8 DECIDUOUS FRUIT INSECTS AND INSECTICIDES 
TaBLeE VII.—First-brood eggs—incubation records of eggs laid in Cages I and ITI (recorded 
in Tables Vand VI). 
A. 21 EGGS LAID IN CAGE I. 
When 
Number - Red ring ne When | Length of 
of eggs. (night). appeared. appeared. hatched. | egg stage. 
Days 
2 Apr. 19 | Apr. 27] May 4] May 6 17 
5 #. SdOesees|-dO-s--s May 5| May 8 19 
11 Ee Osseee |p =a dOeee=- |b eG Opeeee May 9 20 
3 pa fdO¥s 222 |. 2 -C0nees|aeeGOssaas May 10 21 
B. 46 EGGS LAID IN CAGE I. 
1 Apr. 24 | May 2/| May 10] May il 16 
2 do adOer - 24 May 9| May 12 17 
6 do mG Onecen May 10)|3- .doe---- 17 
30 do <= d0n25-\- May 11)|---do.-.22 17 
4 doss-- May 3) |--2d0--..- .-do 17 
1 ox..2 May, (2a adorns. May 13 18 
1 Gorse: Maiyarom| ieeceaeia se May 14 19 
C. 16 EGGS LAID IN CAGE II. 
cs Pra? fone | 
D. 45 EGGS LAID IN CAGE II. 
| 16 Mas (ea eee 
May 17 
Ay ca Msy 0) eats, cobalt tte, Mos aig eeee 
a.m. 
FIRST-BROOD LARVZ. 
Period of hatching.—The date of the earliest hatching of larvee 
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. Larve 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 larve 
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 24 months for the wintering larve to pupate, the spring moths 
issued within a space of 2 months and the first brood of larvee hatched 
in scarcely more than 45 days. This is readily explainable from the 
influence of temperature on the different stages. The earliest spring 
