20 



BULLETIN" 189, U. S. DEPARTMENT OF AGRICULTURE. 



Larvae began to appear on June 27, and were taken under the 

 bands in numbers through the remainder of June, all of July, and 

 part of August. It will be noticed that on August 25 (fig. 11) there 

 was a sharp decrease in the number of insects collected. Considering 

 the time first-brood moths began appearing in the rearing cages at 

 Hagerstown, and correlating with what was taking place at Win- 

 chester and elsewhere, second-brood larvae very likely began appear- 



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Fig. 11. — Diagram to illustrate band collections of larvae of the codling moth at Hagerstown, Md., in 



1913. 



ing under the bands soon after August 25, though an unusual over- 

 lapping of the two broods of larvae is apparent in the collections. 

 Records were discontinued about October 25, though no larvae 

 appeared under the bands later than October 18. 



The 8.24 per cent of transforming larvae taken under the bands at 

 Hagerstown in 1913 compares closely with the 8.68 per cent that 

 transformed in 1912. The 32.04 per cent of larvae that died from 

 handling, cannibalism, etc., in 1913 is much higher than has usually 

 been observed, due in part to the fact that one jar of larvae was 

 devoured by mice, and discarding consideration of this cage the loss 

 is brought down to 29.37 per cent. The 59.72 per cent of wintering 

 larvae is only slightly less than the 65.06 per cent obtained in 1912. 



SUMMARY FOR SEASON OF 1913. 



Spring-brood moth emergence began May 15 and closed June 27. 

 Allowing 10 to 12 days from emergence to hatching of first eggs, we 

 might expect that first-brood larvae began entering the apples May 

 25 to 27. First-brood larvae appeared under the bands on June 27. 

 First-brood moths began to emerge in the rearing cages on July 8, 



