THE WHITE-FKINGE FUNGUS. 33 
bodies. Those desiring a fuller description are referred to Press 
Bulletin 68, issued October 14, 1907, by the Florida Agricultural 
Experiment Station, by Prof. H. S. Fawcett, in which appears the 
original description. In June, 1908, Prof. Fawcett 1 published a 
more technical description, together with data on successful cultural 
methods and introductions secured in the field with artificially grown 
cultures. The apparent effectiveness of this fungus and methods of 
introducing it are discussed by Dr. Berger 2 in a publication bearing 
the date of February, 1909. 
The authors' experiences with this fungus date from the fall of 1906. 
Under date of November 26 of that year the senior author noted the 
presence at Orlando, in a grove infested with the cloudy- winged 
white fly, of an " unknown pink fungus especially prevalent on pupae 
killed by a spray." While no data as to the relative abundance of 
infected pupae on the sprayed and unsprayed trees were collected, the 
number of infected specimens on the sprayed trees was unmistakably 
greater. Examinations made showed that from November 26 to 
December 10 there was no spread of fungus to previously marked 
healthy pupae from infected pupae touching them. Later in the same 
year this fungus was seen at Hawthorn developing upon the citrus 
white fly. Under date of August 27, 1907, Mr. Worsham reported the 
Microcera quite abundant in Manatee, Hillsboro, and Orange Counties, 
saying that at that time it was present in greater abundance in every 
grove visited in Manatee County than on July 19. Under the same 
date Mr. Worsham reported it very abundant in the groves of Mr. 
F. L. Wills and Mr. C. W. Hicks, at Sutherland, and in several groves 
at Orlando. On November 1, 1907, an examination of leaves from 
Mr. Hicks's grove gave the following results : Flies reaching maturity 
and emerging, 46.8 per cent: living larvae and pupae, 4.9 per cent; 
dead larvae and pupae, 4.2 per cent; dead larvae and pupae infected 
with the white-fringe fungus, 44 per cent. Under date of Novem- 
ber 11, 1907, a grower at Largo reported that this fungus had killed 
95 per cent of the fly in his grove, but an actual count of the leaves 
sent to the Orlando laboratory with this statement showed that 12.9 
per cent had reached maturity and had emerged, 52.7 per cent were 
still alive on the leaves, and 34.3 per cent were dead from fungus and 
unexplained mortality, no attempt being made to find the percentage 
of wlrite-fringe fungus, which was noted as being very slight. 
On October 3, 1907, many pupae of Aleyrodes nubifera were killed 
by mechanical injuries in applying as a smear a culture of yellow 
Aschersonia; on October 31 the junior author noted that many pupae 
had been killed by the application of the culture, and on November 
i Fungi parasitic upon Aleyrodes citri. Univ. of State of Florida, Special Studies, No, 1. 
2 Bui. 97, Fla. Agr. Exp. Sta., pp. 54-55. 
21958°— Bull. 102—12 3 
