CONTENTS. 
Page. 
Introduction 9 
Species of white flies affecting citrus 10 
The citrus white fly (Aleyrodes citri R. and H.) 11 
Historical review 11 
Origin i 11 
Early history in the United States 12 
Literature 14 
Injury 17 
Nature of injury 17 
Loss of sap 17 
Sooty mold 17 
Extent of injury 19 
Injury to fruit 19 
Injury to trees 23 
Summary of losses 23 
Increased cost of maintenance 24 
Distribution 25 
In the United States 25 
In foreign countries 27 
Food plants 28 
Authentic and questionable records 28 
Economic significance of food plants and interrelationship between 
food plants and insects 31 
Citrus 32 
China trees and umbrella trees 34 
Cape Jessamine 39 
Privet hedges 40 
Japanese and wild persimmons 41 
Lilac 42 
Prickly ash 42 
Coffee 43 
Occasionally infested food plants 43 
Spread in the United States 43 
Checks on successful establishment 43 
Flight of adults 44 
Winds 48 
Vehicles, railroad trains, and boats 48 
Citrus nursery stock and ornamental plants 49 
Accidental spread by man 50 
Life history and habits 51 
Summary 51 
Methods of study 52 
The egg 53 
Description 53 
Duration of egg stage 54 
5 
