CONTENTS 



Page. 



Tntroduction 9 



Systematic position 10 



Names of the insect 11 



Popular names 11 



Scientific names 11 



Varieties of the codling moth 11 



(reographical 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 habits 19 



Leaf-feeding habits 19 



Primitive food habits 21 



Work of other insects 21 



Life history 24 



The egg , 24 



Places where laid 25 



When ttie eggs are laid 26 



The number of eggs laid by one female 26 



The egg-laying period 27 



Duration of egg stage 27 



Hatching of the egg 28 



Changes during incubation 28 



Methods of obtaining eggs 29 



Influence of temperature upon the length of the egg stage 29 



Mortality among the eggs 30 



The larval stage 30 



Description of full-grown lar^•;^■ 31 



Entering the fruit 31 



Places of entrance 32 



Time spent in the fruit 34 



. Preparations for leaving tlie fruit 34 



Leaving the fruit 34 



Places of spinning cocoons 35 



Description of the cocoon 36 



5 



