"INSECT "-CONTROL," IN FLOUR" MILLS. 



9 



be taken into the main mill building before they are thoroughly 

 disinfected. It has already been stated that in the majority of cases 

 the spread of moths from mill to mill is traceable directly to the use 

 of untreated secondhand sacks. Such sacks should be stored in a 



) 



Fig. 5. — View in basement of flour mill. Note accumulations of webbed flour on floor, 

 on bundles of twine, clinging to brick walls, and banging from overhead beams. The 

 flour in the foreground on floor is badly webbed. Such conditions are not allowed to 

 exist where control measures are put into successful operation. 



small, tightly constructed house separated from, any part of the 

 mill, and there treated either by heat or fumigation. This may in- 

 volve extra handling but should become a part of the routine of 

 protection against pests. 



183545°— 20 2 



