U. S. D. A., B. E. Bui. 64, Part VIII. Issued May 7. 1910. 



SOME MISCELLANEOUS RESULTS 0E THE WORK 

 OF THE BUREAU OF ENTOMOLOGY-IX. 



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



ORANGE. 



(Aleyrodes howardi Quaintance.) 



.By E. A. Back, Ph. D. 

 Agent and Expert. 



INTRODUCTION. 



The attention of entomologists is called, for the first time, to the 

 discovery in this country 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 nubifera 

 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 rather scarce Paraleyrodes persea 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 capacity for injury possessed 

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



of Entomology, found it quite abundant, locally, on several of the 



old orange trees at Artimisa, Cuba, but at that time (1905) noted 



