. Bulletin of the Department of Agriculture. Agriculture; Agriculture. CODLING MOTH IN COLORADO. 25 three clays from banded apple trees in the Hamilton orchard. The first of these sources was used primarily as a means of establishing the approximate emergence limits of the first-brood moths, while the moths that issued up to August 19 from the larvae collected in the Hamilton orchard were used for the ovi- position study of the first brood. The lat- ter moths were em- ployed for this pur- pose because their relative rate of emer- gence approaches nor- mal field conditions more closely tha
. Bulletin of the Department of Agriculture. Agriculture; Agriculture. CODLING MOTH IN COLORADO. 25 three clays from banded apple trees in the Hamilton orchard. The first of these sources was used primarily as a means of establishing the approximate emergence limits of the first-brood moths, while the moths that issued up to August 19 from the larvae collected in the Hamilton orchard were used for the ovi- position study of the first brood. The lat- ter moths were em- ployed for this pur- pose because their relative rate of emer- gence approaches nor- mal field conditions more closely than that of the moths from the insectary reared larvae. According to the insectary-bred material, the first moth appeared July 7 and the emergence continued daily, except on a few days, to August 15. (See Table XIV and fig. 6.). Fig. 6.—Time of emergence of moths of the first brood of the codling moth, Grand Junction, Colo., 1915. Table XIV.—Time of emergence of codling moths of the first brood, from material reared at the insectary, Grand Junction, Colo., 1915. Date of Num- Date of Num- Date of Num- Date of Num- emer- ber of emer- ber of emer- ber of emer- ber cf gence. moths. gence. moths. gence. moths. gence. moths. July 7 2 July 19 17 July 29 10 Aug. 7 7 9 2 20 12 30 12 8 8 11 20 21 ' 17 31 13 9 5 12 12 22 9 Aug. 1 12 10 3 13 30 23 14 2 9 12 1 14 13 24 14 3 9 13 2 15 19 25 27 4 15 15 1 16 17 24 13 26 27 2 13 5 6 17 3 426 18 30 28 9 As given in Table XXV, the first moth of the second brood issued August 23, thus leaving a period from August 16 to 22, inclusive, during which no moths issued from larvae reared at the insectary. This condition did not obtain with the material from the Hamilton orchard on account of the much larger number of individuals in- volved, but instead moths issued continuously during the foregoing period as would naturally occur in the field. During the interval August 16 to 22 there was probably an overlapping of the broods. Please note that
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