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

Diversity of insects in conventional and organic tomato crops (Solanum lycopersicum L., solanaceae)

Rubens Pessoa de Barros
  • Rubens Pessoa de Barros
  • Department of Biological Sciences, State University of Alagoas, Brazil.
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Ligia Sampaio Reis
  • Ligia Sampaio Reis
  • Center for Agricultural Sciences, Federal University of Alagoas, Brazil.
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Isabelle Cristina Santos Magalhaes
  • Isabelle Cristina Santos Magalhaes
  • Department of Biological Sciences, State University of Alagoas, Brazil.
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Miriany de Oliveira Pereira
  • Miriany de Oliveira Pereira
  • Department of Biological Sciences, State University of Alagoas, Brazil.
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Ana Cleia Barbosa de Lira
  • Ana Cleia Barbosa de Lira
  • Department of Biological Sciences, State University of Alagoas, Brazil.
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Claudio Galdino da Silva
  • Claudio Galdino da Silva
  • Department of Biological Sciences, State University of Alagoas, Brazil.
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Jaciara Maria Pereira e Silva
  • Jaciara Maria Pereira e Silva
  • Department of Biological Sciences, State University of Alagoas, Brazil.
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João Gomes da Costa
  • João Gomes da Costa
  • Rio Largo Research Unit Technical-Scientific Area, EMBRAPA - Rio Largo-AL, Brazil.
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Elio Cesar Guzzo
  • Elio Cesar Guzzo
  • Rio Largo Research Unit Technical-Scientific Area, EMBRAPA - Rio Largo-AL, Brazil.
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  •  Received: 20 January 2018
  •  Accepted: 07 February 2018
  •  Published: 08 March 2018

Abstract

This study aims to compare the diversity and relative abundance of insect families collected in organic and conventional tomato production systems located in Alagoas, Northeast Brazil (09°81'76"S and 36°59'42"W). In this region, the visible spectrum is quite broad with sunlight throughout the year. Between rows of tomato plants, we set up a system of colored traps colored blue, yellow, white, green, red, and transparent. The experiment was between September 2015 and January 2017. The experimental design was completely randomized with six experiments and with five replicates. The data collected were analyzed using the Scott-Knott test at 5% probability. Analysis of the various diversity indices was made using DivEs software. A total of 56,955 insects from 25 families were collected from the organic system, and 10,660 from 22 families in the conventional system. We observed that, in the conventional system, insect diversity and relative abundance (AR) were significantly greater than those of the organic system. The averages of the indices were as follows: For the organic system: Shannon-Wiener, 2.97; Simpson, 0.79; Simpson Dominance, 0.19; Margalef, 5.13; and Pielou, 2.27, respectively. For the conventional system, the indices were 3.49; 0.86; 0.12; 6.93; and 2.56; respectively. Several families of insect orders collected in the colored traps showed significant mean values for families of pollinator insects, predators, parasitoids, and pests. This may aid in decision making for the protection of plants and other agroecosystems. The collected insects did not differ significantly in terms of diversity of families. Colored traps may be exploited for pest control and for conservation of insect.
 
Key words: Vegetables, agricultural management, agroecology, plant protection.