CONTENTS. 



ENTOMOLOGY 

 UBfiABY 



PAGE. 



I. INTRODUCTION 5 



Statement of Work on Which the Thesis is Based 777 . . . ,-rv . . , 5 



Historical Review of Entomogenous Fungi 5 



Historical Review and Economic Status of Aleyrodes citri R. & H 8 



II. ASCHERSONIA ALEYRODIS WEBBER 10 



Discovery and Description 10 



History 10 



Methods of Introduction 11 



Germination of Conidia 12 



Cultures 13 



Infection of Aleyrodes citri from Cultures 16 



Distribution 17 



III. ASCHERSONIA FLAVO-CITRINA P. HENN 11 



Discovery and Description 11 



Comparison with A. aleyrodis 18 



Cultures 18 



Germination of Conidia 39 



Super-parasite 21 



List of Localities in Florida 21 



IV. VERTICILLIUM HETEROCLADUM PENZ 21 



Discovery and History 21 



Description 22 



Cultures 23 



Germination of Conidia 24 



Infection of Aleyrodes citri from Cultures 24 



List of Insects Parasitized, with Localities 25 



V. Sl'H AEROSTILBE COCCOPHILA Tui 25 



Description 25 



History 26 



Relation to San Jose and Other Scale Insects 27 



Parasitism on Aleyrodes citri 28 



List of Insects Parasitized, with Localities 29 



VI. M ICROCERA SP 29 



Technical Description ' 29 



Discovery 30 



Cultures 30 



Infection of Aleyrodes citri from Cultures 32 



Germination of Conidia 33 



Variation in size of Conidia 33 



Distribution in Florida 34 



VII. THE "BROWN FUNGUS" 34 



Discovery 34 



Description by Webber 34 



Brown fungus of Parkin 35 



Methods of Introduction 35 



Distribution 36 



SUPPLEMENTARY NOTES 36 



SUMMARY ?>1 



BIBLIOGRAPHY :58 



EXPLANATION OF PLATES.. 41 



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