INDUSTRIAL FUMIGATION AGAINST INSECTS 6 



GENERAL MILL OR WAREHOUSE FUMIGATION 



All mills, factories, warehouses, and storage rooms in which ma- 

 terial subject to insect attack is handled become infested at one time 

 or another and need a general fumigation. The managers of many 

 such places realize the importance of maintaining a clean plant and 

 fumigate one or more times a year as a general practice. Others, 

 fearing the trouble and expense, wait until conditions become so 

 bad that they are forced to shut down their mills for a thorough 

 cleaning and fumigation. 



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

 tion, as with simple equipment and under the supervision of an ex- 





: 





Figure 2. — A battery of three modern steel fumigation vaults, each about 6 by 

 8 by 10 feet, equipped with apparatus for introducing and withdrawing the 

 fumigant, and for heating and circulating the air within. Such vaults are 

 used for treatment of various commodities, in this instance furs, and not 

 ordinarily for continuous storage. 



perienced man 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 

 fumigant 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. 

 All machinery or special pieces of apparatus must be cleaned and 

 opened up to allow maximum penetration of the gas. 



