24 



DECIDUOUS FRUIT INSECTS AND INSECTICIDES. 



Table XXV. — Incubation period of eggs of the second brood in rearing cages, Douglas, 

 Mich., 1910; summary of Table XXIV. 



Appearance of 



Appearance of 



Total incubation 



red ring. 



black spot. 



period. 



Number 



Number 



Number 



Number 



Number 



Number 



of 



of obser- 



of 



of obser- 



of 



of obser- 



days. 



vations. 



days. 



vations. 



days. 



vations. 



2 



10 



4 



7 



6 



13 



3 



19 



5 



19 



7 



14 



4 







6 



8 



8 



9 



5 



9 



7 



9 



9 



6 



6 



2 



8 



2 



10 

 11 



3 

 1 











SECOND BROOD OP LARVAE. 



Time of hatching. — The time of hatching of second-brood larvae 

 under orchard conditions has been determined by methods described 

 on page 14 for the first brood. A maximum abundance of newly 

 hatched larvae occurred about September 10. The earliest larva of 

 the brood hatched August 12. In the cages several late-deposited 

 eggs failed to hatch, and it is possible that eggs in the field at this 

 time would likewise remain undeveloped. 



Table XXVI. — Length of feeding of second-brood larvae, Douglas, Mich., 1910. 



6 



Date of— 





s 



Date of— 





3 

 o 



Date of— 











si 









bib 







bi 



o3 







Pj 



"o3 







3 



03 



> 



1 





C 



> 



u 



s 





0> 



,d 



1 



© 







9 



1 





,3 



1 



si 







m 



ti 



+J 





£2 



bi 







,Q 



d 



tsfi+j 





X2 



a 



W)+J 





o 



a 



M+a 









C -n 



o 



O 





C ■' H 



o 









o 





3 



.3 3 







a 



■3 3 







3 



.9 '3 





O 



-2 



>& 



>> 



O 



o 



&- 



>> 





o 



>a 



>> 



6 



03 



<D 



o3 



6 



"o3 





03 



d 



<s 





03 



£ 



w 



ft 



ft 



£ 



w 



ft 



ft 



£ 



W 



ft 



ft 



1 



Aug. 15 



Sept. 12 



28 



28 



Aug. 19 



Oct. 1 



43 



55 



Aug. 24 



Oct. 1 



38 



2 



...do 



Sept. 13 



29 



29 



Aug. 20 



Sept. 24 

 ...do 



35 



56 



...do 



...do 



38 



3 



...do 



...do 



29 



30 



...do 



35 



57 



...do 



Oct. 2 



39 



4 



...do 



...do 



29 



31 



Aug. 21 



Sept. 15 



25 



58 



...do 



...do 



39 



5 



...do 



Sept. 15 



31 



32 



...do 



Sept. 20 



30 



59 



Aug. 25 



Sept. 15 



21 



6 



Aug. 17 



Sept. 20 



34 



33 



...do 



Sept. 21 



31 



60 



...do 



Sept. 27 



33 



7 



...do 



Sept. 24 



38 



34 



...do 



Sept. 22 



32 



61 



...do 



Oct. 1 



37 



8 



...do 



...do 



38 



35 



...do 



Sept. 23 



33 



62 



Aug. 26 



Oct. 2 



37 



9 



...do 



Oct. 1 



45 



36 



...do 



Sept. 24 



34 



63 



...do 



Oct. 3 



38 



10 



Aug. 18 



Sept. 23 



36 



37 



Aug. 22 



Sept. 12 



21 



64 



...do 



...do 



38 



11 



...do 



Sept. 24 



37 



38 



...do 



...do 



21 



65 



...do 



Oct. 7 



42 



12 



...do 



...do 



37 



39 



...do 



Sept. 23 



32 



66 



Aug. 28 



Sept. 24 



27 



13 



...do 



Sept. 28 



41 



40 



...do 



...do 



32 



67 



...do 



Oct. 3 



36 



14 



...do 



Oct. 1 



44 



41 



...do 



...do 



32 



68 



...do 



...do 



36 



15 



Aug. 19 



Sept. 12 

 ...do 



24 



42 



...do 



Sept. 26 



35 



69 



...do 



...do 



36 



16 



...do 



24 



43 



Aug. 23 



Sept. 23 

 ...do 



31 



70 



...do 



Oct. 4 



37 



17 



...do 



Sept. 15 



27 



44 



...do 



31 



71 



...do 



...do 



37 



18 



...do 



...do 



27 



45 



...do 



Oct. 1 



39 



72 



...do 



Oct. 6 



39 



19 



...do 



Sept. 20 



32 



46 



...do 



...do 



39 



73 



...do 



...do 



39 



20 



...do 



...do 



32 



47 



...do 



Oct. 3 



41 



74 



Aug. 29 



Oct. 10 



42 



21 



...do 



...do 



32 



48 



Aug. 24 



Sept. 21 



28 



75 



Aug. 30 



Sept. 25 



26 



22 



...do 



Oct. 1 



43 



49 



...do 



Sept. 23 



30 



76 



...do 



Sept. 29 



30 



23 



...do 



...do 



43 



50 



...do 



...do 



30 



77 



Aug. 31 



Oct. 4 



34 



24 



...do 



...do 



43 



51 



...do 



Sept. 24 



31 



78 



...do 



Oct. 6 



36 



25 



...do 



...do 



43 



52 



...do 



Sept. 25 



32 



79 



...do 



...do 



36 



26 



...do 



...do 



43 



53 



...do 



...do 



32 



80 



Sept. 3 



Oct. 1 



28 



27 



...do 



...do 



43 



54 



...do 



...do 



32 



81 



Sept. 4 



Oct. 6 



32 



Averapp. 





34.2 



Ma 



ximum . . 



















45 

 21 



Mil 



limum . . . 







































