756 EXPERIMENT STATION RECORD. [Vol.36 



by citrus growers of the disappearance of C. dictyospermi in Calabra led to 

 investigations which showed this to be principally due to the scale being at- 

 tacljed by a fungus of the genus Cladosporium. 



Problems connected with the new Egyptian cotton pest, Gelechia gossy- 

 piella, the pink bollworm, L. H. Gough (Trans. 3. Internnt. Cong. Trop. Agr. 

 19U, vol. 1, pp. 385-398). — Substantially noted from another source (E. S. R., 

 35, p. 854). 



Note on a machine to kill Gelechia larvae by hot air, and the effects of 

 heat on Gelechia larvte and cotton seed, L. Gough (Min. Agr. Egypt, Tech. 

 and Sci. Serv. Bui. 6 {1916), pp. 15, pis. S; ais. in Rev. Appl. Ent., Ser. A, 4 

 (1916), No. 11, pp. 472, 473). — This is a description of a hot-air machine con- 

 sisting mainly of a furnace for the generation of the hot air, a hot-air chamber 

 through which the seed passes, and a motor. The results of work with the 

 pink bollworm, reported in tables, show that there is ample limit for regula- 

 tion of the temperature in such a way as to kill the worms without damaging 

 the seed. 



Life history of the codling moth in the Pecos Valley, New Mexico, A. !>. 

 Ql'aint.^nce and E. W. Geyek (U. S. Dept. Agr. Bid. 429 (1917), pp. 90, figs. 

 17). — This is a report on life history studies of the codling moth conducted by 

 the division of Deciduous Fruit Insect Investigations of the Bureau of Ento- 

 mology in continuation of those previously noted (E. S, R., 33, p. 559). In the 

 work at Roswell, N. Mex., in the Pecos Valley, special attention was given to 

 the biology of the pest during 1912 and 1913 and to extensive spraying opera- 

 tions, but during 1914-15 the worlj was limited to orchard experiments. 



The codling moth produced three generations in this valley during 1912. 

 while In 1913 a partial fourth brood of larvae developed. In 1912 pupation of 

 the overwintering larvae began March 15 and continued for about one month, 

 while in 1913 the first pupa was observed March 23 and pupation continued 

 for 51 days. During 1912 the moths of the spring brood appeared April 12 

 and continued to emerge to May 28. In 1912 oviposition of the spring brood 

 of moths began April 16, continuing 45 days, while In 1913 the first eggs of 

 this brood were noted INIay 1. 



" The time required for first-brood eggs to hatch In 1912 was 9.05 days, with 

 a range of 5 to 13 days, whereas in 1913 eggs of this brood hatched on an 

 average in 5.96 days, with a range of from 4 to 11 days. First-brood larvae 

 In 1912 fed on an average 21.52 days, and In 1913, 24.45 days. The pupal stage 

 of the first brood In 1912 averaged 12 days, and In 1913, 11 days. Moths of the 

 first brood In 1912 were out June 9 and continued to emerge until July 22. In 

 1913 first moths were out June 8, the period of emergence lasting until July 

 10. First-brood moths in 1912 oviposited over an average period of 4.45 days, 

 and in 1913 5.7. The life cycle of the first generation In 1912 required on the 

 average 51.14 days, and In 1913, 46.91 days. 



" Second-brood eggs In 1912 averaged 5.62 days for Incubation, with a mini- 

 mum of 4 and a maximum of 8 days. The incubation period of eggs of this 

 brood in 1913 was on the average 4.9, with a minimum of 4 and a maximum of 

 7 days. The feeding period of second-brood larvae in 1912 averaged 21.23 days, 

 and in 1913, 19.7 days. The pupal stage for second-brood pupae in 1912 averaged 

 11.23 days and in 1913, 11.06 days. The life cycle for the second generation of 

 the codling moth in 1912 averaged 41.26 days, and in 1913, 41.04 days. 



" Eggs of the third brood in 1912 averaged 5.75 days for the incubation period, 

 with a minimum of 4 and a maximum of 9 days. In 1913 the incubation period 

 for eggs of this brood averaged 5.36 days. During 1912 third-brood larvae 

 fed on an average of 26.55 days with a range of from 15 to 56 days, whereas 

 in 1913 the average feeding period for tliis brood was 20 days, the range 





