SCHOOL AND HOME GARDENING 



gallons of water. The extra lime is omitted if Bordeaux 

 is used in place of water. When Paris green is used dry, one 

 pound of it may be mixed with twenty pounds of powdered 

 lime. This is used on plants when the leaves are moist with 



dew. 



4. Making Bordeaux Mixture.— Slake a pound of lump lime, 



as described in another exercise. Add enough water to make five 



gallons. Dissolve a pound 

 of c o p p er sulfate (blue 

 stone). This can be done by 

 pouring hot water over it 

 and stirring continuously for 

 a few minutes. When hot 

 water is' not available the 

 sulfate may be suspended in 

 water by" means of a cloth. 

 This should be done the day 

 before, as several hours are 

 required. Add water to this 

 solution to make up five gal- 

 lons. When the Bordeaux 

 mixture is wanted these two 

 solutions should be poured 

 together into a third vessel. 

 The two should be poured at 

 the same time; letting the 

 stream of one meet the 

 stream of the other in the air 

 as they descend into the 



Fia. 149. — The grain smut disease re- 

 duces the yield as shown on oats at the left. 

 (Agriculture and Life.) 



third vessel. Two persons can do this mixing better than one. The 

 resulting mixture is of an intense blue color, but lighter in shade 

 than the sulfate crystals. 



Bordeaux mixture is named from a town in France where 

 the first experiments were tried with it. It should never be 

 mixed until required for spraying, as it will not keep. The 

 lime and sulfate may be dissolved separately and kept in stock 

 solutions. It is a fungicide and not an insecticide when uSed 

 alone. As a fungicide it should be applied as a spray before 

 the disease starts on the plants. The above mixture would 



