INDUSTRIAL FUMIGATION AGAINST INSECTS 5 



There is no reason why fumigation should be an expensive opera- 

 tion, for with a simple equipment a few intelligent workers can be 

 quickly trained to fumigate most places with no more expense than 

 their time and the bare cost of the materials. 



REQUIREMENTS FOR A SUCCESSFUL FUMIGATION 



Success in the fumigation of any large building or enclosure de- 

 pends upon the proper planning and execution of the work, the care- 

 ful preparation of the building, and the correct choice of the fumi- 

 gant and time of its application. The building must be made as 

 nearly gastight as possible in order to avoid waste of gas and to 

 retain a lethal concentration of the fumigant as long as possible. 



Figure 0. — While industry in general has not found it feasible to promote insect 

 sanitation by introducing' a fumigant into the shipping unit as it moves tnrough the 

 packing machinery, this is a method that has been satisfactorily employed. The 

 furrrigant. in liquid form, is automatically introduced in each container just previous 

 to the entry of the commodity and the sealing of the container. 



All machinery or special pieces of apparatus must be cleaned and 

 opened up to allow maximum penetration of the gas. 



The temperature must be high enough to render the insects sus- 

 ceptible to the fumigant and to allow for its most efficient action. 



The fumigant must be suitable for the building in which it is 

 used and for the contents of the building. The quantity must be 

 great enough to allow for the loss through poor construction of the 

 building, absorption by the contents of the building, and adverse 

 weather conditions. The fumigant must also be properly applied 

 and distributed. The exposure must be long enough to permit maxi- 

 mum penetration and killing- effect. 



Precautions must be taken to see that all persons are out of the 

 building before the fumigation is started, and are kept out during 

 the fumigation and thereafter until the building has been properly 

 ventilated and declared safe to enter. Arrangements should be made 

 for quickly ventilating the building at the end of the fumigation. 



