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 tins 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, 

 while later larvae, 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., 1910. 





Date of— 







Date of— 





No. of 









No. of 









obser- 







Days. 



obser- 







Days. 











vation. 



Pupation. 



Emergence. 





vation. 



Pupation. 



Emergence. 





1 



Apr. 15 



June 13 



59 



54 



May 25 



June 22 



28 



2 



Apr. 30 

 May 6 



June 15 



46 



55 



...do 



...do 



28 



3 



June 17 



42 



56 



...do 



...do 



28 , 



4 



May 19 



June 18 



30 



57 



...do 



...do 



28' -i 



5 



...do. 



June 19 



31 



58 



...do 



June 23 



29 



6 



...do 



...do 



31 



59 



May 26 



June 22 



27 



7 



...do 



June 20 



32 



60 



...do 



...do 



27 



8 



May 20 



...do....... 



31 



61 



...do 



June 23 



28 



9 



May 21 



June 18 



28 



62 



May 27 



June 22 



26 



10 



...do 



June 19 



29 



63 



...do 



...do 



26 



11 



...do 



June 20 



30 



64 



May 28 



...do 



25 



12 



...do 



...do 



30 



65 



...do 



...do 



25 



13 



...do 



...do 



30 



66 



...do 



...do 



25 



14 



...do 



...do.. 



30 



67 



...do 



June 23 



26 



15 



...do 



...do 



30 



68 



...do 



...do 



26 



16 



...do 



...do 



30 



69 



...do 



...do 



26 



17 



...do 



...do 



30 



70 



...do 



...do 



26 



18 



...do 



June 21 



31 



71 



...do 



...do 



26 



19 



...do 



...do 



31 



72 



May 29 



June 19 



21 



20 



...do 



...do 



31 



73 



...do 



June 23 



25 



21 



...do 



...do 



31 



74 



...do 



...do.: 



25 



22 



...do 



...do 



31 



75 



...do 



...do.. 



25 



23 



...do 



...do 



31 



76 



...do 



...do 



25 



24 



...do 



...do 



31 



77 



May 31 



...do 



23 



25 



...do 



...do 



31 



78 



...do 



...do 



23 



26 



...do 



June 22 



32 



79 



June 1 



...do 



22 



27 



...do 



June 24 



34 



80 



June 2 



...do 



21 



28 



May 22 



June 21 



30 



81 



...do 



June -24 



22 



29 



...do 



...do 



33 



82 



June 3 



June 23 



20 



30 



...do 



...do 



30 



83 



...do 



June 24 



21 



31 



...do 



...do 



30 



84 



June 4 



June 23 



19 



32 



...do 



...do 



30 



85 



June 5 



...do 



18 



33 



...do 



...do 



30 



86 



...do 



...do 



18 



34 



...do 



...do 



30 



87 



June 6 



...do 



17 



35 



...do 



...do 



30 



88 



June 7 



June 24 



17 



36 



...do 



...do 



30 



89 



...do 



...do 



17 



37 



...do 



...do 



30 



90 



June 8 



...do 



16 



38 



...do 



June 22 



31 



91 



June 9 



June 25 



16 



39 



...do 



June 23 



32 



92 



June. 10 



June 20 



10 



40 



...do _ 



...do 



32 



93 



...do 



June 24 



14 



41 



May 23 



June 21 



29 



94 



...do 



June 25 



15 



42 



...do 



...do 



29 



95 



...do 



June 26 



16 



43 



...do 



...do 



29 



96 



June 12 



...do 



14 



44 



...do 



June 22 



30 



97 



...do 



June 27 



15 



45 



...do 



...do 



30 



98 



...do 



...do 



15 



46 



...do 



...do 



30 



99 



June 13 



...do 



14 



47 



...do 



...do 



30 



100 



June 14 



June 28 



14 



48 



...do 



...do 



30 



101 



...do 



June 29 



15 



49 



...do 



...do 



30 



102 



June 15 



June 28 



13 



50 



...do 



...do 



30 



103 



...do 



June 29 



14 



51 



May 24 



...do...... 



29 



104 



June 17 



July 2 



15 



52 



...do 



...do 



29 



105 



June 19 



June 29 



10 



53 



Avei 



...do 



-age 



June 28 



35 



106 



June 23 



July 8 



15 



26.^2 



Max 

 Mini 



imum 





59 

 10 



mum 

















