CONTENTS. 
Page. 
Introduction 9 
Economic importance fc ... 9 
Life history 10 
The egg 10 
Description 10 
Where laid ,..'. 10 
Incubation 10 
The larva and nymph 11 
Descriptive 11 
Length of stages 11 
The adult 12 
Description 12 
Copulation 12 
Parthenogenesis 12 
Habits 13 
Habitation 13 
Protection 13 
Hibernation 13 
Locomotion 14 
Emergence from hibernation 15 
First appearance of mites on hops 15 
Migratory activities 15 
Food plants 16 
Nature of damage 17 
General effect of mites upon foliage 17 
Relative effect of mites upon male and female hopvines 17 
Effect upon the quality of the hops 17 
Effect upon man 18 
Distribution in the field. 18 
Predaceous enemies 19 
Experiments for the control of the red spider 20 
Methods of experimentation 20 
Tag counts 20 
Field counts 20 
Sulphur 20 
Reason for inefficiency ,. 22 
Lime-sulphur solutions. 22 
Flour paste 24 
Lye-sulphur 25 
Nicotine solutions and other materials 25 
Pure water 26 
Value of second application 26 
Formulas for sprays 27 
Banding with tanglefoot 28 
Application 28 
Methods of applying sprays 29 
Cost of spraying 30 
5 
