166 DECIDUOUS FRUIT INSECTS AXD INSECTICIDES. 



Table LV. — Comparison of life history and stages of the codling moth for 1910 and 1911. 



Year. 



Spring pupae. 



First-brood eggs. Thst ^^ V9i 



First-brood pupae. 



I L 



Maxi-i Mini-! Aver- Maxi- Mini- Aver- Maxi- Mini- A ver- Maxi- 1 Mini- 



mum, mum. age. mum. mum. 



mum. mum. age. mum. mum 



1910. 

 1911. 



Day.?. Days. Days. Daus. Days. Days. Days. Days. 

 61 29 40.7 17 8 S12.4 I 103 31 



56 30 42.4 15 10 12.77 42 26 



Days. Days. Days. Days. 

 48.8 55 | 11 19.04 



34.67 37 18 23.12 



Year. 



Life cycle egg to egg. Second-brood eggs. 



Second-brood larvae in 

 fruit. 



Maxi- 

 mum. 



Mini- [ Aver- Maxi- 

 mum. J age. mum. 



Mini- 

 mum. 



Aver- 

 age. 



Maxi- 

 mum. 



Mini- 

 mum. 



Aver- 

 age. 



1910 



1911 



Days. 

 101.4 



Days. Days. Days. 

 58.4 78.62 17 

 67 71.3 ! 15 



Days. 



7 

 11 



Days. 

 10.92 

 12.5 



Days. 

 59 

 79 



Days. 

 30 

 43 



Days. 

 40 

 58.15 



i This is the sum of the length of life in the fruit and the post-larval stage. Consequently the sum of 

 the two maxima, or 103 days, is theoretical, as the maximum life cycle was only 101.4 days. Similarly 

 the sum of the two minima, or 2t> days, is also theoretical. 



WEATHER RECORDS FOR 1909, 1910, AND 1911. 



During the three years that the codling moth has been studied at 

 San Jose, Cal., a comparison of the weather conditions influencing 

 the life-history records has been made. These records have been 



FEBRUARY 



5 10 15 2025 



nARCH 

 5 10 15 2025 



APRIL 

 5 10 15 20 25 



MAY 



5 10 (5 2C25 



jume 



5 10 I5 2C25 



JULY 



5 10 15 2025 



AUGUST 

 5 10 152025 



SEPTEMBER 

 5 10 15 20 25 



OCTOBER 

 5 10 15 2025 







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Fig. 39.— Diagram showing seasonal history of the codling moth during the season of 1911. (Original.) 



obtained through the United States Weather Bureau Station at San 

 Jose, which is about 3 miles from the laboratory used for study- 

 ing the codling moth. Table LYI presents the daily mean tempera- 



