132 The Fruit-Growers Guide-Book 



and can be mixed dry and sprinkled along the drills with 

 onion seed for the prevention of onion smut. In green- 

 house it is mixed with equal parts of lime and painted on 

 the heating pipes, where it is slowly evaporated for the 

 control of rose mildew. 



Formalin 



Formalin (40%), 1 pint. 

 Water, 30 to 50 gallons. 



For the treatment of potato scab the seed potatoes are 

 soaked for half an hour in the stronger solution. For oat 

 and wheat smut the weaker solution should be used at the 

 rate of about one gallon to each bushel of seed. The grain 

 for treatment should be poured out on a tight floor and 

 sprinkled with the solution. It should then be shoveled 

 over into a pile and thoroughly mixed up so that each 

 grain is coated with the solution.- Then cover it with a 

 canvas and allow to stand for a couple of hours before 

 spreading out to dry. 



Self-Boiled Lime-Sulphur 



This spray mixture is one of the newest fungicides, and 

 has proven especially effective in the control of peach scab 

 and brown rot. Prof. W. M. Scott of the United States 

 Department of Agriculture prepares this mixture as fol- 

 lows: 



Fresh stone lime, 8 pounds. 



Sulphur (either flowers or flour), 8 pounds. 



Water, 50 gallons. 



"In mild cases of peach scab and brown rot a weaker 

 mixture, containing 6 pounds of each ingredient to 50 gal- 

 lons of water, may be used with satisfactory results. The 

 mixture can best be prepared in rather large quantities- 

 say, enough for 200 gallons at a time, making the formula 

 32 pounds of lime and 32 pounds of sulphur, to be cooked 

 with a small quantity of water (8 or 10 gallons) and then 

 diluted to 200 gallons. 



