Etiology of Phaeosphaeria leaf spot of maize in Brazil

Phaeosphaeria leaf spot (PLS), which has been attributed to Phaeosphaeria maydis, is a major maize disease in Brazil. However, there are doubts about its causal agent. Aiming to identify and to characterize fungi related to PLS in Brazil, maize leaves with typical lesions were collected in Goias (GO...

Full description

Saved in:
Bibliographic Details
Published in:Phytopathology 2004-06, Vol.94 (6)
Main Authors: Dal Soglio, FK, do Amaral, AL, De Carli, ML, Neto, JFB
Format: Article
Language:English
Subjects:
Phoma sorghina
Phyllosticta
Sporormiella
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:Phaeosphaeria leaf spot (PLS), which has been attributed to Phaeosphaeria maydis, is a major maize disease in Brazil. However, there are doubts about its causal agent. Aiming to identify and to characterize fungi related to PLS in Brazil, maize leaves with typical lesions were collected in Goias (GO) and Rio Grande do Sul (RS) States, in two growing seasons, early and late season, in 2002 and 2003. Segments of leaves with lesions were disinfested and placed in moist chambers. Fungi were isolated in PDA and sent to CABI - Bioscience, UK, for identification. Pathogenicity tests were carried out in different environments (acclimatized room, plastic greenhouse and in field conditions). Phyllosticta sp. (anamorph of P. maydis), Phoma sorghina and Sporormiella sp. were isolated and proved pathogenic to maize. Whether Phoma sorhina occurred in all environments, Sporormiella sp. And Phyllosticta sp. Were restricted, respectively, to GO and to RS. According to these results, different fungi species, especially P. sorghina, are associated to PLS symptoms in Brazil, and environmental conditions play an important role in the predominance of a specific agent at different locations.
ISSN:0031-949X