FUMIGATING SUBSTANCES 27 



FUMIGATING SUBSTANCES 



Several substances are used to fumigate mills, 

 greenhouses and dwellings in order to destroy the 

 insects that may be infesting such buildings. 



Carbon bisulphide ^^ — This liquid is used as a 

 fumigant against stored grain insects especially and 

 sometimes against root-feeding insects, aphids, 

 white grubs, ants, etc. 



It is heavier than water; readily volatile; and 

 wdien pure it has not an unpleasant odor. The gas 

 from the liquid is heavier than air and is suffocat- 

 ing. The gas is also inflammable and explosive. 



Use 2 pounds of the liquid ^^ to 1000 cubic feet 

 of space when temperature is between 65 and 75 

 degrees F. Granary must be tight. Peas, beans, 

 seed corn, etc., can be stored in barrels and treated. 

 Under ordinary granary conditions, 15 to 20 

 pounds to 1000 cu. ft. should be used. 



A cheap form of carbon bisulphide under the 

 trade name 'Tuma," is sold by Edward R. Taylor, 

 Penn Yan, N. Y. 



Hydrocyanic acid gas — It is a very poisonous 

 gas used against household insects, citrus pests, 

 stored grain insects, and for the fumigation of 

 nursery stock. 



Formula for household fumigation for 100 cubic 

 feet space: 



Water 3 fluid ozs. 



Sulphuric acid . . . .1 i fluid oz. 



% potassium cyanide i oz. 



wSodium cyanide has almost supplanted potassium 

 cyanide for fumigation purposes and should be 

 used according to the following formula for each 

 100 cubic feet of space: 



56 Hinds— U. S. Dept. Agr., Par's' Bull. 145. 



57 Chittenden and others— U. S. Bu. Ent., Bull. 96, Part III. 



