PLANT ENEMIES 45 



copper sulphate in one gallon of water. A stock solution of quick- 

 lime is made by weighing out a definite quantity and slaking it with 

 a small quantity of water. After the lime is thoroughly slaked 

 and cooled, enough water is added to make a solution containing 

 one pound of lime per gallon of water. These solutions, if kept in 

 covered vessels to prevent evaporation, will remain good for a long 

 time. In preparing the Bordeaux mixture from stock, measure out 

 the proper quantity of your solution of copper sulphate and dilute 

 it with half the quantity of water needed. In a similar manner 

 measure the lime from stock, and dilute with the other half of the 

 water, but in separate vessels, and mix as outlined above." 



B. Ammoniacal Copper Carbonate. Dissolve 6 ounces oi 

 copper carbonate in about 3 pints of ammonia, but use no more 

 ammonia than is necessary for the solution. Add 50 gallons of 

 water. The solution without the water will keep some time if bottled 

 up. It does not discolor the foliage. It is effective against black 

 spot of Roses, leaf spots and some rusts. 



C. Potassium Sulphide. Use 3 ounces of potassium sul- 

 phide to 8 or 10 gallons of water. Good for mildews and rusts in 

 the greenhouse and out of doors for Gooseberry mildew. 



D. Sulphur, Powdered, or Flowers of Sulphur. Used with 

 a powder gun or placed in cheese-cloth bags and dusted on foliage 

 while dew is on the plants. In the greenhouse, a paste should be 

 made of sulphur and water with a quarter part of lime and smeared 

 on steam pipes. Effective against mildews, especially Rose mildew 

 and Asparagus rust. In Summer, in the greenhouse, when the 

 steam is not on, sulphur vaporizers are useful, but they must be 

 used carefully. 



E. Lime and Sulphur Solution. In making this spray at 

 home any amount may be made, using the standard proportions, 

 10 pounds of stone lime, 10 pounds of flowers of sulphur with enough 

 water to make 50 gallons of solution. Place the lime in a wooden 

 receptacle and add enough water to start the slaking, then add the 

 sulphur, stirring it in thoroughly. It is ready for use after adding 

 the required water. Commercial lime-sulphur solutions can be now 

 obtained which require no preparation except adding water. Lime 

 and sulphur is effective for a Winter spray controlling scale insects 

 and Peach-leaf curl; as a Summer spray for diseases of fruit. The 

 commercial preparations usually require 7 gallons of water for 

 each gallon of stock solution when used as a Winter spray, but 



