THE CODLING MOTH IH THE YAKIMA VALLEY. 



13 



MOTHS OF THE FIRST BROOD. 



Time of emergence. — Figure 6 combines the records of emergence 

 of the first brood of moths from insectary-bred material and from 

 band-record material. The first moth emerged July 8, the last, 

 September 24, and the maximum number, July 19. From the in- 

 sectary-bred material, the first moth was secured July 19, the last 

 September 3, and the maximum July 30. Some, if not most, of the 

 moths emerging in September from the band-record material were 

 probably second-brood moths, as several second-brood moths emerged 

 from the insectary-bred material at this time. There is some over- 

 lapping, as evidenced by the fact that the first moth of the second 



/2 /7 22 27 

 <JULY 



6 // /6 21 26 i?/ 

 /90&t/<ST 



S /O /S 20 25 



Fig. 6.— Emergence of the first and second broods of moths of the codling moth at Yakima. 



Wash., 1919. 



brood emerged August 29, while the last of the first brood emerged 

 September 3. For this reason, and because the second brood is 

 quite small, the records of the two have been combined. 



Oviposition by moths of the first brood. — As the spraying schedule in 

 the Yakima Valley requires an application of spray for the earliest 

 worms of the second brood, it is important to obtain the earliest date 

 of oviposition. On account of this, moths emerging from the band- 

 record material collected in the field were used for obtaining ovi- 

 position records, as the larvae from which they were reared had been 

 under natural conditions. A total of 1,251 moths were used. In 

 most cases these moths began ovipositing the -day following their 

 emergence. (See Table 10.) The averages are for cages and not 

 individuals. For some individual averages see page 69. 



