OVER a period of years, blighted
needles of ornamental pines have
constituted an important part of
the diseased evergreen samples received by
our laboratory for diagnosis. Needle blight
is a well-known and widespread type of
pine injury. It has been attributed to such
environmental factors as frost, heat, intense
sunlight, wind burning and drought,
alone and in various combinations. Also,
it has been attributed to the attack of
certain fungi which have been classified
chiefly in the genus Septoria. In the case
of many of the samples submitted to us,
however, it has been impossible to attribute
the injury to any obvious cause or. when
a fungus was present, to assign this fungus
accurately to any described form.
Late in the fall of 1938, badly blighted
needles of Pinus nigra Arn. var. austriaca
Aschers. & Graebn. were obtained in
northern Illinois. Superficially these needles
appeared to have been injured by insects,
for some of them seemed to have
been punctured and there was oozing of
resin near the bases of the blighted regions.
Microscopic examination of transverse
sections of these needles revealed,
however, that the punctures were small
epidermal ruptures due to the development of young fungous stromata. Since
I
none of these stromata were mature, a
method of wintering the infected material
was devised, so that the needles could be
examined periodically and the development
of the fungus studied in detail.
Publisher
Champaign : Illinois Natural History Survey
Series/Report Name or Number
Illinois Natural History Survey Bulletin; v. 021, no. 07
ISSN
0073-4918
Type of Resource
text
Language
en
Permalink
http://hdl.handle.net/2142/44856
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