CARBON DISULPHID AS AN INSECTICIDE. 



Pago. 

 Insect pests vrhich may be killed by carbon 



disulphid, 3 



Form in which carbon disnlphid is sold, and 



what it costs 4 



Properties of carbon disulphid 4 



Effects upon human beings of iulialation of 



vapor 5 



Precautions to be observed in handling and 



storing 6 



Confinement of the gas in fumigation 7 



Diffusion of the vapor 8 



Effect of temperature in fumigation 9 



Aiding rapid vaporization 9 



How carbon disulphid kills 10 



Treatment for insects infesting stored grains, 



peas, etc 10 



Treatment of biiildings 12 



Page. 



Fumigation of sacked cotton seed 14 



Destruction of ants 14 



Use of carbon disulphid against white grubs 



and mole crickets 15 



Treatment for aphids living midergi-ound 10 



Treatment for root-maggots 17 



Treatment for aphids on low-growing plants . 18 



Destroying wood borers 19 



Treatment for clothes moths and for other 



household insects 19 



Destroying museum pests 20 



Species factor in insect resistance to carbon 



disulphid 20 



Effect of carbon-disulphid fumigation upon 



the germination of seeds 21 



Substitutes for carbon disulphid in fumiga- 

 tion work 21 



INSECT PESTS WHICH MAY BE KILLED BY CARBON DISULPHID. 



Carbon disulphid is a liquid which evaporates quickly when 

 exposed to the air, forming a heavy inflammable vapor having great 

 penetrative power so that it is very useful in destrojang insect pests. 

 This substance is used most extensively to kill weevils and other pests 

 that injure stored grains, beans, cowpeas, and peas, but it may be 

 employed with advantage to kill many other kinds of insects. These 

 may be arranged in three groups. In one group are species that live 

 underground on the roots of plants or that nest in the ground, as do 

 some aphids, the white grubs, mole ci^ickets, ants, and others; in the 

 second group are species that attack various stored products, such as 

 grain insects, pea weevils, bean weevils, pantry pests of various kinds, 

 and mill insects; and in the third group are species that can not be 

 controlled by the methods commonly employed for their near rela- 

 tives. In this last group belong certain other insects that can not be 

 combated satisfactorily by spraying and various wood borers that 

 can not be reached with poisons but can be reached easily with 

 vapors.^ 



1 It should be noted that the degree of infestation does not alTect the dosage required. 



3 



