. Bulletin of the Department of Agriculture. Agriculture; Agriculture. CODLING MOTH IN COLORADO. 59 Moths of the First Brood. Time of emergence.—As in the studies of 1915 (p. 24), a record was kept of the time of emergence of first-brood moths reared from insectary-bred material in order to determine the approximate limits of the brood. In Table XL it will be noted that 829 moths issued from July 5 to August 19, inclusive; the same data are presented graphically with temperatures in figure 23. Records were also taken of the time of emer- gence of the moths that issued from the larvae coll
. Bulletin of the Department of Agriculture. Agriculture; Agriculture. CODLING MOTH IN COLORADO. 59 Moths of the First Brood. Time of emergence.—As in the studies of 1915 (p. 24), a record was kept of the time of emergence of first-brood moths reared from insectary-bred material in order to determine the approximate limits of the brood. In Table XL it will be noted that 829 moths issued from July 5 to August 19, inclusive; the same data are presented graphically with temperatures in figure 23. Records were also taken of the time of emer- gence of the moths that issued from the larvae collected every three days in the Ham- ilton and Edwards or- chards. The moths that issued up to Au- gust 13, inclusive, were used for oviposition purposes in preference to those from the in- sectary-bred material, because their rate of emergence corre- sponded more closely to that which would have occurred in the field. These data are given in Table XLI and figure 24, and, as seen therein, the first moth emerged June 25. The rate of emergence, how- ever, was very low until July 1, but on this date IT moths issued. The first moths of the second brood from insectary-bred material issued August 7, and the data indicate that from August 7 to 19 there was an overlapping of the moths of the first and second broods. Since there is no way of determining the brood to which the moths from field material belong, a date (Aug. 13) midway between that of the last emergence of the first-brood moths and the first emer- gence of the second-brood moths was taken as the dividing line be- tween the two broods. Table XL.—Time of emergence of codling moths of the first brood, from ma- terial reared at the insectary, Grand Junction, Colo., Fig. brood, 1916. -Time of emergence of coaling moths of the first insectary-bred material, Grand Junction, Colo., Date of emer- gence. Num- ber of moths. Date of emer- gence. Num- ber of moths. Date of emer- gence. Num- ber of moths. Date of emer- gen
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