CODLING MOTH IN COLORADO. 



77 



to the appearance of the black spot was 6.36 days, maximum 9 days, 

 and minimum 6 days ; the average incubation period was 7.77 days, 

 maximum 11 days, 

 and minimum 7 days. 



LiARVJE 



OF THE 



Brood. 



Thied 



^£/=71^MB£ff 



Fig. 29. — Time of deposition of third-brood eggs of the 

 codling moth, Grand Junction, Colo., 1916. 



Time of hatching. — 

 The larvae o f t h e 

 third brood com- 

 menced to hatch Au- 

 gust 20, as will be 

 noted in Table LIV 

 and figure 30. Hatch- 

 ing continued daily, 

 with some exceptions, 

 up to September 21, 

 the period thus hav- 

 ing a duration of about one month. The larva? were hatching in 

 maximum numbers on September 4, and on this date 188 hatched. 

 A large proportion of the eggs, however, hatched previous to this, 



namely from August 

 22 to 29. 



Lengthof.the.feed- 

 ing perio d. — T h e 

 study of the feeding 

 period of larva? of 

 the third brood, 

 stock- jar method, in- 

 cluded 331 1 a r v a?. 

 The first larva? to 

 hatch entered the 

 fruit August 20, 

 while the last larva? 

 entered the fruit Sep- 

 tember 21. None of 

 the larva? that en- 

 tered the fruit after ^September 11 reached maturity. It will be 

 noted in Table LV that the average feeding period of the larva? 

 under observation was 37.55 days, maximum 68 days, and minimum 

 20 days. 



Fig. 



■SEPTEMBER 



30. — Time of hatching of third-brood eggs of the 

 codling moth, Grand Junction, Colo., 1916. 



