Damages caused by Bipolaris maydis in Panicum maximum cv. Tanzânia

Authors

  • Alexandra da Silva Martinez Universidade Estadual do Oeste do Paraná
  • Gilmar Franzener Universidade Estadual do Oeste do Paraná
  • José Renato Stangarlin Universidade Estadual do Oeste do Paraná

DOI:

https://doi.org/10.5433/1679-0359.2010v31n4p863

Keywords:

Leaf spot, Helminthosporium disease, Damage equation

Abstract

The aim of this research was to evaluate the damage caused by Bipolaris maydis in the quantity and quality of the Tanzania grass production. Tanzania grass plants were cultivated in pots of PVC tubes (50 cm of height x 15 cm of diameter) containing a mixture of soil and sand (3:1). The plants were inoculated with spore pathogen suspension containing 102, 104 and 106 conidia/mL to obtain different levels of disease. Severity and number of tillers were evaluated weekly. After four weeks, it were evaluated the weight of the fresh matter of leaves (FM), percentage of dry matter (DM), crude protein (CP), neutral detergent fiber (NDF) and acid detergent fiber (ADF). The disease reduced significantly the plant tillering and FM after the second evaluation (P < 0.05). There was no significant correlation among the variables DM, ADF, and the area under disease progress curve (AUDPC). However, there were positive (P < 0.01) and negative (P < 0.05) correlations among CP and NDF, respectively, with AUDPC, as possible result of the activity of the pathogen. These results showed that B. maydis inhibits the development of the Tanzania grass and promotes alteration in the quality of the forage.

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Author Biographies

Alexandra da Silva Martinez, Universidade Estadual do Oeste do Paraná

Zootecnista, Mestre - UNIOESTE, Campus de Mal. Cândido Rondon/PR.

Gilmar Franzener, Universidade Estadual do Oeste do Paraná

Engenheiro Agrônomo, Mestre - UNIOESTE, Campus de Mal. Cândido Rondon/PR.

José Renato Stangarlin, Universidade Estadual do Oeste do Paraná

Engenheiro Agrônomo, Doutor, Professor Associado, Bolsista do CNPQ II - Universidade Estadual do Oeste do Paraná/UNIOESTE – Cx. P. 91 – 85960-000 - Marechal Cândido Rondon,PR.

Published

2010-12-20

How to Cite

Martinez, A. da S., Franzener, G., & Stangarlin, J. R. (2010). Damages caused by Bipolaris maydis in Panicum maximum cv. Tanzânia. Semina: Ciências Agrárias, 31(4), 863–870. https://doi.org/10.5433/1679-0359.2010v31n4p863

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