- 6 - 
In cases stored at -10° F. only 1 day was required for the tobacco 
temperature at a depth of 5 inches to fall to 0° F., or compared with 
more than 3 days at 10 inches and more than 5 days at 15 inches. 
The mortality of the insects depended upon the circulation of air in 
the storages and upon the moisture condition of the tcbacco. Exposure 
to -10° F. in circulated air was more effective than exposure to -20° 
in still air. For tobacco of medium order a 3 -day exposure to -10 
with the air circulated was as effective as fumigation in an atmospheric 
chamber. For soft tobacco an exposure of 4 to 5 days was necessary. 
Literature Cited 
(1) Swingle, M. C. 
1938. Low temperature as a possible means of controlling the 
cigarette beetle in stored tobacco. U.S. Dept. Agr. 
Cir. 462, 8 pp. 
