Ramularia leaf spot severity and effects on cotton leaf area and yield

Authors

DOI:

https://doi.org/10.5216/pat.v46i4.42781

Keywords:

Gossypium hirsutum L., Ramularia areola, disease progress curve.

Abstract

Cotton monoculture favors the development of diseases such as ramularia leaf spot, which causes early defoliation and boll rotting, thus decreasing yield. This study aimed at evaluating the severity of ramularia leaf spot and its effects on cotton leaf area and yield. The experiment was conducted in a triple (4 x 3 x 2) factorial design, consisting of four cultivars (FM940GLT, FM944GL, TMG42WS and TMG43WS), three thirds of the plant (lower, middle and upper) and two management conditions (with and without fungicide application). To the variable area under the disease progress curve, the lowest values were observed in the upper third of the TMG42WS and TMG43WS cultivars, with the lower and middle thirds presenting the highest severity. The condition managed with fungicide and the upper third showed the lowest values for area under the disease progress curve. The leaf area was negatively affected by the ramularia leaf spot. Concerning the seed and fiber yields, the highest averages were observed for the middle third and the condition managed with fungicide. There was no statistical difference for cotton yield loss.

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Author Biographies

  • João Paulo Ascari, Mato Grosso State University
    Engenheiro Agrônomo,mestrando em Ambiente e Sistemas de Produção Agrícola, Universidade do Estado de Mato Grosso.
  • Inês Roeder Nogueira Mendes, Mato Grosso State University
    Engenheira Agrônoma,mestranda em Ambiente e Sistemas de Produção Agrícola, Universidade do Estado de Mato Grosso.
  • Vanessa Costa da Silva, Mato Grosso State University
    Graduanda em agronomia pela Universidade do Estado de Mato Grosso.
  • Dejânia Vieira de Araújo, Mato Grosso State University
    Professora D. Sc. em Fitopatologia do curso de agronomia da Universidade do Estado de Mato Grosso.

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Published

2017-01-10

Issue

v. 46, n. 4, Oct./Dec. 2016

Section

Research Article

License

Authors will not be paid for published articles and must waive their copyright in favor of the PAT journal. On the other hand, they are solely responsible for the content of those articles, even if the Editor holds the right to adjust them to the norms of the journal. Authors are allowed to publish their articles simultaneously in their institutional repositories, as soon as the original publication at the PAT journal is mentioned.

How to Cite

ASCARI, J. P. et al. Ramularia leaf spot severity and effects on cotton leaf area and yield. Pesquisa Agropecuária Tropical [Agricultural Research in the Tropics], v. 46, n. 4, p. 434–441, 10 Jan.2017.