90 
Colorado Experimp:nt Station 
FORMALDEHYDE TREATMENT FOR SEED POTATOES 
Soak the seed tubers in formaldehyde solution (1 pint to 30 gal- 
lons) for two hours. Either metal or wooden containers may be 
used. The same solution may be used several times provided it is 
not left uncovered for any length of time. Pour off the solution and 
permit the tubers to dry. All containers used to handle the seed after 
treatment should first be disinfected with the formaldehyde solution. 
The tubers should be treated before cutting unless they are to be 
planted immediately. Potatoes treated with formaldehyde may 
safely be fed to stock if thoroughly washed. 
CORROSIVE SUBLIMATE (Poison) 
This is a fungicide used chiefly for disinfection of seed potatoes. 
Four ounces of corrosive sublimate to 30 gallons of water is the usual 
formula. Dissolve the corrosive sublimate in a gallon or two of 
hot water and then dilute to 30 gallons. Soak the tubers in this 
solution for one and one-half hours. Metal containers should never 
be used. Corrosive sublimate is a violent poison and should be 
carefully handled. Potatoes treated with this solution should not 
be fed to stock. 
HOT WATER TREATMENT FOR CONTROL OF LOOSE SMUTS 
OF WHEAT AND BARLEY 
Apparatus 
1. One accurate and reliable thermometer. 
2. Three large barrels, tanks or vats. 
3. Several good strong gunny sacks (not canvas). 
4. One large boiler in which to heat water. 
5. One sprinkling can. 
Procedure 
1. Heat water in boiler to almost boiling temperature. Pour this 
into one of the large barrels, tanks or vats and refill boiler. Add 
cold water and stir with vigor until the temperature is exactly 
86 degrees F. 
2. Fill the gunny sacks about three-fourths full of grain and tie 
loosely. Immerse the sacks in the water at 86 degrees F., move up 
and down several times to expel the air and leave immersed toi* 
four hours. 
3. After four hours, pour into the second barrel or vat a (luantity 
of nearly boiling water and cool it down by slowly adding cold 
water with constant stirring until the temperature is exactly 112 
degrees F. Refill the heating boiler. Immerse the grain that has 
