U. S. D. A., B. E. Bill. f)4, Part VIII. Issued May 7, 1910. 



SOME MISCELLANEOUS RESULTS OF THE WORK 

 OF THE BUREAU OF ENTOMOLOGY-L\. 



THE WOOLLY WHITE-FLY: A NEW ENEMY OF THE FLORIDA 



ORANGE. 



{Aleyrodes hotvardi Quaintance.) 



By E. A. Back, Ph. D. 

 Agent and Expert. 



INTRODUCTION. 



The attention of entomoloi^ists is called, for the first time, to the 

 discovery in this countiy of a new species of Aleyrodes which attacks 

 citrus trees. In view of the widespread havoc played among the 

 orange groves of Florida by the citrus white-fly (Aleyrodes citri Riley 

 and Howard) and the spotted-wing white-fly (Aleyrodes nuhifera 

 Berger), the appearance among the orange trees at Tampa of another 

 aleyrodid which has already demonstrated itself to be of economic 

 importance is of interest, if not, indeed, a subject for considerable 

 concern. 



During a recent examination of orange trees along several of the 

 streets in the business section of Tampa in connection with govern- 

 ment white-fly investigations that are being carried on in Florida by 

 the Bureau of Entomology, the attention of the writer was attracted 

 to dense white and grayish woolly secretions on the under surface of 

 many leaves. At first this was supposed to be a heavy infestation of 

 the ratlier scarce Paraleyrodes perseie Quaintance, but on closer exami- 

 nation proved to be Aleyrodes howardi Quaintance, up to the present 

 time known only to infest orange trees on several of the West Indian 

 islands, especially Cuba. 



INJURY AND EXTENT OF INFESTATION. 



At present very little is known of the caj)acity for injury possessed 

 by this aleyrodid. Mr. C. L. Marhitt, Assistant Chief of the Bureau 

 of Entomology, found it (|uite a])undant, locally, on several of tlio 

 old orange trees at Artimisa, Cuba, but at that time (li)Oo) noted 



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