AAU-ETD AAU-ETD
 

Addis Ababa University Libraries Electronic Thesis and Dissertations: AAU-ETD! >
College of Education >
Thesis - Business Education >

Please use this identifier to cite or link to this item: http://hdl.handle.net/123456789/22

Title: FUNGI ASSOCIATED WITH SHOOT DIEBACK OF PODOCARPUS FALCATUS
Authors: ABRAHAM, YIRGU
Keywords: Podocarpus falcatus
Alternaria species
Phoma species
Pestalotiopsis
species
Fusarium species
Shoot dieback
Date Added: 31-Aug-2007
Abstract: In Ethiopia, information available on tree disease is limited and scanty. In the field survey conducted in Menagesha-Suba and Munesa-shashemene natural forests the shoot dieback was observed on Podocarpus falcatus. Symptoms were initially observed on leaves and two-three small circular brown spots were found at the very tip of the leading shoot. Gradually the color of the leaves changes into yellow, and to light brown as the shoots die. This symptom of dieback was observed both on seedlings, sapling and mature trees. A study was conducted to understand which fungi was associated with shoot dieback. Isolation was made from the symptomatic plant part. Culture and spore morphology was used to characterize the most common and frequently isolated fungi. Accordingly, it was understood that 3 isolates belong to Alternaria genus, 4 isolates that grouped into genus Phoma, 1 isolate to Pestalotiopsis and 1 isolate to genus Fusarium was found. Among these isolates of Alternaria, isolates Pf-24 and 32 seem to be close to A.alternata and the other one isolate Pf-53 seems to be close to A. arborescens. Two of the isolates in the Phoma, Pf-42 and Pf-22 seems to be related with P. exigua and the other one resemble P.leveillei. The other two isolates Pf-12 and 21 were unidentified. In the inoculation test all the four groups of fungi produced lesion only on wounded leaves. The importance of these fungi in relation with shoot dieback, however, needs further detailed investigation. As far as our knowledge is concerned this is the first report of shoot dieback on P.falcatus in the natural forest of Ethiopia. The impact of these diseases on P.falcatus should get due attention in the management of P.falcatus forest in Ethiopia.
Description: A THESIS SUBMITTED TO THE SCHOOL OF GRADUATE STUDIES OF ADDIS ABABA UNIVERSITY IN PARTIAL FULFILLMENT OF THE REQUIREMENTS FOR THE DEGREE OF MASTER OF SCIENCE IN APPLIED MICROBIOLOGY
URI: http://hdl.handle.net/123456789/22
Appears in:Thesis - Biology

Files in This Item:

File Description SizeFormat
ABRAHAM YIRGU.pdf5.84 MBAdobe PDFView/Open

Items in the AAUL Digital Library are protected by copyright, with all rights reserved, unless otherwise indicated.

 

  Last updated: May 2010. Copyright © Addis Ababa University Libraries - Feedback