14 circular 8 6 9, u. s. department of agriculture 



Covering of Bulks 



Covering tlie bulks of tobacco with a good grade of plant-bed cloth 

 free from holes gives a certain amount of protection, if the bulks are 

 complete!}' covered and the cloth is tucked in around the bottom. 

 However, every 4 or 5 days during warm weather the cloth should be 

 removed carefully and placed in boiling water to destroy any eggs 

 laid on it. 



CONTROL IN STORAGE WAREHOUSES 



Insect Traps 



To provide an index of infestation and a guide for timing control 

 measures, suction light traps should be installed in all storage ware- 

 houses and operated continuously from early spring until late fall. 



Such a trap (fig. 8) consists of a barrel, a flange of sheet metal, and 

 a cone of 20-mesh bronze, brass, or stainless-steel screen wire. To the 

 small end of the cone is soldered the rim of a fruit- jar lid, and into 

 this lid is screwed a glass jar of suitable size. A 40-watt light (stronger 

 bulbs are less effective) is suspended from the front of the flange. A 

 fan operated by a small electric motor in the barrel of the trap provides 

 suction. The motor is usually of % horsepower or less, so that the 

 fan and light combined consume less than 1 kilowatt of electricity 

 in 24 hours. 



Figure 8. — Examining the catch from a suction light trap. 



