African Journal of
Agricultural Research

  • Abbreviation: Afr. J. Agric. Res.
  • Language: English
  • ISSN: 1991-637X
  • DOI: 10.5897/AJAR
  • Start Year: 2006
  • Published Articles: 6576

Full Length Research Paper

Interaction between potassium (K) and calcium (Ca) on the severity of Yellow Sigatoka in banana plants

Aurivan Soares de Freitas
  • Aurivan Soares de Freitas
  • Department of Plant Pathology, Federal University of Lavras, Lavras, Minas Gerais 37200-000, Brazil
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Edson Ampélio Pozza
  • Edson Ampélio Pozza
  • Department of Plant Pathology, Federal University of Lavras, Lavras, Minas Gerais 37200-000, Brazil
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Adélia Aziz A. Pozza
  • Adélia Aziz A. Pozza
  • Department of Soil Science, Federal University of Lavras, Lavras, Minas Gerais 37200-000, Brazil
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Maria Gilmara de O. Soares
  • Maria Gilmara de O. Soares
  • Department of Plant Pathology, Federal University of Lavras, Lavras, Minas Gerais 37200-000, Brazil
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Humberson Rocha Silva
  • Humberson Rocha Silva
  • Department of Plant Pathology, Federal University of Lavras, Lavras, Minas Gerais 37200-000, Brazil
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Cristian D. Plaza Pérez
  • Cristian D. Plaza Pérez
  • Department of Plant Pathology, Federal University of Lavras, Lavras, Minas Gerais 37200-000, Brazil
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  •  Received: 02 March 2017
  •  Accepted: 05 April 2017
  •  Published: 20 April 2017

Abstract

The main control measure of Yellow Sigatoka (Pseudocercospora musae) in banana plants (Musa spp.) has been the planting of resistant varieties, and fungicide application. However, the use of adequately nourished plants is also emphasized as a complementary control method. This study evaluated the influence of interaction between potassium (K) and calcium (Ca) in nutrient solution on the severity of Yellow Sigatoka in banana. Evaluation included severity of disease, chlorophyll a and b contents, nutrient contents, and total dry weight (TDW). There was no interaction between concentrations of K and Ca for area under the disease severity progress curve (AUDSPC), although the AUDSPC increased in leaves 1 and 2 with increasing concentrations of K from 1 to 6 mmol L-1. Increasing K led to a reduction in chlorophyll a and b contents, and in nutrients N, P, Mg, B, Cu, Zn, and Mn. TDW increased with increasing K. Therefore, high concentration of K causes nutritional imbalance in banana plants, and favors the severity of Yellow Sigatoka.

 

Key words: Hydroponics, Musa spp., nutritional imbalance, Pseudocercospora musae.