34 



NATUBAL CONTKOL OF WHITE FLIES IN FLOEIDA. 



11 that these same dead pupae had developed the characteristic 

 growth known as white- fringe fungus. During 1908 and the summer 

 of 1909 the authors found the fungus in every grove visited in various 

 parts of the State. 



Since the observations made on November 26, 1906, this fungus 

 has been regarded by the authors as entirely or largely saprophytic, 

 and all data and observations since obtained have strengthened this 

 belief. Three series ©f observations have been conducted in connec- 

 tion "wdth fumigation experiments. The data obtained are presented 

 in Tables VII and VIII. Specimens of the fungus under observation 

 were submitted to Prof. H. S. Fawcett, who verified the authors-' 

 determination of the species. The data in Table VI are based upon 

 the examination, by the senior author and Mr. W. W. Yothers, of 

 leaves picked promiscuously from adjoining fumigated and unfumi- 

 gated rows of nursery trees. The trees were fumigated on September 

 26, 1908, and the examination was made on October 8, 1908. 



Table VI. — Relative ahundancc of uhite-fringe fungus on fumigated and unfumigated 



leaves. 



Leaves. 



Unfumigated. 

 Fumigated... 



Number 

 of leaves 

 exam- 

 ined. 



Live 

 pupse. 



2,154 

 19 



Dead 

 pupae. 



1,031 

 4,432 



Pupse infected with white- 

 fringe fungus. 



Total. 



29 

 302 



Average 

 per leaf. 



Per cent. 



1.4 

 15.1 



0.9 



6.8 



In Table VII are given data collected by Mr. Yothers showing the 

 development of the fungus over a period of one month on fumigated 

 leaves, as compared mth the same on unfumigated leaves. Five 

 selected leaves were under observation in each case. 



Table VII . — Development of white-fringe fungus on fumigated and unfumigated leaves. 



1 Leaves 1 to 3 on one nursery tree with a total of 400 dead and 2 living pupce. I>eaf No. 4 on similar tree 

 and with same number dead and living pupse. Leaf No. 5 on similar tree but with 1 living and 400 dead 

 pupae. 



2 Leaves 6 to 10 with average of about 40 living pupae and numerous dead larvae and pupae per leaf. 



