THE CODLING MOTH IN THE YAKIMA VALLEY 



21 



unsprayed trees. The spraying of the trees greatly reduced the total 

 number of worms but had no effect on the time of leaving fruit, the 

 maximum number occurring in both groups of trees on the same day, 



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Fig. 10.— Occurrence of codling moth larvae under bands on apple trees at Buena,Wash., 1919. 



August 23. Here, as at Yakima, a definite break occurred between 

 the first and second broods about the 1st of August (fig. 10). The 

 maximum number of first-brood larvae was collected on July 3, 14 





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Fig. 11.— Seasonal history of the codling moth at Yakima, Wash., 1919. 



days earlier than at Yakima, and the maximum number of second- 

 brood larva? occurred August 23, five days earlier than at Yakima. 

 A summary of the seasonal history of the codling moth in 1919 is 

 shown in Figure 1 1 . 



