:814 JOURN.IL OF THE ROYAL HORTICULTURAL SOCIETY. 



It has been observed that the moths feed upon apple-juice, and I saw 

 two moths feeding upon the juice of a crushed apple. Mr. Hitt tells me 

 that it is common to find moths about cider mills. I have found that if 

 a, piece of ripe apple was placed in a cage of moths they would lay eggs 

 in abundance, and if the apple was wanting no eggs or but few would be 

 laid. 



After laying eggs, the moths in cages die in about a week. 



Broods of the Insect. 



In view of the fact of the difference of altitude and temperature in 

 Idaho, there must exist a corresponding difference in the number of 

 broods. 



Upon arriving at Boise I immediately commenced work upon this 

 •question. I found the overlapping of broods to be something remarkable. 

 From July 7 to about September 1, I could find in the field all stages of 

 the insect except the adult, which I could breed in cages. From my band 

 records I find that while I kept records there were larvae going under 

 bands every day. 



From the records of Mr. Ayers, of Boise (as given later), we find that 

 in 1897 there were larvje under the bands every week from June 25 to 

 October 19. To sum up, we have every day throughout the season moths 

 emerging and laying eggs, eggs hatching, larvse coming out of apples and 

 spinning cocoons, and larvae changing to pupfe. 



This fact, together with the number of broods, certainly explains why 

 the codling moth is more injurious in the West than in the East. The 

 overlapping can be accounted for by the difference in rate of development 

 of different individual insects. 



Professor Aldrich says that in the section from Boise to Weiser and 

 about Lewiston there are at least three broods, and part of a fourth was 

 observed at Boise this year (1899). Mr. McPherson, Mr. Hitt, and others 

 have arrived at the same conclusion. Without doubt the number of 

 broods in Fremont and Bingham Counties is less. 



The following are the band records taken by Mr. Ayers, of Boise, on 

 140 trees : — 



Date 



L;xrva; 



Date 



Lan-ae 



1897. 





1898. 





July 2 



862 



July o 



1,118 



July 9 



704 



Julv 13 



2.201 



July 16 



1,268 



Jul'v 20 



2,020 



July 23 



740 



July 27 



1.454 



August 2 ... 



606 



August 3 ... 



1,335 



August 9 ... 



290 



August 10 ... 



963 



August 18 ... 



580 



August 17 



1,095 



August 25 ... 



684 



August 24 ... 



1,125 



September 2 



1,526 



August 31 ... 



1,580 



September 10 



1,227 



September 7 



1,474 



September 21 



1,340 



September 14 



1,860 



October 4 ... 



1,642 



September 22 



1.965 



October 19 



778 ! 



October 1 ... 



1,594 







October 10 



1,125 



