THE CODLING MOTH IN MICHIGAN. 



8 



The second generation includes: 

 The second brood of eggs; 



The second brood oflarvse, all or only a part of which may whiter ; 

 The second brood of pupse, of which a part may transform the 

 same season ("fall pupae"), and a part or all the following 

 spring ("spring pupae"). 

 The third generation includes: 

 The third brood of eggs; 



The third brood of larvss, all of which winter as larvae ; 

 The third brood of pupx, which transform the following spring 



("spring pupae"); 

 The third brood of moths, which emerge the following spring 

 ("spring moths"). 



Fig.I. — Emergency curve ofspring brood ofmothsin 1909, at Douglas, Mich. RecordsofR. W. Braucher. 



(Original.) 



SEASONAL-HISTORY STUDIES OF 1909. 



The records on the life history of the codling moth during 1909 

 cover merely the essential features and were all made by Messrs. 

 R. W. Braucher and W. PostifT. The experiments were conducted 

 in an outdoor rearing shelter, and inasmuch as the rearing material 

 was from band-record collections the results should closely represent 

 normal conditions. 



TIME OF EMERGENCE OF MOTHS OF THE SPRING BROOD. 



In Table I and figure 1 is given the rate of emergence of 114 indi- 

 vidual moths. The period for the maximum emergence is here well 

 denned, occurring from June 17 to 24. Considering the limited num- 

 ber of insects used for this experiment it is very probable that isolated 

 moths may have appeared even previous to June 1 and later than 

 June 15, since the two broods of moths generally overlap. 



