358 GREENHOUSE MANAGEMENT. 



plants. If the attack is widespread, and if the fungus 

 is a difficult one to destroy, upon all plants where a 

 thick coating of lime will not be objectionable the fol- 

 lowing mixture may be used: Four pounds of copper 

 sulphate, three pounds of lime, forty gallons of water. 

 Dissolve the copper sulphate in hot water (it can readily 

 be done by placing it in a piece of burlap and suspend- 

 ing in a pail of water), and in another vessel slake the 

 lime (also with hot water), pour together, and add the 

 remainder of the water. This mixture should be 

 strained, in order to remove all lumps that might clog 

 the pump. It is well to test the mixture by adding a 

 few drops of solution of ferrocyanide of potassium. If 

 it turns the mixture brown, more lime should be added. 



For the powdery mildews, and upon plants where 

 the lime is not desirable, the mixture may be made half 

 as strong as above, using two pounds of copper sulphate, 

 two pounds of lime and forty gallons of water. The 

 fungicide should be applied in a fine spray, covering 

 every part of the plants. Except in cases where the dis- 

 ease has a firm foothold, the weaker mixture will 

 generally answer. 



For use when the lime mixtures are not desirable, 

 the modified eau celeste, or the ammoniated copper car- 

 bonate, may be used: The former is made from 2 pounds 

 copper sulphate, 1 1-2 pounds sal soda, 1 1-2 quarts 

 ammonia water (FFFF), 32 gallons of water. 



Dissolve the copper sulphate and sal soda in sepa- 

 rate vessels, pour together and, when action has ceased, 

 add the ammonia and dilute before using. 



The ammonia solution of copper carbonate, or 

 cupram, as it is called for short, is made by dissolving two 

 ounces of precipitated copper carbonate in one quart of 

 ammonia (FFFF), and diluting to thirty-two gallons- 

 The last two preparations form clear, dark blue solu- 

 tions and, although less effective than the Bordeaux 



