CODLING MOTH IN SANTA CLARA VALLEY. 



123 



Table X. — Emergence of spring mollis from wintering material collected on banded trees 



during 1909. 



The emergence of the first moths on March 30 and 31 was undoubt- 

 edly caused by the sudden rise in mean temperature about this time, 

 as will be seen from figure 1 . Also the period of low mean temperature 

 during the first 12 days of April stopped emergence to a minimum. 

 A rise in temperature from April 12 to 18 brought forth moths again, 

 and the high period of mean temperature about April 22 to 24 caused 

 the first absolute maximum of emergence, then a drop in tempera- 

 ture and a corresponding cessation of emergence, and finally the 

 second absolute maximum emergence on May 6, which was caused 

 by high mean temperature about that period and the rest of the 

 month. After May 18 practically all of the moths had emerged 

 and no further conclusions could be drawn of the influence of tempera- 

 ture on the emergence of spring-brood moths. Most of the moths 

 emerged during the period from April 15 to May 20 and the maximum 

 period thus embraced about 35 days. The whole period of emer- 

 gence of spring-brood moths extended from March 30 to June 9, a 

 period of 72 days. 



Time of emergence of moths in the spring versus the time wintering 

 larvse leave the fruit the preceding year. — In Table XI is given a detailed 

 account of the band collections of 1909, including the dates of collec- 

 tion, relative number of pupa3 and larvae, daily emergence of the first 

 brood moths for that year (1909), and the daily emergence of the 

 spring-brood moths which came from the overwintering larva?, the 

 latter being both first and second brood larvae of 1909. In Table 

 XI is given also the relative percentage of moths emerging from 

 each separate band collection for the years 1909 and 1910, including 

 totals for each year and a summary of the total moths emerging for 

 both years. As previously recorded by Mr. Hammar, 1 the time the 



' Bureau of Entomology, Bui. No. 80, Part VI. 

 56602°— Bull. 115, pt 3—13 2 



