CODLING MOTH IN NORTHWESTERN PENNSYLVANIA. 



87 



FIRST-BROOD MOTHS. 



Time of emergence. — On August 2 the earliest first-brood moths 

 emerged from band material collected July 13. As shown in figure 

 20 and Table XXI, the moths gradually increased in number, reach- 



5 16 17 18 II 20 21 22 fb 24 25 2fc 27 26 £1 JO 31 SEPT 1 3 "t 5 



Fig. 20.— Emergence curve showing first-brood moths, in 1909, at North East, Pa. (Original.) 



ing a maximum on August 26, at which time moths suddenly de- 

 creased, emergence ceasing altogether about September 3. 



Table XXI. — Emergence of moths of the first brood. Material from banded trees. 



Date of 

 emergence. 



Number 

 of moths. 



Date of 

 emergence. 



Number 

 of moths. 



Date of 



emergence. 



Number 

 of moths. 



Date of 



emergence. 



Number 

 ofmoths. 



Aug. 2 

 Aug. 3 



Aug. 4 

 Aug. 5 

 Aug. 6 

 Aug. 7 

 Aug. 8 

 Aug. 9 

 Aug. 10 



4 

 8 

 4 

 8 

 3 

 7 

 5 

 7 

 3 



Aug. 11 

 Aug. 12 

 Aug. 13 

 Aug. 14 

 Aug. 15 

 Aug. 16 

 Aug. 17 

 Aug. 18 

 Aug. 19 



7 

 7 

 10 

 13 

 14 

 7 

 5 

 6 

 10 



Aug. 20 

 Aug. 21 

 Aug. 22 

 Aug. 23 

 Aug. 24 

 Aug. 25 

 Aug. 26 

 Aug. 27 



18 



9 



8 



15 



5 



13 



22 



15 



Aug. 28 

 Aug. 29 

 Aug. 30 

 Aug. 31 

 Sept. 2 

 Sept. 3 



14 

 12 

 10 

 5 

 1 

 1 



276 



It is of interest to note that the rate of emergence of the spring- 

 brood moths is almost the reverse of the rate of emergence of the 

 first-brood moths. In the spring, shortly after the appearance of the 

 first moths, the maximum is attained within about a week, while the 

 decrease in the number of moths is more gradual and extends over a 

 longer period. 



Oviposition period. — For oviposition records moths of this brood 

 were confined in rearing jars, as has already been described for the 

 spring brood of moths (p. 77) . As shown in Table XXIV, the observa- 

 tions include twenty-six separate jars, in which the number of moths 

 varied from 3 to 17 for each jar. In five of the jars no eggs were 



30490°— Bull. 80—12 7 



