128 



DECIDUOUS FRUIT INSECTS AND INSECTICIDES. 



Table XIV. — Showing the variation in the length of the egg stage as recorded in 



Table XII. 



Eggs. 



Days. 



Eggs. 



Days. 



27 



8 



96 



13 



51 



9 



15 



14 



181 



10 



2 



15 



209 



11 







16 



131 



12 



8 



17 



FIRST BROOD OF LARV.E. 



As has been already stated, a number of the first-brood larvae do 

 not transform with the rest of the brood, but cocoon for the winter 

 and hibernate with second-brood larvae. 



In rearing the codling-moth larvae to obtain the time spent in 

 feeding and the life cycle of the first generation, apples were used 

 upon which several eggs had been deposited, in order to insure some 

 of the larvae living. 



A number of the larvae transformed within the half-dried apples 

 and consequently only partial records can be given concerning them. 



Time of hatching. — The first larvae in the rearing cages appeared 

 May 13 but these did not come from eggs deposited by the earliest 

 moths on account of insufficient numbers of the latter. 



It is very probable that the earliest larvae appeared in the field 

 from about April 20 to 25 if the time of emergence of the earliest 

 moths, from March 30 to 31, is taken into consideration. As no 

 effort was made to secure data as to when the latest larvae hatched in 

 the rearing cages this can not be given, but the latest hatching larvae 

 of the first brood probably appeared from about July 1 to 10, consid- 

 ering the time when the last moths emerged. 



Number oflarvse developing in one apple. — In practically all of the 

 rearing work to obtain a record of the time of feeding of the larvae 

 apples were used upon which a number of eggs had been deposited. 

 In some instances as many as 20 eggs were laid on one apple but in 

 no instance did a large number of larvae mature. An examination 

 of Table XV shows that usually one larva left the fruit, two larvae 

 left the apple in five instances, and three larvae in one instance. In 

 apples Nos. 11, 12, 13, 14, 15, and 16 a number of larvae transformed, 

 the number varying from 2 to 5. This seems to have been unusual 

 according to the writings of other authors and was undoubtedly 

 abnormal. 



Period of feeding of larvse in fruit.— In. Table XV is recorded the 

 feeding period of 46 larvae which entered 16 apples, of which 27 left 

 the apples, the rest remaining in the fruit; 31 larvae transformed, 13 

 wintered, and 2 died. Of this number 25 transformed in the fruit, 

 and 9 spun their cocoons, evidently intending to winter in the dried 

 and shrunken apples. 



