Bipolaris yamadae as a causal agent of brown leaf spot in Megathyrsus maximus in Brazil

被引：0

作者：

Sanches, Marcio Martinello ^{[1
]}

Fernandes, Celso Dornelas ^{[1
]}

Batista, Margareth Vieira ^{[1
]}

Verzignassi, Jaqueline Rosemeire ^{[1
]}

Theodoro, Gustavo de Faria ^{[2
]}

Gutoski, Diego Vaz ^{[3
]}

机构：

[1] Empresa Brasileira Pesquisa Agr Embrapa Gado Corte, Campo Grande, MS, Brazil

[2] Univ Fed Mato Grosso do Sul, Fac Med Vet & Zootecnia, Campo Grande, MS, Brazil

[3] Univ Anhanguera, Campo Grande, MS, Brazil

来源：

PESQUISA AGROPECUARIA TROPICAL | 2024年 / 54卷

关键词：

Panicum maximum; forage diseases; molecular phylogeny;

D O I：

10.1590/1983-40632024v5477542

中图分类号：

S [农业科学];

学科分类号：

09 ;

摘要：

Guinea grass (Megathyrsus maximus) is widely used as a forage crop in Brazil, but its production faces disease threats. Recently, new symptoms, such as oblong to irregular brown lesions on leaves, have emerged in M. maximus across the country. Particularly severe symptoms were observed in the BRS Tamani cultivar, and some other genotypes showed lesion coalescence and intense leaf necrosis. This study aimed to identify the cause of these symptoms. A fungus was isolated from the lesions and, using morphological measurements and molecular analysis of the ITS, GPDH and TEF-1 alpha genes, it was identified as Bipolaris yamadae. Pathogenicity tests confirmed its ability to cause disease in M. maximus cv. Tamani. A field survey of 205 M. maximus genotypes showed severe symptoms in 8.35 % of the materials.

引用

页数：5

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