CTTAPTT'K WIT 

 FiMUiAN rs 



In ^ouoral. fumipition is available iov killini!; insorts only wlion tl\i^ 

 plants or substauoes tivatod are in an inolosoii space. This is for the 

 reason tl\at the various gases whieh are the active killinj2; auients in 

 any fmniiiation nuist be eontined to be elTeetive. 



Funiigatiou is eoninionly used in ii;reen houses, in the treatment of 

 pests infestinu; stored or niantifaetured products, and in the treatment 

 of nursery stock suspected of infestation with San Joso scale. The 

 methods employed and the streni2;ths of material used vary with these 

 ditYerent classes of work. The iivneral manner of using the chemicals, 

 and the principles involved, are similar. 



Carbon Bisulphide 

 Carbon bisulphide . . 1 ])ound to each 100 cubic feet 



This is the material ordinarily used for killiuii; pests of stored and 

 manufactured products, except in grain elevators where the risk of 

 accidental tire is considered too great. It is a cU\ir, lu\ivv licjuid, 

 with a strong and disagreeable odor. On exposure to air, it evapo- 

 rates rapidly, giving otT a gas that is heavier than air, and therefore 

 diffuses down rather than up. 



Allow 1 pound of carbon bisulphide for each 100 cubic feet of 

 space in the fumigating chamber. Or, if grain is being fumigated, 

 allow 1 ]Hnmd of the liiiuid to each 100 bushels oi grain. In small 

 quantities this is about equivalent to 2 drams to the bushel. 



This is the dosage at ordinary temperatures t)f ()0° to 70° Fahren- 

 heit. At nuich lower temperatiu-es a heavier dose will be reciuired, 



80 



