CODLIN^G MOTH IN CENTEAL APPALACHIAlSr EEGION. 



25 



Table XVIII. — Emergence of spring-brood moths of the codling moth at 

 Winchester, Va., in 1913. (See fig. 14.) 



Date of obser- 

 vation. 



Number 

 of moths 

 emerging. 



Date' of obser- 

 vation. 



Number 

 of moths 

 emerging. 



May 6 



18 

 38 



6 

 16 

 30 

 29 



8 



16 

 14 



June 2 



14 

 10 

 6 

 3 

 7 

 3 

 1 



9 



5 



12 



8 



15 



11 



18 



14 



21 



24 



27 



30 



17 



20 



Total 



219 



Moths continued to issue in the rearing cages until June 20. The 

 irregalarity of the emergence curve in figTire 14 is due in most cases 



— 65 

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 55 



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 AUGUST 



Fig. 14.— Diagram to illustrate emergence of spring-brood and first-brood moths of the codling moth 

 at Winchester, Va., in 1913. 



to jQiuctuations in temperature. The first moth emergence m con- 

 finement occurred 16 days earlier in 1913 than in 1912, but since 

 adults were probably appearing in the field in 1912 not later than 

 May 15, we may assume that spring-brood emergence began in the 

 field only 10 to 12 days earlier in 1913. 



The seasonal appearance of the two broods of moths can perhaps 

 bo best uppr(5ciatod by referring to figure 14. The emergence of 326 

 inotliH of the first brood arc given in Table XIX. The fijst adults 

 of this brood appeared in the laboratory in 1913 on Juno 30, nine 

 days earlier tliun in 1912. However, not until July 5 to 8 did adults 

 appear in any numbers, and in reality the difTorenco in the time of 

 appearance of summer, or first-brood, moths in the two seasons is 



77013"— BuU. 189 16 1 



