THE WHITE-FRINGE FUNfiUS. 33 



bdcHos. Those dcsiriiif; a fuller tloscription are referred to Press 

 liullotin 68, issued October 14, 1907, by tlie Florida Agricultural 

 Experiment Station, b}^ Prof. II. S. Fawcett, in wiiicli appears the 

 original descrij^tion. In June, 1908, Prof. Fawcett* 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 fimgus and methods of 

 introducing it are discussed by Dr. Berger - in a publication bearing 

 the date of February, 1909. 



The authors' experiences \nth 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-wdnged 

 white fly, of an ''unknown pink fungus especially ])revalent on pupee 

 killed by a spray." While no data as to the relative abundance of 

 infected pupae on the spra5'ed and unsprayed trees wei-e collected, the 

 number of infected specimens on the sprayed trees >vas unmistakably 

 greater. Examinations made showed that from November 26 to 

 December 10 there was no spread of fungus to previously marked 

 healthy pupse from infected })up0e 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, 

 sapng 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 groA*es of ISLc, 

 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 larA^ae 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 laborator}^ 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 w^ere dead from fungus and 

 unexplained mortality, no attempt being made to find the percentage 

 of wiiite-fringe fungus, wiiich was noted as being very slight. 



On October 3, 1907, many pupae of Aleyrodes nuhifera vrere kjdled 

 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 



1 Fungi parasitic upoa Aleyrodes cilri. Univ. of State of Florida, Special Studies, No. 1. 

 > Bui. 97, Fla. Agr. Exp. Sta., pp. 54-55. 



21958°— Bull. 102—12 3 



