^53 



Bordeaux Mixture. 



As commouly applied, it is formed of six pounds of cop- 

 per sulphate (bluestone) and four to six pounds of quick 

 lime dissolved in fifty gallons of water. The bluestone 

 should be dissolved as in the preceding formula. The 

 mixture must be thoroughly stirred while using. 



Ammoniacal Carbonate of Copper. 



This is made by dissolving four ounces of carbonate of 

 copper in two quarts of ammonia and adding the solution, 

 to fifty gallons of water. 



Copper Acetate. 



Dissolve four ounces of copper acetate in fifty gallons of 

 water. 



Combination of Insecticides and Fungicides. 



Four ounces of Paris green or London purple may be 

 added to fift}' gallons of Bordeaux mixture when it is desir- 

 able to spray for both fungi and insect pests. 



Method of Application. 



A large number of forms of spraying apparatus are on 

 the market and the amount of work of this kind to be done 

 and the kind of plants to be sprayed will determine the 

 character of the apparatus to be used. A nozzle that pro- 

 duces a fine mist-like spray is always desirable and in some 

 cases a necessity. 



DISEASES OF CULTIVATED PLANTS. 



COKN. 



Fortunately this great staple suffers from comparatively 

 few fungous diseases. The only one to be mentioned here 

 is the smut (Ustilago maydis). The appearance of this dis- 



