



Carbolic acid (phenic acid) . — Soapsuds, 10 gallons ; glyc- 

 erine, 1 pound ; carbolic acid, | pint. Mix thoroughly to 

 form an emulsion. For orange-leaf scab. 



Copper, precipitated carbonate of. — Dissolve 2 pounds of 

 sulphate of copper in hot water, and in another vessel 2 1 

 pounds of sal soda in hot water ; when cool, the two are 

 added together with constant stirring. The mixture is then 

 diluted to 25 gallons. For diseases of the grape. 



Copper sulphate. — See Sulphate of Copper. 



Corrosive sublimate (bichloride of mercury). — Used for 

 potato scab, which see in Chap. IV. 



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. Practise clean and 

 tidy culture. 



Eau celeste. — 1 (Audoynaud process). Dissolve 1 pound of 

 sulphate of copper in 2 gallons of hot water. When com- 

 pletely dissolved and the water has cooled, add 11 pints 

 of commercial ammonia (strength 22° Beaume). When 

 ready to use, dilute to 25 gallons. For treatment of downy 

 mildew and black-rot of the grape, anthracnose, and blight 

 and rot of the tomato and potato, and many other diseases. 

 2. Modified eau celeste. Dissolve 1 pound of sulphate of 

 copper in 2 gallons of water. In another vessel dissolve 1 



