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Essential oil of Ocotea odorifera: An alternative against Sitophilus zeamais

Published online by Cambridge University Press:  08 March 2013

Altemir J. Mossi*
Affiliation:
Universidade Federal da Fronteira Sul—Campus de Erechim, Av. Dom João Hoffmann, 313, 99700-000, Erechim, RS, Brazil
Camila A. Zanella
Affiliation:
Universidade Regional Integrada do Alto Uruguai e das Missões—Campus de Erechim, Av. Sete de Setembro, 1621, 99700-000, Erechim, RS, Brazil
Gabriela Kubiak
Affiliation:
Universidade Regional Integrada do Alto Uruguai e das Missões—Campus de Erechim, Av. Sete de Setembro, 1621, 99700-000, Erechim, RS, Brazil
Lindomar A. Lerin
Affiliation:
Universidade Regional Integrada do Alto Uruguai e das Missões—Campus de Erechim, Av. Sete de Setembro, 1621, 99700-000, Erechim, RS, Brazil
Rogerio L. Cansian
Affiliation:
Universidade Regional Integrada do Alto Uruguai e das Missões—Campus de Erechim, Av. Sete de Setembro, 1621, 99700-000, Erechim, RS, Brazil
Fernando Scarati Frandoloso
Affiliation:
Universidade Regional Integrada do Alto Uruguai e das Missões—Campus de Erechim, Av. Sete de Setembro, 1621, 99700-000, Erechim, RS, Brazil
Valéria Dal Prá
Affiliation:
Departamento de Engenharia Química/Laboratório de Engenharia de Bioprocessos, Universidade Federal de Santa Maria—UFSM, Avenida Roraima, Bairro Camobi, 97105-900, Santa Maria, RS, Brazil
Marcio Antonio Mazutti
Affiliation:
Departamento de Engenharia Química/Laboratório de Engenharia de Bioprocessos, Universidade Federal de Santa Maria—UFSM, Avenida Roraima, Bairro Camobi, 97105-900, Santa Maria, RS, Brazil
Jorge Alberto Vieira Costa
Affiliation:
Escola de Química e Alimentos/Laboratório de Engenharia Bioquímica, Universidade Federal do Rio Grande—FURG, Rua Alfredo Huch 475, 96201-900, Rio Grande, RS, Brazil
Helen Treichel
Affiliation:
Universidade Federal da Fronteira Sul—Campus de Erechim, Av. Dom João Hoffmann, 313, 99700-000, Erechim, RS, Brazil
*
*Corresponding author: [email protected]

Abstract

Nowadays, the maize weevil Sitophilus zeamais—Motsch 1855 is the most relevant pest found during storage of maize grains. Aiming at protecting the agricultural crops, high amounts of synthetic pesticides are used around the world. In this sense, this work aimed at evaluating the insecticidal and repellent effect of essential oil of Ocotea odorifera (Vellozo) Rohwer (Lauraceae) (O. odorifera (sassafras)) leaves against the maize weevil in maize grains. The essential oil's chemical composition showed that sassafras contains camphor (43%) and safrole (42%) as major compounds. Our results show that sassafras oil was insecticidal and repellent to maize weevil. About 100% mortality was achieved using a concentration of 0.32 μl cm−2, after 24 h of exposure. The LD50 value was 14.1 μl or 0.09 μl cm−2 and the study of the effect on insect mortality at the lethal doses (LD50) showed that after 72 h mortality was 100%. The values of the preference index varied from −0.39 (0.065 μl cm−2) to −0.63 (0.659 μl cm−2), demonstrating that the plant oil presents repellent activity. The repellency bioassay simulating small bins showed the repellent effect level from 0.64 (0.36 μl cm−3) to 0.94 (2.9 μl cm−3). The essential oil of sassafras presented insecticidal and repellency against maize weevil. Although from an economical point of view synthetic chemicals are still more frequently used as repellents, natural products (essential oils) have the potential to provide efficient and safer repellents for humans and the environment.

Type
Research Papers
Copyright
Copyright © Cambridge University Press 2013 

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