8 DECIDUOUS FRUIT INSECTS AND INSECTICIDES 



Table VII. — First-brood eggs — incubation records of eggs laid in Cages I and II (recorded 



in Tables V and VI). 



A. 21 EGGS LAID IN CAGE I. 



Number 

 of eggs. 



When 



laid 

 (night). 



Red ring 

 appeared. 



Black 



spot 



appeared. 



When 

 hatched. 



Length of 

 egg stage. 



2 



5 



11 



3 



Apr. 19 



...do 



...do 



...do 



Apr. 27 



...do 



...do 



...do 



May 4 

 May 5 



...do 



...do 



Mav 6 

 MaV 8 

 May 9 

 May 10 



Days. 

 17 

 19 

 20 

 21 



EGGS LAID IN CAGE I. 



1 



Apr. 24 



May 2 



Mav 10 i May 11 



16 



2 



...do 



...do 



May 9 Mav 12 



17 



6 



...do 



...do 



May 10 



...do 



17 



30 



...do 



...do 



Mav 11 



...do 



17 



4 



...do 



May 3 



...do 



...do 



17 



1 



...do 



Mav 2 



...do 



Mav 13 



18 



1 



...do 



May 3 





May 14 



19 





C. 16 EGGS LAID IN CAGE II. 



D. 45 EGGS LAID IN CAGE II. 



16 



May 8 







n^ 7 } » 







45 



May 10 





ifMav 17 1 



!l p.m. |l - - 





] Mav 18 j f 



I a.'m. J 



FIRST-BROOD LARV.E. 



Period of hatching. — The date of the earliest hatching of larvae 

 can be put fairly accurately at about April 27 (3 weeks after petals 

 had fallen), as on that day out of 67 eggs collected in the orchard 

 only 6 were empty shells and 2 in the black-spot stage, hatching 

 the same day. No wormy apples were found until May 4, the calyx 

 lobes probably concealing their work for several days. Larvae con- 

 tinued to enter the fruit in numbers during nearly the whole of May. 

 The last of the brood probably entered during the first week of June, 

 which is allowing 10 days from the time of the last observed unhatched 

 egg in the orchard. The great majority of the first brood of larvae 

 entered the fruit during May. 



Thus it will be seen that up to this time the different stages of 

 the insect, instead of showing an increasing tendency to occupy a 

 longer time, have actually become more compact. While it required 

 about 2\ months for the wintering larvae to pupate, the spring moths 

 issued within a space of 2 months and the first brood of larvae hatched 

 in scarcely more than 45 days. This is readily explainable from the 

 influence of temperature on the different stages. The earliest spring 



