C X T 1: X T S . 
Page. 
Introduction 9 
Systematic position 10 
Names of the insect 11 
Popular names 11 
Scientific names 11 
Varieties of the codling moth II 
Geographical distribution 13 
Relation of distribution to life zones 14 
Boreal zone 14 
Transition zone 14 
Upper Austral zone 15 
Lower Austral zone 15 
Immune regions 16 
Means of spread 16 
Estimated losses 17 
Food habits _ 18 
Fruits infested 18 
Nut-feeding hal )its 19 
Leaf-feeding habits 19 
Primitive food habits 21 
AVork of other insects 21 
Life history 24 
The egg , 24 
Places where laid 25 
When [He eggs are laid 26 
The number of eggs laid by one female 26 
The egg-laying period 27 
Duration of <^'^^ stage . 27 
Hatching of the egg 2S 
Changes during incubation 28 
Methods of obtaining eggs 29 
Influence of temperature upon the length of the egg stage 29 
Mortality among the eggs oO 
The larval stage ,S0 
Description of full-grown Vwwv \\\ 
Entering the fruit \\\ 
Places of entrance 82 
Time spent in the fruit .S4 
Preparations for leaving the fruit \\\ 
Leaving the fruit \\\ 
Places of spinning cococ^ns :i5 
Description of the cocoon ;^6 
