62 



DECIDUOUS FRUIT INSECTS AND INSECTICIDES. 



The results from the above band records are presented in Tables 

 LXIII and LXVIII, in so far as same could be completed in 1911. 

 The time of appearance of larvae and their relative abundance in the 

 respective localities have been graphically shown by curves in figures 

 18 and 19. It will be noted here that there is practically no differ- 

 ence in the time of appearance of the first larva? in the five localities; 

 nor is there any difference in the time of appearance of the earliest 

 second-brood larvae, so far as this could be determined. In account- 

 ing for this uniformity in time of maturity of larvae it should be 

 remembered that the seasonal conditions during 1911 were quite 



Fig. 17. — Mailing case used for shipping codling-moth larvae. (Original.) 



unusual. The spring opened up suddenly and uniformly over the 

 entire fruit belt, and the prevailing high temperature must have 

 started the development of the insects more or less at the same time 

 in the different sections. During 1910, it will be recalled that in these 

 localities a slight difference was observed in the time and rate of 

 appearance of the first brood of larvae and practically no difference 

 in the time of appearance of the second brood of larvae. We may 

 deduce from these observations that the seasonal development may 

 in years become more uniform in the different sections of the fruit 

 belt than is generally the rule, and that these differences are more in 

 evidence during the early spring than during the rest of the season, 

 while at midsummer conditions are more or less uniform for the 

 whole belt. 



