New York Agricultural Experiment Station. 333 



length of time. Repeat the operation, after which drain and dry the 

 bhie powder, which is copper carbonate." 



Potassium Sulphide Solution. 



Potassium sulphide i ounce. 



Water 2 gallons. 



This solution loses strength by standing and must be used imme- 

 diately. The potassium sulphide should be kept in a well-stoppered 

 bottle. Valuable in fighting mildew, especially the gooseberry mil- 

 dew. 



Iron Sulphate and Sulphuric Acid Solution. 



Iron sulphate (copperas) no pounds. 



Sulphuric acid i quart. 



Plot water 26 gallons. 



Add the acid to the copperas and pour on the water. Use when 



fresh. To be used only as a wash before the buds swell, applied with 



a brush or sponge. Chiefly valuable for grape anthracnose. Very 



caustic. Care should be used not to get it on the hands or clothes. 



Wear rubber gloves when applying it. 



Formalin Solution. 

 For potato scab: 



Formalin i pint ( i pound) . 



Water ,. 30 gallons. 



Soak the seed potatoes in the liquid for about two hours. 



I'or grain smut: 



Formalin i pint ( i pound) . 



Water 50 gallons. 



Thoroughly sprinkle the grain, stirring during the process. Leave 

 it in piles for several hours. 



Corrosive Sublimate Solution. 



Corrosive sublimate I ounce. 



Water 7 gallons. 



For potato scab. Soak seed potatoes lYz hours. This should be 

 done several weeks before planting. This treatment is now generally 

 supplanted by the formalin treatment. 



