CODLING MOTH IN COLORADO. 



45 



The life-history data obtained in 1915 are shown in diagram in 

 figure 17. 



SEASONAL-HISTORY STUDIES OF 1916. 



During the season of 1916 the life-history studies of the codling 

 moth were continued along the same lines as in the preceding year. 

 In several instances, however, the work was elaborated somewhat, 

 since the amount of material on hand was a little larger than in 

 1915. The biology of the codling moth in 1916 was quite similar to 

 that of 1915, except that the second generation began somewhat 

 earlier in the season. Full data on the third brood were obtained. 







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Fig. 16. — Time of emergence of codling moths from band-collected material, Hamilton 

 and Edwards orchards, Grand Junction, Colo.,, 1915. 



The blooming period of apple trees occurred in 1916 about the 

 same time as in the previous year and, as in 1915, was followed by a 

 little freezing weather. On the morning of June 30 the temperature 

 dropped to 27° or 28° F. in some parts of the valley, while on the 

 next morning the temperature was about 1° lower. At this time 

 about 85 to 90 per cent of the blossoms had dropped in the orchards 

 of the Fruit vale district. While some injury resulted from these 

 freezes, it was not sufficient to cause a serious crop loss. Frost rings 

 and pits, the latter being in the calyx cavity, developed in much of 

 the fruit, however, and, as a result, the codling moth larvse fre- 

 quently entered the fruit through these frost pits. 



