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INHS Bulletin vol.21:7PDF


Title:A Needle Blight of Austrian Pine
Author(s):Hulbary, Robert L.
Abstract: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.
Issue Date:1941-06
Publisher:Champaign : Illinois Natural History Survey
Series/Report:Illinois Natural History Survey Bulletin; v. 021, no. 07
Publication Status:published or submitted for publication
Peer Reviewed:is peer reviewed
Rights Information:Copyright 2009 University of Illinois Board of Trustees. All rights reserved.
Date Available in IDEALS:2013-06-05

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