46 



BULLETIN 932, IT. S. DEPARTMENT OF AGRICULTURE. 



PUP7E 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- 



APRIL M/9Y- JUNE JULY j RUSLKST SEPTEMBER | OCTOBER NOUEMBER 



S 10 IS 20 2S 30 S 10 15 20 2S 30 S 10 IS 20 25 30 S 10 IS 20 2S 30 S 10 IS20 2S 30 6 10 IS 20 25 30 5 10 IS 20 2S 30 5 10 IS 20 25 X 



PUPATION OF SPRING BROOD. 



EMERGENCl OF SPRING B. ?OOD MOTHS. 



DEPOSITION OF FIRST BfPOOD EGGS. 

 em 



HA1 'CUING OF FIR >T BROOD EG ?S. 



FIRST BPOOC 



LRRl/RE LEPi'ING FRUIT. 



PUPRTIOI' OF FIRST BI'OOD LRRURE. 



■ 'NCE OF fir-; r BROOD MOTI IS. 



PUPRTION 



EMERGENCE p/2 





PrPCi^lTION \ '.OF 



THIRp BROOO E SSS. 



HATCHING OF THIRD 



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, 3G 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 ^j be . th h the 



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