CODLING MOTH IN SANTA CLARA VALLEY. 



147 



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



brood in degrees Fahrenheit. 



Month. 



Maximum. 



Minimum. 



Mean. 



Departure 



from 



normal. 



March 



F. 

 63.3 

 65.0 

 69.2 

 65.8 



° F. 

 46.0 

 42.7 

 43.8 

 44.2 



° F. 

 54.6 

 53.8 

 56.5 

 55.0 



+0.9 

 -2.5 

 -4.2 







Average 





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. 





Number 





Number 





Number 





Number 



Date. 



of 



Date. 



of 



Date. 



of 



Date. 



of 





moths. 





moths. 





moths. 





moths. 



Mar. 24.. 



1 



Apr. 16 



7 



May 9 



9 



June 1 



6 



Mar. 25 







Apr. 17 



11 . 



May 10 



22 



June 2 



7 



Mar. 26 



1 



Apr. 18 



12 



May 11 



32 



June 3 



6 



Mar. 27 







Apr. 19 



11 



May 12 



23 



June 4 



6 



Mar. 28 







Apr. 20 



33 



May 13 



20 



June 5 







Mar. 29 







Apr. 21 



26 



May 14 



18 



June 6 



2 



Mar. 30 







Apr. 22 



11 



May 15 



21 



June 7 



3 



Mar. 31 







Apr. 23 



28 



May 16 



33 



June 8 



4 



Apr. 1 



2 



Apr. 24 



8 



May 17 



15 



June 9 



4 



Apr. 2 







Apr. 25 



10 



May 18 



15 



June 10 



2 



Apr. 3 







Apr. 26 



3 



May 19 



12 



June 11 



2 



Apr. 4 



1 



Apr. 27 



1 



May 20 



32 



June 12 



1 



Apr. 5 



1 



Apr. 28 



10 



May 21 



40 



June 13 



2 



Apr. 6 



3 



Apr. 29 



30 



May 22 



17 



June 14 







Apr. 7 



1 



Apr. 30 

 May 1 



4 



May 23 



24 



June 15 



1 



Apr. 8 



1 



10 



May 24 



1 



June 16 







Apr. 9 







May 2 



22 



May 25 



5 



June 17 



1 



Apr. 10 







May 3 



7 



May 26 



15 



June 18 







Apr. 11 



2 



May 4 



20 



May 27 



2 



June 19 







Apr. 12 



2 



May 5 



6 



May 28 



2 



June 20 



1 



Apr. 13 







May 6 



15 



May 29 



9 







Apr. 14 



5 



May 7 



6 



Mav 30 



9 







Apr. 15 



13 



May 8 



11 



May 31 



8 







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 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. 



