PESTS AND DISEASES OF PLANTS 227 



(a) Copper sulphate 5 pounds 



Stone lime 5 pounds 



Water 50 gallons 



The weaker solution is 



(b) Copper sulphate 3 pounds 



Stone lime 5 pounds 



Water 50 gallons 



If hydrate of lime is used add one-fourth more. 



To mix, dissolve the copper sulphate with water in proportion of one 

 pound of sulphate to sufficient water to make one gallon of solution for 

 each pound of sulphate used. The stone lime may be slaked and dissolved 

 in water in the same proportions as the sulphate. This gives convenient 

 stock solutions, every gallon of which contains one pound of lime or of 

 sulphate. To make the mixture from these stock solutions take, say, five 

 gallons of the lime solution which will contain five pounds of stone lime, 

 and five gallons of the sulphate solution which will contain five pounds of 

 copper sulphate. Five gallons of each of these two solutions may now be 

 mixed with water by pouring through a strainer into water sufficient to 

 make fifty gallons. Do not mix the solutions before pouring into the water. 



Bordeaux Paste. 



The latest and best cure for gum disease recommended by Mr. Fawcett : 



Blue stone 1 pound 



Fresh burned lime 2 pounds 



Dissolve the blue stone in one gallon water, using wooden or earthen 

 vessel by hanging it in the top of a sack ; slake the lime in about one-half 

 gallon of water. Stir together when cool, making a mixture about the con- 

 sistency of whitewash. Apply with a brush. This may also be applied to 

 healthy bark as a preventive against new infections. Mix fresh each day or 

 two, as mixed paste deteriorates rapidly. 



Ammoniacal Copper Carbonate. 



Copper carbonate 5 ounces 



Ammonia (26 Baume) 3 pints 



Water 50 gallons 



The strong ammonia, which must be handled carefully, may be diluted 

 to about five times its volume, and the copper carbonate may be rubbed 

 up with water in a small vessel to form a thin paste. Add this paste to the 

 dilute ammonia by constant stirring. Then add water sufficient to make 

 fifty gallons. Use as promptly as possible owing to rapid evaporation of 

 ammonia. 



Potassium Sulphide. 



Potassium sulphide 6 ounces 



Water 100 gallons 



This is employed when coloring of foliage is not desirable. 



