vni. V. 1 



Jones: The Cigarette Beetle 



25 



can be obtained. Proper receptacles for the cigars, together 

 with as dry an atmosphere as possible, are necessary. Care 

 must be taken to avoid mold which appears within a very short 

 time on damp cigars. A zinc-lined box with rubber packing 

 for the lid was found most satisfactory in the cold storage ex- 

 periments. Cigars packed in wooden boxes contracted mois- 

 ture and became more or less wet when taken out of cold storage. 



It would undoubtedly be out of the question to install, in the 

 various factories, cold storage plants of sufficient capacity and 

 efficiency to give the proper degree of temperature for killing 

 the cigarette beetle, but in places, such as Manila, where such 

 a plant already exists, good results can be obtained by subjecting 

 the manufactured product to cold for a given period of time. In 

 the experiments to test the efficiency of cold storage, no attempt 

 was made to determine the exact degree at which the insect is 

 killed, and only those temperatures available at the Insular cold 

 storage plant were used. 



Four thousand Londres and 4,000 Coronitas cigars, packed in 

 a tin-lined box, were placed in cold storage for eight weeks. 

 Upon removal they had not molded, and were in good condition, 

 while 1,000 other cigars placed in wooden boxes had absorbed 

 moisture to such an extent that they had to be dried out again. 



The following table is a summary of the results of cold storage 

 upon the beetle in its different stages at the lowest temperatures 

 available at the Insular cold storage plant. 



Table XV. — Effect of cold storage at 7°.8 C. upon the cigarette beetle 



in its different stages. 



Stage of insect. 



Length 



of 



exposure. 



Number 

 of indi- 

 viduals 

 exposed. 



Number 

 killed. 



Remarks. 



EsKs 



Days. 

 li 

 2 



3 



4 



5 to 25 



5 



7 

 7 

 3 



6 



6 

 5 



68 



14 



1,271 



66 

 40 



187 



86 



150 



50 



4 

 E 



68 



14 



1,271 



66 

 40 



187 



86 



150 



60 



Two hatched, slightly retarded. 



Daily observations were kept on these. None 

 hatched. Eggs were left in cold storage 

 from 1.5 to 25 days. Check on these eggs 

 (50) aU hatched. 



TiSrvas whitish, but turned black soon after 

 removal. 



Pupse all dead. 



Some laid a few eggs in cold storage. None 



hatched. 

 Some laid eggs in cold storage; none hatched. 



Do 



Do 



Do. 



Do 



Larvae. . 



Do. . . . 



Do 



Pupse . -. 



Adults 



Do... 





