CIRCULAR 356, U. S. DEPT. OF AGRICULTURE 



Figure I.— Open-storage tobacco warehouse. The walls are constructed of sheet metal, roof of asphalt 

 and gravel, and floor of wood. This type of warehouse cannot be fumigated effectively. 



Figure 2. — The suction light trap, showing the reflector, barrel, wire cone, and glass jar. The motor is 

 attached to a crossbar in the barrel, as indicated by the wiring. The 1-quart jar has a capacity of ap- 

 proximately 300,000 cigarette beetles. 



