. Bulletin. Insects; Insect pests; Entomology; Insects; Insect pests; Entomology. THE CODLING MOTH IN MICHIGAN. 71 The time of the emergence of the earliest moths has closely fol- lowed the time of blossoming of apples and occurred from 5 to 10 days after the blossoms dropped (Baldwin apples). By adding to these figures the time of flight of the moths previous to oviposi- tion and the time of incubation of the eggs it was found that fully three weeks elapsed before the hatching of the earliest larval of the first brood. In 1909 the moths commenced to appear at a normal time, but were somewhat
. Bulletin. Insects; Insect pests; Entomology; Insects; Insect pests; Entomology. THE CODLING MOTH IN MICHIGAN. 71 The time of the emergence of the earliest moths has closely fol- lowed the time of blossoming of apples and occurred from 5 to 10 days after the blossoms dropped (Baldwin apples). By adding to these figures the time of flight of the moths previous to oviposi- tion and the time of incubation of the eggs it was found that fully three weeks elapsed before the hatching of the earliest larval of the first brood. In 1909 the moths commenced to appear at a normal time, but were somewhat delayed in reaching a maximum of emergence. The season as a whole was fairly normal. The late fall, together with. Fig. 21.—Diagram showing time ol emergence and relative abundance of spring-brood and summer-brood codling moths, and blooming period of apple trees, during 1909, 1910, and 1911 at Douglas, Mich. (Original.) other favorable influences, produced a development of a very large second brood of larvae. Of the total number of larva1 for the year, 43 per cent were of the first brood and 57 per cent of the second brood. This occurrence was perhaps directly due to the unusual rate of emergence of the moths of the summer brood. These com- menced to appear at the normal time, but already reached a maxi- mum during the early part of August (fig. 21) instead of the Latter part of the month, which is the general tendency as shown for 1910. In the band-record curves of figure 22 is shown a corresponding rate in the time of maturity of larvrc of the second brood. The maximum in the first brood of larvae occurred comparatively late,. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original United States. Bureau of Entomology. Washington : G. P. O.
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