Fungi Associated With Shboot Dieback Of Podocarpus Falcatus

Plant Biology And Biodiversity Management Project Topics

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In Ethiopia, information available on tree disease is limited and scanty. In the field surveyrnconducted in Menagesha-Suba and Munesa-shashemene natural forests the shoot diebackrnwas observed on Podocarplls falcalus. Symptoms were initially observed on leaves andrntwo-three small circular brown spots were found at the vety tip of the leading shoot.rnGradually the color of the leaves changes into yellow, and to light brown as the shootsrndie. This symptom of dieback was observed both on seedlings, sapling and mature trees.rnA study was conducted to understand which fungi was associated with shoot dieback.rnIsolation was made ii-om the symptomatic plant part. Culture and spore morphology wasrnused to characterize the most common and frequently isolated fungi. Accordingly, it wasrnunderstood that 3 isolates belong to Alternaria genus, 4 isolates that grouped into genusrnPhoma, 1 isolate to Pestalotiopsis and I isolate to genus Fusarium was found. Amongrnthese isolates of Alternaria, isolates Pf-24 and 32 seem to be close to A.alternala and thernother one isolate Pf-53 seems to be close to A. arborescens. Two of the isolates in thernPhoma, Pf-42 and Pf-22 seems to be related with P. exigI/a and the other one resemblernP.leveillei. The other two isolates Pf-12 and 21 were unidentified. In the inoculation testrnall the four groups of fungi produced lesion only on wounded leaves. The importance ofrnthese fungi in relation with shoot dieback, however, needs further detailed investigation.rnAs far as our knowledge is concerned this is the first report of shoot dieback onrnP falcatlls in the natural forest of Ethiopia. The impact of these diseases on Pfalcalusrnshould get due attention in the management of P.filicallis forest in Ethiopia.rnrnKEY WORDS: Podocarplls filicatus, Alternaria species, Phoma species, Pestaloliopsisrnspecies, Fusarium species, Shoot dieback

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Fungi Associated With Shboot Dieback Of Podocarpus  Falcatus

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