280 Elementary Principles of Agriculture 



attempt to pour the milk of lime into the copper sulfate, 

 or the reverse, but pour together in equal quantities 

 into a third vessel. 



Success in preparing Bordeaux mixture of uniform 

 color and consistency will depend on the pureness 

 of the substances and the manner of mixing. When 

 properly prepared it has a sky-blue color. If the lime 

 is not fresh, a greenish color sometimes results, which 

 indicates that more lime is needed. It is advisable to 

 have an excess of lime. Where plants with delicate 

 foliage, like the peach, are to be sprayed, three times 

 as much lime as copper sulfate is used. 



Insecticides With Bordeaux Mixture. It is often de- 

 sirable to apply an insecticide at the same time a fungi- 

 cide is applied, in order to obviate the necessity of two 

 sprayings. This is often done when internal poisons, like 

 Paris Green, London Purple, or Arsenate of Lead, are 

 used. They may be added to the Bordeaux Mixture at the 

 rate of one-fourth pound to fifty gallons of Bordeaux. 



Lime and Sulfur Preparations are much used to 

 destroy scale insects. They act both as a fungicide and 

 an insecticide, though their use is advisable only during 

 the dormant season. The preparations in common use 

 vary somewhat in detail. The following is often used: 



Fresh lime 15 to 30 pounds 



Flowers of sulfur 15 " 



Common salt 10 " 



Water to make 50 gallons 



When the lime is perfectly fresh, the smaller quantity 

 named above will answer. 



To make the preparation, proceed as follows: Slake 

 the lime with hot water, adding the water slowly until 

 about ten gallons are used. Then add the sulfur and 



