THE CODLING MOTH IN MICHIGAN. 25 



Table XXVII. — Feeding period of second-brood larvae; summary of Table XXVI. 



Number 



Davs 



Number 



Days 



Number 



Days 



of obser- 



of 



of obser- 



of 



of obser- 



of 



vations. 



feeding. 



vations. 



feeding. 



vations. 



feeding. 



3 



21 



5 



31 



6 



39 



2 



24 



11 



32 



2 



41 



1 



25 



2 



33 



2 



42 



1 



26 



3 



34 



7 



43 



3 



27 



3 



35 



1 



44 



3 



28 



6 



36 



1 



45 



3 



29 



6 



37 











4 



30 



6 



38 



81 



2 ; 770 



Length of feeding period. — In Table XXYI will be found the records 

 on the feeding periods for 81 individual larvae of the second brood. 

 The average length of feeding for the total number of observations is 

 34.2 days ; the maximum 45 days, and the minimum 21 days. As is 

 to be expected these results are much higher than those for the first 

 brood (compare with Table XXIII), since at this time of year a much 

 lower degree of temperature prevails, and more feeding may be neces- 

 sary for the hibernating larvae. Figure 8 (p. 26) shows the jar used 

 in the rearing of codling moth larvae. 



Time of leaving the fruit.— The Saugatuck band-record experiment 

 of figure 10 shows that the earliest mature larvae appeared under the 

 bands August 30, and that larvae were collected more or less abun- 

 dantly throughout September and the early part of October. The 

 almost total absence of larvae during November was to a large extent 

 due to the scarcity of fruit, and this condition materially limited the 

 number of second-brood larvae. 



Table XXVIII. — Band-record experiments, Saugatuck, Mich., 1910. 



July 13 

 July 17 

 July 20 

 July 23 

 July 26 

 Julv 29 

 Aug. 1 

 Aug. 4 

 Aug. 7 

 Aug. 10 

 Aug. 13 

 Aug. 16 

 Aug. 19 

 Aug. 22 

 Aug. 25 

 Aug. 28 

 Sept. 1 

 Sept. 3 

 Sept. 6 

 Sept. 9 





1 

 1 







17 I 

 13 



5 



1 



20 



2 



1 



10 



3 





20 



8 



1 



14 



18 





17 



18 





1 



25 





8 



24 





8 



17 





6 



28 





7 



9 



1 



13 



9 



2 



3 



11 



1 



9 



6 



9 





4 





3 



7 



4 



6 



Sept, 12 

 Sept. 15 

 Sept. 18 

 Sept. 21 

 Sept. 24 

 Sept. 27 

 Sept. 30 

 Oct. 3 

 Oct. 6 

 Oct. 9 

 Oct. 12 

 Oct. 15 

 Oct. 18 

 Oct. 21 

 Oct. 24 

 Oct. 28 

 Oct. 30 

 Nov. 2 



Total . 



13 



18 

 19 



126 

 16 

 10 

 7 

 22 

 13 

 3 



11 



8 

 5 

 3 

 2 

 

 2 



6j 



C3.,-| 



8 313 29 237 



1 12 larvae escaped. 



