18 



DECIDUOUS FRUIT INSECTS AND INSECTICIDES. 



Table XIX. — Incubation periods of third-brood eggs laid in Cage IV (recorded in 



Table XV). 



Number 

 of eggs. 



Eggs laid (at 

 night). 



Red ring 

 appeared. 



Black spot 

 appeared. 



When hatched. *gg£ 



55 

 54 



Aug.8 



Aug. 9 



Aug. 11 



Aug. 12 



Aug. 13 



Days. 



Aug. 14, a. m : 5 



Aug. 14, night...! 5 



Aug. 14, a. m 



Kecords of other eggs, mostly of the third brood, laid throughout 

 the latter part of the season are given in Table XX. 



Table XX. — Incubation periods of miscellaneous second-brood and third-brood eggs. 



Number 

 of eggs. 



94 



50 



Eggs laid (at 

 night). 



July 30.. 



Aug. 12. 

 Aug. 13. 

 Aug. 28. 

 Aug. 29. 

 Sept. 7.. 



Sept. 11. 

 Sept. 17. 



Sept. 23.... 

 Sept, 24-27. 

 Oct. 16 



Red ring 

 appeared. 



Aug. 14, p.m. 



Aug. 30. 

 Aug. 31. 

 Sept. 9.. 



Sept. 13. 



Oct. 18-19.. 



Black spot 

 appeared. 



Aug. 17, a. m 



Sept. 2 



Sept. 4 



Sept. 13, a. m. 



Sept. 16 



Sept. 24, a. m. 



Oct. 3.. 



Oct.' 29! 



When hatched. 



Aug. 4, evening 



and night. 

 Aug. 17, night... 

 Aug. 18, p. m. .. 



Sept. 3, p. m 



Sept. 5 



Sept. 13, p. m. 



and night. 



Sept. 17, m 



Sept. 25, p. m. 



and night. 



Oct. 5, a. m 



Oct. 9-15 



Dried up 



Length of 



Days. 

 5 



5 

 5^-6 



5^ 



Hi 



14-18 

 13+ 



THIRD-BROOD LARV.E. 



In the cages the first hatching of third-brood larvae was on August 

 14. Judging from the emergence of second-brood moths July 25, 

 third-brood larvae probably appeared in the field during the first week 

 of August. Owing to the early dropping of the small crop of fruit in 

 1908, field observations on larvae entering fruit could not be made 

 during September. In the cages larvae continued to hatch in numbers 

 up to September 20, and the last on October 15. The last lot of eggs 

 developed as far as the black-spot stage on October 29, but failed to 

 hatch. 



As the harvesting of the apple crop in this region ordinarily begins 

 early in September, considerable numbers of the third brood would 

 fail to mature before fruit picking. Reared larvae of this brood 

 began to mature September 2, and the band record for 1907 (p. 23) 

 also shows an increase about this time. The calculated time of 

 maturing of the earliest third-brood larvae in 1908 is August 20. 

 Owing to the dropping of the fruit in 1908, the band record for this 

 season (p. 24) does not include a normal number of the later larvae. 

 In 1907 larvae spun cocoons under the bands as long as any apples 

 were on the trees, and at harvest time many small worms were still 

 in the fruit. 



