. Bulletin of the Department of Agriculture. Agriculture; Agriculture. THE CODLING MOTH IN THE YAKIMA VALLEY. 25 Table 20.—Length of life of male and female codling moths of the spring brood, Yakima, Wash., 1920. Male. Female. Male. Female. Male. Female. Length of life. Num- ber of moths. Length of life. Num- ber of moths. Length of life. Num- ber of moths. Length of life. Num- ber of moths. Length of life. Num- ber of moths. Length of life. Num- ber of moths. Days. 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 4 10 6 9 7 9 20 12 19 13 16 17 20 26 18 Days. 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 2 8
. Bulletin of the Department of Agriculture. Agriculture; Agriculture. THE CODLING MOTH IN THE YAKIMA VALLEY. 25 Table 20.—Length of life of male and female codling moths of the spring brood, Yakima, Wash., 1920. Male. Female. Male. Female. Male. Female. Length of life. Num- ber of moths. Length of life. Num- ber of moths. Length of life. Num- ber of moths. Length of life. Num- ber of moths. Length of life. Num- ber of moths. Length of life. Num- ber of moths. Days. 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 4 10 6 9 7 9 20 12 19 13 16 17 20 26 18 Days. 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 2 8 3 5 4 6 12 11 15 18 16 23 26 38 24 Days. 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 18 15 12 12 11 11 4 16 10 8 4 5 6 0 4 Days. 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 21 33 17 20 20 16 14 20 12 16 17 12 9 3 7 Days. 32 33 34 35 36 37 38 39 40 41 43 45 Total. 4 2 2 4 4 1 2 1 1 3 2 0 Days. 32 33 34 35 36 37 38 39 40 41 43 45 Total. 0 3 1 1 0 0 0 0 0 0 0 2 368 455 Average length of life of male moths, days; female moths, days. Maximum length of life of male moths, 43 days; female moths, 45 days. Minimum length of life of male moths, 2 days; female moths, 2 days. THE FIRST GENERATION. EGGS OF THE FIRST BROOD. Time of egg deposition.—Spring-brood moths began ovipositing May 12, but owing to cold weather very few eggs were deposited before May 31, as shown in Figure 14. From then on eggs were. Fig. 14.—Time of deposition of eggs of the first brood of the codling moth at Yakima, Wash., 1920. deposited daily until July 11, with a maximum on June 18, 14 days later than the 1919 maximum. The temperature curve in Figure 14 shows for each day the average temperature for the period between 3 p. m. and 9 p. m., as this is the period during which most of the eggs are deposited. Length of incubation.—Observations were made on 1,010 eggs for the length of incubation. These and other data on the development of the eggs are given in Table 21,. Please note that these ima
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