CONTENTS 
Page. 
Historical 11 
Losses due to the sugar-beet wireworm 11 
Insects found with the sugar-beet wireworm 12 
Classification, synonymy, and common names 13 
Descriptions 14 
The adult 14 
The egg 14 
The larva 14 
The pupa 15 
Distribution • 16 
Food plants 16 
Life history and habits 18 
The egg 18 
Time and place of deposition 18 
Number and hatching of eggs 19 
Length of egg stage 20 
The larva 20 
Emergence from the egg 20 
The newly hatched larva 20 
Rearing cages used 21 
Habits of the young wireworms 22 
Approximate length of larval stage 24 
Habits of the older wireworms 25 
Location of food by the wireworms 25 
Activity of the wireworms 26 
Wireworm injury to beets 26 
Time the wireworms can live without food 27 
Relation between injury in the beet fields and the size and al)undance 
of wireworms 29 
Molting of the wireworms 29 
The pupa 30 
Pupation 30 
The pupal cell 30 
Soil conditions affecting pupation 30 
Vitality of the pupa 31 
Changes in color of the pupa 31 
Length of the pupal stage 31 
The adult 32 
Emergence of the adult 32 
Period of emergence 32 
Actions directly after emergence 32 
Appearance of beetles in the spring 33 
Beginning of the period of activity 33 
Variation in the size of l:)eetles 34 
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