CODLING MOTH IN SANTA CLARA VALLEY. 



147 



Table XXXI. — Temperature conditions inftuencirg the pupal period of the spring 



brood in degrees Fahrenheit. 



SPRING BROOD OF MOTHS. 



Time of emergence of moths in the spring. — Figure 33 shows 

 graphically the time of emergence and the relative abundance of 

 moths of the spring brood with the corresponding daily mean tempera- 

 ture in degrees Fahrenheit. The records for these observations are 

 given in Table XXXII. 



Table XXXII. — Emergence of spring moths, 1911, from wintering material collected on 



banded trees during 1910. 



The rise in temperature on March 27 seems to have started a few 

 moths to emergence while the later rise on April 13 brought out a 

 large number of adults, and it was at this time that the first abso- 

 lute maximum occurred. From this time on to May 20 the temper- 

 ature 1 remained little changed, but on that date it rose and seemingly 

 occasioned the second absolute maximum emergence, which occurred 

 the next day. By May 28 emergence was on the wane and the tem- 

 perature had little or nothing to do with emergence following. The 

 majority of moths issued between April 20 and May 23, a maximum 

 period of 33 days. The total period extended from March 24 to 

 June 20, or 89 days. 



