Group Title: Press bulletin
Title: A new white fly fungus
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Permanent Link: http://ufdc.ufl.edu/UF00090405/00001
 Material Information
Title: A new white fly fungus
Series Title: Press bulletin
Physical Description: 2 leaves : ; 21 cm.
Language: English
Creator: Fawcett, H. S ( Howard Samuel ), b. 1877
University of Florida -- Agricultural Experiment Station
Publisher: Florida Agricultural Experiment Station
Place of Publication: Gainesville
Publication Date: 1907
 Subjects
Subject: Citrus -- Diseases and pests -- Control -- Florida   ( lcsh )
Citrus whitefly -- Control -- Florida   ( lcsh )
Genre: government publication (state, provincial, terriorial, dependent)   ( marcgt )
non-fiction   ( marcgt )
 Notes
Statement of Responsibility: by H.S. Fawcett.
General Note: Caption title.
General Note: "October 14, 1907."
 Record Information
Bibliographic ID: UF00090405
Volume ID: VID00001
Source Institution: University of Florida
Holding Location: University of Florida
Rights Management: All rights reserved by the source institution and holding location.
Resource Identifier: oclc - 80210901

Full Text



PRESS BULLETIN No. 68.


florida Agricultural Experiment Station.


A NEW WHITE FLY FUNGUS.

BY H. S. FAWCETT.

A new fungus that gives promise of being very effective in killing
the larvae of the White Fly has recently been discovered. It was found
by Prof. P. H. Rolfs in two different groves in the Sub-Peninsula. At-
tention was called to it from the fact that 70 to 90 per cent. of the
larvae in recently infested trees were found to be dead. This led to
further investigation as to the cause of the mortality of the White Fly
larvae, with the result that a fungus, not heretofore noticed, was found.
On leaves sent in later from one of the same groves, almost every larva
had been killed. The same fungus was found to be present on White
Fly larvae sent in on citrus leaves from the Manatee River region a
few days later.

NAME AND APPEARANCE OF THE FUNGUS.
This new White Fly parasite, which may be called the "WHITE
FRINGE" FUNGUS, appears to belong to a genus known scientifically
as Microcera. It is related to the Red Headed fungus (Sphaerostilbe
coccophila) that is parasitic on San Jose Scale and on various citrus
scale insects, but its general appearance is very different.
The White Fringe fungus is not at all conspicuous to the unaided
eye, as are the Red, Yellow and Brown fungi, but under the hand lens
it may be made out. It appears as a very delicate white fringe coming
out from the margin of the larva. If the leaves are picked and allowed
to dry the fringe disappears. The dead larvae become white and
papery, and later often present a very slight pinkish appearance.

EXPERIMENTAL EVIDENCE.
Our experiments, conducted at Gainesville, showed that in two
weeks from the time the spores were introduced into white fly infested
trees, the fungus was very evident upon previously healthy white fly


October 14, 1907.











larvae. Additional experiments in the laboratory showed that the spores
of the White Fringe fungus germinate much more quickly than those
of either the Red or the Yellow fungus.
How far the use of this fungus will prove to be of practical value
in controlling the White Fly is yet to be determined by further experi-
ment on a larger scale. If, however, the fungus continues to be as
active as it has recently shown itself to be, it will certainly prove of
great value in further checking the ravages of this troublesome pest.

HOW TO USE THE FUNGUS.

Persons finding this fungus in parts of their groves, can distribute
it into portions of the grove in which the White Fly is perfectly healthy,
by taking leaves containing larvae already infested with fungus, and
pinning them into trees where the larvae are not yet diseased. In
doing this we would advise that the fungus-containing surface of the
detached leaves be pinned in contact with the healthy larvae of the
others.

State papers please copy.




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