280 DISEASES OF TROPICAL PLANTS CH . 



STEEPS 



Formalin for Oat Smut and Stinking Smut of Wheat. 

 Put one half-pound of formalin in thirty gallons of 

 water. Immerse the grain for two hours and then 

 spread out to dry. The solution may also be sprinkled 

 on the grain, which is then piled up and covered for 

 two hours, after which it is spread out to dry. This 

 is only successful against those species of smut in 

 which the spores cling to the seeds. It is not suc- 

 cessful against corn smut, nor against the loose smut 

 of wheat. 



Formalin for Potato Scab. Put one half-pound of 

 formalin in fifteen gallons of water, and immerse the 

 tubers for two hours. Cut and plant in the usual manner. 



Hot Water for Smuts. This treatment can be used 

 for the same species of smuts as the formalin treatment. 

 Provide two large vessels with warm water, one at a 

 temperature of 110 to 120 F., and the other 132 to 

 133 F. These are to be used for dipping the grain. 

 Also provide extra vessels of hot and cold water, to be 

 added to the first two when necessary to maintain 

 the correct temperature. Put the grain in a closely- 

 woven basket or wire cage or loose woven bag, and dip 

 in the first vessel (110 to 120 F.) until thoroughly wet, 

 then dip in the other, and lift out about six or eight 

 times in the course of ten minutes. Spread the grain 

 out to dry. The operator should be careful to keep the 

 water at the required temperature ; use a vessel that 

 will hold six or eight times (by volume) as much water 

 as seed to be dipped at any one time ; and also be 

 careful that the basket or bag is not entirely filled 

 for dipping. 



Corrosive Sublimate for Potato Scab. 



Corrosive sublimate . . 2 oz. 

 Water . . . . .15 gallons. 



Dissolve the corrosive sublimate in a small amount 

 of water, using a wooden vessel. Then add the entire 



