10 



DECIDUOUS FRUIT INSECTS AND INSECTICIDES. 



Length of spring pupal stage. — The results of observations on the 

 time of pupation and emergence of 106 individual insects are given 

 in Table VI. Those pupating in April remained in this stage for the 

 exceptionally long period of 59 days. The majority, pupating during 

 the latter half of May, remained in the pupal stage about 30 days, 

 wliile later larva?, pupating about June 15, remained in this stage 

 only 10 to 15 days. (See Table VI.) The average for the entire 

 spring brood of pupae was 26.02 days. 



Table VI. — Length of pupal stage of the spring brood, Douglas, Mich., 1010. 



