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

Authors

  • João Paulo Ascari Universidade do Estado de Mato Grosso
  • Inês Roeder Nogueira Mendes Universidade do Estado de Mato Grosso
  • Vanessa Costa da Silva Universidade do Estado de Mato Grosso
  • Dejânia Vieira de Araújo Universidade do Estado de Mato Grosso

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, Universidade do Estado de Mato Grosso

Engenheiro Agrônomo,mestrando em Ambiente e Sistemas de Produção Agrícola, Universidade do Estado de Mato Grosso.

Inês Roeder Nogueira Mendes, Universidade do Estado de Mato Grosso

Engenheira Agrônoma,mestranda em Ambiente e Sistemas de Produção Agrícola, Universidade do Estado de Mato Grosso.

Vanessa Costa da Silva, Universidade do Estado de Mato Grosso

Graduanda em agronomia pela Universidade do Estado de Mato Grosso.

Dejânia Vieira de Araújo, Universidade do Estado de Mato Grosso

Professora D. Sc. em Fitopatologia do curso de agronomia da Universidade do Estado de Mato Grosso.

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Published

2017-01-10

How to Cite

ASCARI, J. P.; MENDES, I. R. N.; SILVA, V. C. da; ARAÚJO, D. V. de. Ramularia leaf spot severity and effects on cotton leaf area and yield. Pesquisa Agropecuária Tropical [Agricultural Research in the Tropics], Goiânia, v. 46, n. 4, p. 434–441, 2017. Disponível em: https://revistas.ufg.br/pat/article/view/42781. Acesso em: 21 may. 2024.

Issue

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

Section

Research Article

License

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