Appendix B 369 



water the dissolving process may be hastened. Use wooden tubs for 

 the copper sulfate. The fresh lime should be mixed with water in 

 another vessel, using only a small amount of water at first, adding 

 as the slacking progresses. Add water till a thin batter is formed. 

 Stir freely to destroy even small lumps. Add more water and 

 strain through a burlap sack. Dilute the milk of lime to about 

 25 gallons, and likewise the copper sulfate. Mix by pouring in 

 equal quantities of each into a third vessel, as suggested by Fig. 230. 

 Success in preparing Bordeaux mixture of uniform quality, 

 color, and consistency will depend on the materials 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. When peaches and other plants with delicate foliage are 

 to be sprayed, three times as much lime as copper sulfate is used. 



4. Ammoniacal Copper Carbonate Solution is used some- 

 times in spraying ornamentals or for the last spraying of grapes, 

 when the Bordeaux mixture would be objectionable. 



Copper carbonate 5 ounces 



Strong ammonia (26 Baume') 2 to 3 pints 



Water 50 gallons 



5. Insecticides With Bordeaux Mixture. It is often desirable 

 to combine an insecticide with a fungicide in order to obviate the 

 necessity of making two sprayings. This is often done when 

 internal poisons, like arsenate of lead, Paris Green, London Purple, 

 are used. They may be added to the Bordeaux mixture at the rate 

 indicated by the formula usual for insecticides. 



6. Lime and Sulfur Preparations are much used to destroy 

 scale insects. They act as a mild fungicide also. The preparations 

 in common use vary as to the proportions of lime and sulfur. 



7. Fire-Boiled Lime-Sulfur Wash. Use the following: 



Fresh lime 15 to 30 pounds 



Flowers of sulfur 15 pounds 



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 iime with hot water, adding the water slowly until about 

 ten gallons are used. Then add the sifted sulfur and stir until 

 thoroughly mixed. Boil this mixture for from forty-five to sixty 



