Efficacy of the methyl parathion and the aqueous extract of dry neem leaves in the control of Anacanthorus penilabiatus (Monogenoidea) in pacu (Piaractus mesopotamicus)

Authors

  • Claudinei da Cruz Laboratório de Ecotoxicologia dos Agrotóxicos e Saúde Ocupacional, do Departamento de Fitossanidade da UNESP - Campus de Jaboticabal e Centro de Aq-­¼icultura da UNESP/CAUNESP, Campus de Jaboticabal http://orcid.org/0000-0003-4064-0718
  • Joaquim Gonçalves Machado Neto Laboratório de Ecotoxicologia dos Agrotóxicos e Saúde Ocupacional, do Departamento de Fitossanidade da UNESP - Campus de Jaboticabal e Centro de Aq-­¼icultura da UNESP/CAUNESP, Campus de Jaboticabal
  • Rodrigo Yudi Fujimoto Universidade Federal do Pará, UFPA, Campus de Bragança-PA
  • Matheus Nicolino Peixoto Henares Laboratório de Ecotoxicologia dos Agrotóxicos e Saúde Ocupacional, do Departamento de Fitossanidade da UNESP - Campus de Jaboticabal e Centro de Aq-­¼icultura da UNESP/CAUNESP, Campus de Jaboticabal
  • Daniela Avilez Duó Laboratório de Ecotoxicologia dos Agrotóxicos e Saúde Ocupacional, do Departamento de Fitossanidade da UNESP - Campus de Jaboticabal e Centro de Aq-­¼icultura da UNESP/CAUNESP, Campus de Jaboticabal

Keywords:

Piaractus mesopotamicus, treatment, efficacy, parasites, methyl parathion, neem

Abstract

This work determined the efficacy of the insecticide methyl parathion and the natural pesticide azadirachtin present in the aqueous extract of dry neem leaves (AEDNL) to Anacanthorus penilabiatus (Monogenoidea) control in pacu (Piaractus mesopotamicus). The efficacy of methyl parathion was evaluated in an experiment consisting of six treatments (0.0, 3.0, 4.0, 5.0, 6.0 and 7.0 mg methyl parathion/L water) and five exposure times (2, 4, 8, 16 and 24 hr). The efficacy of azadirachtin present in AEDNL was assessed in an experiment consisting of seven treatments (0.0; 25; 50; 75; 100; 125; and 150 mL/L water) and five exposure times (24, 48, 72, 96 and 120 hr). The efficacy of methyl parathion increased with increasing concentration and exposure time. The highest control efficacy was obtained with a concentration of 7 mg methyl parathion/L at all exposure times. In this treatment, the highest efficacies were observed at 16 and 24 hr of exposure, with a control rate of 96.2 and 97.0%, respectively. For the AEDNL, the highest control efficacy (89.2%) was obtained with a concentration of 2.9 mg/L after 120 hr of exposure. The efficacy in the treatments employing 1.47 and 1.18 mg/L was 83.9 and 82.5%, respectively, after 120 hr of exposure. Methyl parathion presented a higher efficacy in the control of A. penilabiatus than the AEDNL. The AEDNL was moderately effective in the control of the parasite.

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Published

2018-10-31

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