34 



DECIDUOUS FRUIT INSECTS AND INSECTICIDES. 



tuck orchards, however, were all carefully handled, and the results 

 of these observations show approximately the normal proportion of 

 winter-killed larvae. 



SPRING BROOD OF PUPJE. 



Time of pupation. — In the rearing cages pupation commenced on 

 May 9, reached a maximum May 19, and terminated June 26 (Table 

 XXXII). The relative rate of pupation is illustrated by a curve in 

 figure 12. It will here be observed that pupation occurred rather 

 irregularly and that the time when the larger number of individuals 

 pupated extended over a longer period than in 1910. This, of course, 

 had a direct bearing upon the time and rate of emergence of the 

 moths of the spring brood, which, like the pupae, appeared very 

 irregularly. 



Table XXXIII. — Length of pupal stages of the spring brood, Douglas, Mich., 1911. 



No. 



Pupated. 



Emerged. 



Days. 



No. 



Pupated. 



Emerged. 



Days. 



No. 



Pupated. Emerged. 



Days. 



1 



May 14 



May 29 



u 



42 



May 21 



June 10 



20 



83 



May 29 i June 19 



21 



2 



...do 



...do 



15 



43 



...do 



June 9 



19 



84 



...do do 



21 



3 



...do 



May 30 



16 



44 



...do 



June 10 



20 



85 



May 30 June 20 



21 



4 



May 15 



May 28 



13 



45 



May 22 



June 14 



23 



86 



...do....'. June 18 



19 



5 



....do 



May 30 



15 



46 



...do 



June 11 



20 



87 



...do June 19 



20 



6 



May 16 



...do 



14 



47 



...do 



June 10 



19 



88 



May 31 June 21 



21 



7 



...do 



June 6 



21 



48 



...do 



June 9 



18 



89 



...do ...do 



21 



8 



May 17 



June 2 



16 



49 



...do 



June 10 



19 



90 



...do June 20 



20 



9 



...do 



June 3 



17 



50 



Mav 23 



...do 



18 



91 



...do June 19 



19 



10 



...do 



...do 



17 



51 



...do 



...do 



18 



92 



...do June 20 



20 



11 



...do 



June 10 



24 



52 



...do 



June 11 



19 



93 



June 1 ...do 



19 



12 



...do 



June 2 



16 



53 



...do 



June 10 



18 



94 



June 2 



June 22 



20 



13 



May 18 



June 3 



16 



54 



May 24 



June 6 



13 



95 



...do 



June 21 



19 



14 



...do 



...do 



16 



55 



...do 



June 9 



16 



96 



June 3 



June 22 



19 



15 



...do 



June 6 



19 



56 



...do 



June 10 



17 



97 



...do 



June 21 



18 



16 



...do 



June 4 



17 



57 



...do 



June 11 



18 



98 



June 4 



June 23 



19 



17 



...do 



June 5 



18 



58 



...do 



June 14 



21 



99 



...do 



June 24 



20 



18 



...do 



June 4 



17 



59 



...do 



June 11 



18 



1C0 



June 5 



June 23 



18 



19 



...do 



June 5 



18 



60 



May 25 



June 12 



18 



101 



...do 



...do 



18 



20 



May 19 



June 6 



18 



61 



...do 



June 14 



20 



102 



...do 



June 24 



19 



21 



...do 



June 5 



17 



62 



...do 



...do 



20 



103 



...do 



...do 



19 



22 



...do 



...do 



17 



63 



...do 



June 12 



18 



104 



June 6 



June 23 



17 



23 



...do 



...do 



17 



64 



...do 



June 14 



20 



105 



...do 



June 24 



18 



2-4 



...do 



...do 



17 



65 



...do.... 



June 12 



18 



106 



June 8 



...do 



16 



25 



...do 



June 6 



18 



66 



May 26 



June 16 



21 



107 



June 9 



June 25 



16 



26 



...do 



June 4 



16 



67 



...do 



June 15 



20 



108 



...do 



June 27 



18 



27 



...do 



June 5 



17 



68 



...do 



June 14 



19 



109 



...do 



June 26 



17 



28 ...do 



June 6 



18 



69 



...do 



...do 



19 



110 



...do 



...do 



17 



29 ...do 



June 4 



16 



70 



May 27 



June 15 



19 



111 



June 10 



...do 



16 



30 ...do 



June 7 



19 



71 



...do 



June 16 



20 



112 



...do 



June 27 



17 



31 ...do 



June 6 



18 



72 



...do 



June 19 



23 



113 



...do 



...do 



17 



32 



May 20 



June 9 



20 



73 



...do 



June 15 



19 



114 



...do 



...do 



17 



33 



...do 



June 8 



19 



74 



...do 



June 16 



20 



115 



June 11 



June 30 



19 



31 



...do 



June 9 



20 



75 



May 28 



June 18 



21 



116 



June 13 



...do 



17 



35 



...do 



June 8 



19 



76 



...do 



...do 



21 



117 



June 14 



...do 



16 



36 



...do 



June. 7 



18 



77 



...do 



...do 



21 



118 



...do 



July 8 



24 



37 



...do 



June 8 



19 



78 



...do 



...do 



21 



119 



June 15 



July 2 



17 



38 



...do 



...do 



19 



79 



...do 



June 17 



20 



120 



June 17 



June 30 



13 



39 



May 21 



June 10 



20 



80 



...do 



June 18 



21 



121 



...do 



July 2 



15 



40 



...do 



June 8 



18 



81 



May 29 



...do 



20 



122 



June 21 



July 5 



14 



At 



^~ 



June 10 



20 



82 



...do 



June 19 



21 











41 ...ux> 







Average 



















18. 41 



Maximum 



24 



Minii 



num. 



















13 























