The combined effects of temperature and leaf wetness periods on soybean frogeye leaf spot intensity

Authors

  • Juliane Nicolodi Camera Universidade de Passo Fundo
  • Valéria Cecília Ghissi Universidade de Passo Fundo
  • Erlei Melo Reis OR Melhoramento de Sementes Ltda.
  • Carolina Cardoso Deuner Universidade de Passo Fundo

DOI:

https://doi.org/10.5433/1679-0359.2016v37n1p77

Keywords:

Cercospora sojina, Glycine max L.

Abstract

The frogeye leaf spot, a disease caused by the fungus Cercospora sojina, affects soybean crops worldwide with enormous economic impact. In this study, we evaluated the combined effects of temperature and duration of leaf wetness periods on the intensity of frogeye leaf spot in soybean. Experiments were conducted in a growth chamber with cultivar Don Mario 7.0i at temperatures of 15, 20, 25, 30 and 35°C and leaf wetness periods of 12, 24, 36, 48 and 72 hours. The experimental design was completely randomized with five replications. When soybean plants were grown at 15°C, affected leaflet area, number of lesions per leaflet and diameter of lesions could only be measured after 60 hours of leaf wetness. At the temperatures of 20 and 25°C this period was reduced to 24 hours of leaf wetness, at 30oC, we found the need for 36 hours of leaf wetness and at a temperature of 35°C, 48 hours. The optimal temperatures for disease development were 27°C for diameter and affected leaflet area and 28°C for number of lesions per leaflet with 72 hours of leaf wetness.

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Author Biographies

Juliane Nicolodi Camera, Universidade de Passo Fundo

Discente de Doutorado em Agronomia, PPAgro, Universidade de Passo Fundo, UFP, RS, Brasil.

Valéria Cecília Ghissi, Universidade de Passo Fundo

Discente de Doutorado em Agronomia, PPAgro, Universidade de Passo Fundo, UFP, RS, Brasil.

Erlei Melo Reis, OR Melhoramento de Sementes Ltda.

Pesquisador, OR Seeds, Passo Fundo, RS, Brasil.

Carolina Cardoso Deuner, Universidade de Passo Fundo

Profª de Graduação e Pós-Graduação em Agronomia, UFP, RS, Brasil.

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Published

2016-02-29

How to Cite

Camera, J. N., Ghissi, V. C., Reis, E. M., & Deuner, C. C. (2016). The combined effects of temperature and leaf wetness periods on soybean frogeye leaf spot intensity. Semina: Ciências Agrárias, 37(1), 77–84. https://doi.org/10.5433/1679-0359.2016v37n1p77

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