170 



DECIDUOUS FRUIT INSECTS AND INSECTICIDES. 



Table LVII. — A summary of Table LVI, shoving the departures from normal of the 

 average mean temperature for the growing season 1909, 1910, 1911, at San Jose, Cal. 



Month. 



February 



March 



April 



May 



June 



July 



August 



September 



October 



Total 



Average monthly departure from normal 



Departure from normal in- 



COMPARATIVE LIFE-HISTORY STUDIES FOR THE SEASON OF 

 1909, 1910, AND 1911. 



The temperature conditions (see Table LVI) indicated that 1910 

 was a very warm season favorable for the development of the codling 

 moth, while the 1911 season was very cold and unfavorable to this 

 insect, with 1909 an intermediate season. The 1910 season, while 

 apparently very warm, was a more normal season than the other two. 



On account of many lacking life-history records in 1909 but with 

 a good band record, and a poor band record in 1910 but with com- 

 plete life-history records, it is impossible to make perfect comparisons 

 of the three seasons. An examination of both band records and 

 rearing experiments shows the following data, however. (See Table 

 LVIII.) 



Table LVIII. — Summary of the band records for 1909, 1910, and 1911 along with rear- 

 ing results, showing the comparative size of the broods and relative number of trans- 

 forming and wintering larvae. 



Larval collections. 



Percentages for- 



Transforming larva>— total band collection. 



Wintering larvae— total band collection 



Relative proportion of first-brood larvse 



Relative proportion of second-brood larvse. 



Transforming larvae of first brood 



Wintering larvse of first brood 



27.6 

 72.4 

 95.0 

 5.0 

 33.5 

 66.5 



(') 



2+50.0 



2 +50. 



33.4 



66.6 



18.0 

 82.0 

 50.0 

 50.0 

 40.0 

 60.0 



1 Band record from summer apples. 



2 Approximately (from rearing records). 



The results as indicated by Table LVIII are not entirely in con- 

 formity with expectations. 



The relative proportions for the broods for 1909 and 1910 appear 

 correct in comparison with the weather conditions, but the relative 

 proportions for 1911 seem incorrect after examining the weather condi- 



