CONTENTS. 



Page. 



Introduction 9 



The citrus white fly 9 



General 9 



Description 10 



Distribution in the United States 11 



Injury 11 



Methods of control and their efficiency 12 



Conditions leading to demand for a search for natural enemies of the citrus white 



fly..-.-... 13 



Preparations for the search 14 



Investigations in Europe 15 



Investigations in Ceylon 16 



Investigations in India 17 



General 17 



The botanical gardens 18 



Discovery of the citrus white fly at Saharanpur 19 



Discovery of Cryptognatha flavescens, the lady-beetle enemy of the citrus 



white fly 19 



Discovery of the brown fungus, Mgerita webberi 20 



Searching at Lahore 20 



Discovery of Prospaltella lahorensis, the true internal parasite of the citrus 



white fly 21 



Conclusions drawn from situation at Saharanpur and Lahore 22 



Aleyrodes citri in India 22 



Investigations in Burma, Java, southern China, and the Philippine Islands ... 23 



Further investigations in India 25 



Concentration of efforts at Lahore 25 



Discovery of living parasites 26 



Considerations in collecting and transporting Prospaltella lahorensis 27 



Destruction of young growth of citrus trees by insect pests 27 



Notes on the life history of Aleyrodes citri in northern India 28 



Number of broods of the citrus white fly 29 



The effects of temperature on white-fly development 29 



The effect of humidity on white-fly development 31 



Prospaltella lahorensis, the true internal parasite 34 



Infesting young orange trees with Aleyrodes citri 34 



Cases used in transporting parasites 35 



Cryptognatha flavescens, the predatory enemy of the citrus white fly 36 



Preparation of beneficial insects for shipment 37 



Transporting the natural enemies of the citrus white fly from India to the 



United States 37 



Condition of natural enemies on arrival at Orlando, Fla 38 



Conditions at Orlando, Fla., when the natural enemies arrived 38 



Loss of the natural enemies 38 



The possible efficiency of these natural enemies if established in Florida 39 



5 



