. Bulletin of the Department of Agriculture. Agriculture; Agriculture. 10 BULLETIN 1235, U. S. DEPARTMENT OF AGRICULTURE. from June 1 to June 8, inclusive, with a maximum deposition of 422 eggs on June 4. Length of incubation.—Incubation records of 837 eggs are given in Table 5. The earlier eggs required rather more than the average period for incubation, while later, when the temperature was higher, the average period was much reduced. Table 5.—Time of deposition and length of incubation of eggs of the first brood of the codling moth, Yakima, Wash., 1919. Date of deposi- Num- ber of Numb
. Bulletin of the Department of Agriculture. Agriculture; Agriculture. 10 BULLETIN 1235, U. S. DEPARTMENT OF AGRICULTURE. from June 1 to June 8, inclusive, with a maximum deposition of 422 eggs on June 4. Length of incubation.—Incubation records of 837 eggs are given in Table 5. The earlier eggs required rather more than the average period for incubation, while later, when the temperature was higher, the average period was much reduced. Table 5.—Time of deposition and length of incubation of eggs of the first brood of the codling moth, Yakima, Wash., 1919. Date of deposi- Num- ber of Number of days from deposition to appearance of— Incubation period in days. Red ring. Black spoi tion. eggs. Aver- Maxi- Mini- Aver- Maxi- Mini- Aver- Maxi- Mini- age. mum. mum. age. mum. mum. age. mum. mum. May 26 35 5 5 11 11 14 12 27 10 3 3 9 9 12 11 June 1 61 3 3 11 9 14 12 2 38 3 3 10 10 12 12 3 161 3 3 11 10 14 12 4 218 5 5 11 10 15 13 5 76 5 5 13 12 16 14 6 34 6 6 12 12 14 13 7 33 7 7 10 10 14 13 8 45 8 8 10 10 13 12 9 2 8 8 10 10 12 11 11 14 7 7 9 9 11 10 12 36 7 7 9 9 11 10 13 10 7 7 8 8 11 9 14 10 6 6 8 8 10 9 15 6 6 6 7 7 9 9 16 3 6 6 8 8 9 9 17 39 6 6 7 7 9 8 18 1 5 5 7 7 8 8 20 2 4 4 7 7 9 - 9 23 3 -3 3 5 5 6 6 837 8 3 13 5 16 6 /SO. JUNE Fig. 4.—Hatching of larvae of the first brood of the codling moth at Yakima, Wash., 1919. LARVAE OF THE FIRST BROOD. Time of hatching.—First- brood larvas began hatch- ing in the insectary on June 7 (fig. 4), and continued until June 29, a total period of 23 days. On June 10, 11, and 12, no larvse hatched, owing not so much to low tempera- tures at this time as to the fact tha
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