504 THE SMALL GRAINS 



any tests. The chief advantage of this method over the 

 heating method is that it depends on no kind of heating 

 apparatus, and can be used in any mill large or small. 



549. Fumigation with carbon bisulfid. This method 

 is recommended as the simplest and least expensive 

 remedy for all insects ordinarily infesting the farmer's 

 grain and grain products stored in tight bins. In such 

 cases this method is also fairly effective. It is not an effec- 

 tive method, however, in flour mills, and in its use in 

 mills and in large grain elevators there is danger from fire. 



In buildings reasonably tight, and with a temperature 

 above 70, 4 pounds of carbon bisulfid are about suffi- 

 cient for each 1000 cubic feet of space, or 1 pound for 

 each 35 bushels of grain. If the building or bins are 

 not sufficiently tight for thorough fumigation, or if the 

 insects are very abundant, the quantity of the liquid 

 should be doubled or tripled. 



Since the vapor is heavier than air, and settles down- 

 ward, the liquid should be placed in shallow pans at the 

 top of the building or bins, and should be well distributed, 

 not more than a pound in a place. The fumigation should 

 be allowed to continue 36 hours, or even 48 hours, if the 

 grain is not to be germinated. It is a good plan to apply 

 the liquid Saturday afternoon, and leave the building 

 closed until the following Monday morning. The vapor 

 of the liquid being highly inflammable, no fire or light of 

 any kind should be allowed about the building during the 

 fumigation. 



