18 



DECIDUOUS FRUIT INSECTS AXD INSECTICIDES. 



Table V gives the emergence of rnotlis from a quantity of overwin- 

 tering material kept at San Jose, Cal. The emergence record is shown 

 graphically in figure 6. 



Table V. — Emergence of moths of the spring brood, San Jose. Cal.. 1909. from over- 

 wintering larvae collected on banded apple trees. 



Date of emer- 

 gence. 



Num- 

 ber of 

 moths. 



Date of emer- 

 gence. 



Num- 

 ber of 

 moths. 



Date of emer- 

 gence. 



Num- 

 ber of 

 moths. 



Date of emer- 

 gence. 



Num- 

 ber of 

 moths. 



Apr. 27 



28 



30 



May 1 



9 



3 



5 



1 



9 



36 



34 



25 



Mav 4 



7 



8 



9 



30 

 36 

 34 

 23 



20 



May 10 



11 



12 



13 



14 



47 

 11 

 20 

 10 

 14 



Mav 15 



16 



17 



Total.... 



24 

 23 



24 



426 



THE FIRST GENERATION. 



FIRST-BROOD EGGS. 















































































































*»»■ 







































^•s 



V 





/ 





**H 



V 





































\ 



/ 









\ 















































\ 



s. 



1 











/ 



■■» 



^ 





































/ 



\ 





/ 









































/ 



\ 



/ 



f 







































































































2S 27 28 30 



/ 2 3 4- 5 G 7 e 3 /O // /2 /3 A? /5 '€ /7 /& 



Time of oriposition. — Xo eggs were laid in breeding cages in 1909 

 until May 7, but numerous eggs were found in the orchard on May 5, 



50 

 45 

 40 

 35 

 30 

 25 

 20 

 /5 

 /O 



5 



O 



Fig. 6. — Weekly emergence of codling mothsfrom overwintered material at San Jose, Cal., 1909. (Original.) 



18 of which were collected, mostly showing black heads of larvae. 

 These were carried to the laboratory and kept out of doors, the first 

 hatching May 7; 14 more had hatched by May 15; the others failed 

 to hatch. On May 11 eggs were numerous on the fruit and foliage in 

 the field, and 8 recently hatched larvae were found on two trees near 

 the packing shed. As the average period of incubation was about 

 21 days at this time, the approximate date for first oviposition in the 

 field would be April 15. Since practically all moths in the field had 

 emerged by May 6, it is not probable that any eggs were deposited in 

 the field after May 15. The last eggs were secured in cages at the 

 laboratory on May 12. Although many moths emerged after this 

 date in the glass jars, very few were alive at any one time. 



Corresponding with the time of emergence of moths, eggs were 

 deposited earlier in 1910 than was the case in 1909. On April 25 at 



