CODLING MOTH IN SANTA CLARA VALLEY. 175 



Table LIX shows the detailed summaries of this work and that the 

 five trees of Vicar pears averaged 2.98 per cent wormy fruit, including 

 windfalls. The Doyenne du Cornice averaged 2.24 per cent wormy, 

 the Bartlett 2.62 per cent, the BuerreClargeau4.38 per cent, the Winter 

 Nelis 4.70 per cent, and the Easter Buerre 4.46 per cent. It should be 

 noted that the last three varieties show nearly twice the wormy fruit 

 that the other varieties do. This can be explained by the fact that 

 they are later in maturing and hence give the second brood of the cod- 

 ling moth a much better chance to work. The senior author has fre- 

 quently observed that Bartlett pears in the Santa Clara Valley usually 

 escape nearly all of the second brood of codling moth by being picked 

 so early. A comparison of the dates of spraying with the life-history 

 records will show that most of the spraying was timed a little early, 

 even allowing 10 days because it is an extremely early orchard. 



Season of 1911. — This year the spraying was accomplished in a more 

 through manner and at a more opportune time, the first application 

 from April 12 to 15, or just as most varieties were shedding the petals; 

 the second application from June 1 to 4 ; and the third from July 5 to 9. 

 Only two trees were examined in each variety and the work was done 

 weekly as in 1910. All the fruit at picking time on the indicated 

 trees was examined. 



Table LX gives a summary of the work performed. 



