A Comparative Study of Two Components of the Poinsettia Root Rot Complex
Perry, Robert S.
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https://hdl.handle.net/2142/44075
Description
Title
A Comparative Study of Two Components of the Poinsettia Root Rot Complex
Author(s)
Perry, Robert S.
Issue Date
1971-08
Keyword(s)
Poinsettia
Root Rot
Fungus
Abstract
THE MOST IMPORTANT pathological
problem encountered by commercial
growers of poinsettias ( Euphorbia
piilcheirima Willd. ) is caused by
a complex of fungi composed of Thielaviopsis
basicola (Berk. & Br.) Ferr.,
Rhizoctonia solani Kuhn, and Pythium
ultimum Trow. Collectively these three
organisms cause a condition referred
to as the poinsettia root rot complex. Since more research has been conducted
on P. ultimum and R. solani
than on T. basicola, the present research
was originally designed to investigate
some of the environmental factors
affecting the growth of Thielaviopsis
and the development of the root rot
caused by it. However, another fungus,
Chalaropsis thielavioides Peyronel, frequently
was obtained in isolations from
diseased greenhouse poinsettias. Since
C. thielavioides had not been reported
as being a part of the poinsettia root
rot complex, the author decided to investigate
its importance as a pathogen
on poinsettias. Numerous similarities
between C. thielavioides and T. basicola
were evident. The object of this
work was to compare the two fungi.
Prior to undertaking such a study, the
pathogenicity of Chalaropsis on poinsettias
had to be established. A comparison
of Chalaropsis and two isolates
of Thielaviopsis was made to determine
the effects of environment on the
growth of the fungi and the ability of
the two fungi to produce disease symptoms
on poinsettias.
Publisher
Champaign : Illinois Natural History Survey
Series/Report Name or Number
Illinois Natural History Survey Bulletin; v. 030, no. 07
ISSN
0073-4918
Type of Resource
text
Language
en
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http://hdl.handle.net/2142/44075
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