46 



BULLETIN 932, IT. S. DEPARTMENT OF AGRICULTURE. 



PUPJE OF THE SPRING BROOD. 



Time of pupation. — The daily observations of the time of pupa- 

 tion of the wintering larvae are tabulated in Table XXIX and pre- 



fiPRlL MflV JUNE JULY PUGUST SEPTEMBER OCTOBER NOVEMBER 



S 10 IS 20 25 30 S 10 IS 20 25 30 S 10 IS 20 25 30 S 10 IS 20 2S 30 S 10 IS 20 25 30 S 10 IS 20 25 30 S 1 IS 20 26 30 S 10 IS 20 25 3C 



PUPPT/OH OF SPff/AJG BROOD. 



APPLES 



22-24- 



o 



FMFR6ENCL OF SPRING 8 ?00D MOTHS. 



OEPOSlTlOy OF FJRST Bf>00O EGGS. 

 8TH. 



HPTCHIHG OF Flf>T BROOD EG 5S. 



F/RST BROOq LflRl/PE LEP^/NG FRUIT. 

 .ioth. 



PUPPTIOt ' OF FIRST Bt >OOD LPRUPE. 



■NCE OF FIR-. 



BROOD MOTHS 



PI I PPT/ on 



J3R0OD LA, WPE. 

 2ND. 



CMFROEMCE 

 230-0. 



BROOD MOT\HS. 

 M-th. 



or position ; \of 



third BROOD E 5es 



HflTCHINtX OF TH/RD 



*J3P00D EGGS. 



Fig. 17. — Diagram of life history of the codling moth in the Grand Valley of Colorado, 1915. 



sented graphically in figure 18. Reference to this table will show 

 that 508 larva? were under observation and that the earliest pupation 



occurred April 16 and the latest 

 June 12, the period thus covering 

 about two months. The maximum 

 pupation took place May 6, when 

 37 individuals pupated. On April 

 28, 36 larva? transformed to pupae, 

 and if weather conditions had con- 

 tinued normal for the remainder 

 of the month, it is probable that 

 the maximum pupation would 

 fig. is.— Time of pupation of spring have occurred about May 1 ; but, 



brood of the codling moth, Grand m fe ^^ . ^ * h the 



Junction, Colo., 1016. & x 



