CODLING MOTH IN CENTRAL APPALACHIAN REGION. 



25 



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

 Winchester, Va., in 1918. (See fig. 14.) 



Date of obser- 

 vation. 



Number 



of moths 

 emerging. 



Date of obser- 

 vation. 



Number 

 of mollis 

 emerging. 



May (> 



is 

 38 



6 

 16 

 30 

 29 



8 

 16 

 14 





n 

 10 



6 

 3 

 7 

 3 

 1 



9... 





12 



8 .. 



15 



11 



18 



14 



21 



17 



2-1 



20 



27. . 



Total 



30... 



219 





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

 irregularity of the emergence curve in figure 14 is due in most cases 



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Af/4V JUNE JULY AUGUST 



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

 at Winchester, Va., in 1913. 



to fluctuations in temperature. The first moth emergence in 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 

 be best appreciated by referring to figure 14. The emergence of 326 

 moths of the first brood are given in Table XIX. The first adults 

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

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

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

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



77013°— Bull. 189 15 i 



