New Yoke: Agricultural Experiment Station. 781 



of potatoes per cubic foot or 167 bushels per 1,000 cubic feet. With 

 smaller quantities the tubers are liable to be injured by the treatment; 

 while with larger quantities the treatment may not be effective. If 

 necessary to treat smaller quantities than ten pounds per cubic foot it 

 is suggested that a smaller room be fitted up for a fumigator if pos- 

 sible, or that the quantity of chemicals be reduced proportionately. 

 No tubers should be placed directly above the generator. If pos- 

 sible, the treatment should be made before the tubers have begun 

 to sprout as sprouted tubers are more liable to injury. The tem- 

 perature of the chemicals at time of mixing should be above 50° Fahr. 



Formaldehyde solution. — Mix one pint of 40-per-ct. formaldehyde 

 solution with 30 gallons of water. Soak the uncut tubers in this 

 solution for two hours. The same solution may be used repeatedly. 

 Treated tubers not required for planting may be used for food or 

 fed to animals with perfect safety. 



Corrosive sublimate solution. — Prepare a solution containing 2 

 ounces of corrosive sublimate in 15 gallons of water. This is 

 best done by first dissolving the corrosive sublimate in a small 

 quantity of hot water and afterward diluting to the required amount. 

 Soak the uncut tubers in this solution 1| hours. Recent investiga- 

 tions by Gussow and Shutt in Canada indicate that the strength 

 of corrosive sublimate solution decreases so rapidly with use that 

 it is necessary to reject it after using three or four times. As the 

 solution corrodes metals it should be used only in wooden or stone 

 vessels. These should be kept away from animals until very thor- 

 oughly cleansed from the solution. It is very poisonous. All 

 treated tubers should be either planted or buried. 



With any of the scab treatments care should be taken that treated 

 tubers are not reinfected by coming in contact with bags or crates 

 which have held scabby potatoes. 



