CONTROLLING CIGARETTE BEETLE IN STORED TOBACCO J 



The temperature of the center of the bale of Connecticut shade 

 wrapper fell from 64° to 15° F. in 3% days. The outer reading in 

 the same bale fell to 15° in 2% days. The temperature at the center 

 of the bale of Florida wrapper fell to 15° in 4y 2 days, that of the 

 Wisconsin filler in 5y 2 days (not shown in figure 2), and that of the 

 Puerto Rican long filler in 5 days. Fifteen days' exposure was re- 

 quired to bring the temperature of the center of the hogshead down 

 to 15°, and 10 days was required for the point 6 inches from the 

 outside. 



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CENTER OF BALE 



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DAYS 



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-Rate of cooling of the tobacco at the center and 6 inches from the outside of 

 a hogshead when placed in a cold room at 10° F. 



TREATMENT OF INFESTED BALES 



Knowing the time required to kill exposed insects and the rate of 

 cooling of bales and hogsheads, it is possible to estimate the exposure 

 required to control all stages of the insect in normally infested bales. 

 This was checked experimentally by exposing bales artificially in- 

 fested with different stages of the insect, since no bales known to 

 have sufficient infestation could be readily obtained, A supply of 

 hollow spikes were constructed into which a number of insects could 

 be placed and thrust into the tobacco to any required depth. These 

 spikes were three-eighths of an inch in diameter and 22 inches long, 

 18 inches of the length being a maple handle. The remaining 4 

 inches was a hollow brass tubing perforated with small holes and 

 headed up with a brass point which could be unscrewed to allow 



