. Bulletin of the Department of Agriculture. Agriculture; Agriculture. 8 BULLETIN 1235, U. S. DEPARTMENT OF AGRICULTURE. MOTHS OF THE SPRING BROOD. Time of emergence.—The first moth emerged May 13, about two weeks after the apple trees were in full bloom. Moths continued to emerge until June 19, as shown in Figure 2, with a final straggler on June 26. The maximum period of emergence occurred from May 18 to June 5, with a maximum of 85 moths on May 21. On May 29 and 30 there was a decided drop in the temperature, resulting in a temporary falling off of the number of moths emerging. Otherwi
. Bulletin of the Department of Agriculture. Agriculture; Agriculture. 8 BULLETIN 1235, U. S. DEPARTMENT OF AGRICULTURE. MOTHS OF THE SPRING BROOD. Time of emergence.—The first moth emerged May 13, about two weeks after the apple trees were in full bloom. Moths continued to emerge until June 19, as shown in Figure 2, with a final straggler on June 26. The maximum period of emergence occurred from May 18 to June 5, with a maximum of 85 moths on May 21. On May 29 and 30 there was a decided drop in the temperature, resulting in a temporary falling off of the number of moths emerging. Otherwise the emergence curve is fairly regular. Oviposition by moths of the spring brood.—Oviposition records were obtained from 579 moths of the spring brood. One lot of moths, emerging May 27, began ovipositing the next day, but the interval before oviposition aver- aged days, with a maximum of 18 days. The interval before maximum oviposition aver- aged days, with an average ovipo- sition period of days and an average time from emergence to last oviposition of days. All these data are given in Table 3. It must be borne in mind that these averages are for cages and not for individuals. Some individual averages will be found on page Fig. 2. -Emergence of the spring brood of moths of the codling moth at Yakima, Wash., 1919. Table -Oviposition by codling moths of the spring brood in rearing cages, Yakima, Wash., 1919. Sex. Date of— Number of days— Total num- Ob- Num- From From ber ser- ber Be- emer- Of ovi- posi- tion. of va- tion. of moths. Male. Fe- male. Emer- gence. First oviposi- tion. Maxi- mum ovi- position. Last ovi- position. fore ovi- posi- tion. gence to maxi- mum ovipo- sition. gence to last ovipo- sition. eggs de- pos- ited. 1 19 14 5 May 18 May 21 May 28 June 5 3 10 16 18 13 2 24 14 10 May 19 June 6 June 6 June 16 18 18 11 28 10 3 26 18 8 May 20 May 22 May 26 June 5 2 6 15 16 43 4 75 34 41 May 21 May 23 June 1 June 15 2 11 24 25 212 5
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