s 



CIRCULAR 269, U. S. DEPT. OF AGRICULTURE 



Table 2. — Data on development of Ephestia elutella from eggs laid on flue-cured 

 tobacco in the laboratory at Richmond. Vo... during August, 1931 





Date egg 

 was laid 



Incuba- 

 tion 

 period 



Larval 

 period 



Pupal 

 period 



Date 

 adult 



Sex 



Period from 



egg to adult 



Rearms Xo. 



Dura- 



Temperature ' 





emerged 





















tion 



Mean 

 maxi- 

 mum 



Mean 

 mini- 

 mum 



Mean 





Days 



Days 



Days 





Days 



° F. 



° F. 



° F. 



1 | Aug. 9 



4 



47 



13 



Oct. 12 Male 



64 



81.1 



71.9 



76.5 



2 



—do 



4 



53 



18 



Oct. 23 Female.— 



(0 



80.8 



69.1 



74.9 



3 



—do 



4 



53 



18 



-.do 



—do 



75 



80.8 



69.1 



74.9 



4 



Aus. 11 

 —do 



6 

 6 



35 

 41 



15 

 15 



Oct. 6 

 Oct. 12 



Male 



Female 



56 

 62 



80.8 

 80.8 



72.3 

 71.7 



76.5 





76.2 



6 



—do 



6 



40 



20 



Oct. 16 



Male 



66 



SO. 6 



70.8 



75.7 



7 



—do 



6 



44 



16 



—do 



—do 



66 



80.6 



70.8 



/O. / 



8 



—do 



6 



43 



17 



-_do 



--_do 



66 



80.6 



70. S 



75.7 



9 



--do 



6 



46 



15 



Oct. 17 



Female 



67 



SO. 6 



70.6 



75.6 



10 



_- do 



6 



46 



15 



...do 



—do 



67 



80.6 



70.6 



75.6 



11 



—do 



6 



44 



17 



--_do 



Male 



67 



80.6 



70.6 



75.6 



12 



--_do 



6 



47 



17 



Oct. 20 



Female 



70 



SO. 5 



69. 6 



75.0 



13 - 



—do 



6 



47 



17 



—do 



___do 



70 



80.5 



69.6 



75.0 



14 



—do 



6 



47 



18 



Oct. 21 



Male 



71 



80.6 



69.4 



75.0 



15 



—do 



6 



48 



17 



—do 



—do 



71 



80.6 



69.4 



75.0 



16 



Aug. 13 



5 



3S 



13 



Oct. S 



Female 



56 



81-2 



72.9 



77.0 



17 



—do 



5 



38 



13 



-_-do 



Male 



56 



81.2 



72.9 



77.0 



18 



--do 



5 



41 



16 



Oct. 14 Female.— 



62 



80.7 



71.1 



75.9 



19 



-_-C0 



5 



44 



16 



Oct. 17 



Male 



65 



80.7 



70.6 



75.6 



20 



—do 



5 



46 



14 



_--do 



Female 



65 



80.7 



70.6 



75.6 



21 



-_-do 



5 



45 



16 



Oct. IS 



—do 



66 



80.6 



70.3 



75.4 



22 ----- 



--do 



5 



46 



18 



Oct. 21 



—do 



69 



80.7 



69. 4 



75.0 



23 



—do 



5 



48 



IS 



Oct. 23 



Male 



71 



80.7 



68.9 



74.8 



24 



--do 



5 



54 



12 



.--do 



Female 



71 



80.7 



68.9 



74.8 



25 



--do 



5 



48 



IS 



--do 



—do 



71 



80.7 



68.9 



74.8 



26 



Aug. 14 

 Aug. 16 

 ___ do— - 



6 

 5 

 4 



43 



44 



:3 



18 

 IS 

 24 



Oct. 20 

 Oct. 22 

 Nov. 5 



Male 



---do 



—do 



67 

 C7 

 SI 



80.7 

 80.8 

 80.3 



69.6 

 68.9 

 66.3 



75.1 



9 7 



74.8 



2S 



73.3 



29 



Aug. 17 

 —do 



6 



5 



43 

 51 



17 

 24 



Oct. 22 

 Nov. 5 



Femal? 



__-do 



66 

 SO 



80.7 

 80.0 



68.8 

 66.2 



74.7 



30 



73.1 



Average 



5.3 



45.4 



16.7 



67.5 



















» The temperatures recorded in this table were obtained from hygrothermograph records in the labora- 

 tory, Richmond, Va. 



