28 



The Philippine Journal of Science 



191S 



the beetles from entering freely and it will give just as satis- 

 factory results as the open mandala. 



Tobacco stored in warehouses (Plate VII, fig. 1) and in gen- 

 eral work rooms (Plate VII, fig. 2) furnishes a fresh supply of 

 beetles at all times. Bales of infested tobacco should not be 

 stored in the factory itself. 



TRAPS 



During the period of my study of the cigarette beetle, the 

 manager of the Germinal cigar factory carried on light-trap ex- 

 periments, placing a basin of petroleum under an electric light. 

 This produced results far from satisfactory, no more than 5 to 8 

 beetles being caught in a single night, although the factory was 

 badly infested at all times. I have found the most effective 

 trap to be leaf tobacco itself. Several manos of leaf tobacco 

 (Plate VIII, fig. 1) were placed in various parts of a warehouse. 

 After a period of from twelve to twenty hours these were 

 examined and the number of trapped beetles recorded. 



Table XIX. — Effectiveness of leaf tobacco as a trap for the cigarette beetle. 



Number 



of 

 manos. 



Length 

 of time 

 exposed. 



Where exposed. 



Number 



of 

 adults. 



Condition 



of 



manos. 



5 

 5 

 10 

 10 

 10 

 10 

 5 

 10 

 16 

 20 



Hours. 

 12 

 12 

 16 

 12 

 12 

 20 

 18 

 18 

 18 

 20 





155 

 255 



28 

 272 

 310 

 461 



32 



557 



640 



1,006 



Open. 

 Closed. 



Do. 

 Open. 

 Closed. 



Do. 



Do. 

 Open. 

 Closed. 



Do. 



do 







do 



do 





On bales of tobacco 



do 



do- 





From Table XIX it will be seen that a great number of the 

 adults may be trapped by this method. By carefully placing 

 the trap manos in a fumigating box and by using one of the 

 fumigants already suggested, the trapped beetles can be readily 

 destroyed. Tobacco in manos can be used to good advantage 

 as a trap in the general work room if, after working hours, all 

 other tobacco be removed and these manos placed in various 

 parts of the room. Before work is begun the following day, 

 the manos should be collected and fumigated or the beetles shaken 

 out into a pan of water and petroleum. Care must be exercised 

 when collecting them not to jar the beetles from the tobacco. 



