Description and identification of two new diseases of guariroba palm (Syagrus oleraceae) in Brazil

Description and identification of two new diseases of guariroba palm (Syagrus oleraceae) in Brazil

Guariroba is a palm species native to central Brazil. Seedlings of guariroba with leaf spots of unknown aetiology were found in Patos de Minas, Minas Gerais, Brazil. The leaf spots were manifest as two different symptom types: the first lesion type consisted of necrotic spots with a rounded to elong...

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Bibliographic Details
Published in:Journal of phytopathology Vol. 165; no. 9; pp. 610 - 619
Main Authors: Cardoso, Jéssica K. B., Nanami, Danielle S. Y., Zanutto, Carlos A., Grabicoski, Edilaine M. G., Vida, João B., Bock, Clive H., Nunes, William M. C.
Format: Journal Article
Language:English
Published: Berlin Wiley Subscription Services, Inc 01-09-2017
Subjects:
Alternaria tenuissima
Color
Diseases
Elongation
Fungi
Fungicides
guariroba
Koch's postulates
Leaves
Lesions
Pestalotiopsis adusta
Physical characteristics
Seedlings
Spots
Syagrus oleracea
Brazil
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Summary:Guariroba is a palm species native to central Brazil. Seedlings of guariroba with leaf spots of unknown aetiology were found in Patos de Minas, Minas Gerais, Brazil. The leaf spots were manifest as two different symptom types: the first lesion type consisted of necrotic spots with a rounded to elongate shape, with a light colour and dark edges; the second lesion type had a rounded shape, was dark brown in colour with a light brown edge. The objective of this study was to elucidate the aetiology of both diseases. The likely causal agents were isolated and Koch's postulate fulfilled. Subsequently, the ITS region of rDNA from both micro‐organisms were amplified and sequenced. According to the morphological characteristics and molecular analyses, the fungal species were identified as Pestalotiopsis adusta (causing necrotic spots with a rounded to elongate shape, with a light colour and dark edges), and Alternaria tenuissima (causing lesions with a rounded shape, dark brown in colour with a light brown edge). Identification of the causal organisms of these two diseases will help guide management approaches that might be tested to reduce impact of the disease on Guariroba, including the use of fungicides and cultural approaches.
ISSN:0931-1785
1439-0434
DOI:10.1111/jph.12599