148 



Five applications wei'e made in each case : 



1. Potassium sulphide, 1 oz. dissolved in three gallons of water, gave the best 

 results, keeping the foliage practically healthy and free from disease during the whole 

 season. 



2. Potassium sulphide, 1 oz. to four gallons; stood second in order of effective- 

 ness. 



3. Ammoniacal copper carbonate, 3 oz. to twenty-five gallons; stood third; 

 fairly effective. 



4. Suspension mixtures of copper carbonate did not give a sufficient degree of 

 immunity to pay for cost of materials and time of application. 



