Salvia officinalis essential oil in bean weevil control

Maurício Albertoni Scariot,Altemir José Mossi,Lauri Lourenço Radünz,Francisco Wilson Reichert Júnior,Jhonatan Paulo Barro

doi:10.1590/1983-40632016v4640034

Maurício Albertoni Scariot, Altemir José Mossi + Show 3 more

Open Access

https://doi.org/10.1590/1983-40632016v4640034

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Abstract

ABSTRACT Bean weevil [Acanthoscelides obtectus Say (Coleoptera: Bruchidae)] is considered the main storage pest of the bean crop. Its control is performed mainly by chemical treatment, which has potential to cause resistance in pests, as well as environmental contamination. This study aimed at evaluating the insecticidal and repellent effect of Salvia officinalis L. essential oil against bean weevil. The doses used for the insecticidal test were: 0 L t-1, 0.5 L t-1, 1.0 L t-1, 1.5 L t-1, 2.5 L t-1 and 5.0 L t-1 of bean grains. For the mortality test, the experimental design was completely randomized, in a 6 × 7 (dose × time) factorial scheme, with five replications. The number of dead insects was counted at 2, 6, 12, 24, 48, 72 and 96 h after the insect introduction. The repellency test was conducted in arenas, under a completely randomized design, using the same doses applied to evaluate the insecticidal effect. Counts were performed 24 h after the introduction of insects. The insecticidal effect of the S. officinalis essential oil on A. obtectus resulted in mortality rates higher than 95 %, after 6 h of insect introduction, for all doses tested. Repellency effect was also detected for all doses tested.

Highlights

Brazil is one of the world’s major producers of beans (Phaseolus vulgaris L.)
The experiment was conducted at the Universidade Federal da Fronteira Sul, in Erechim, Rio Grande do Sul State, Brazil, in January 2014, in BOD chambers with 25 oC ± 2 oC and relative humidity (RH) of 70 % ± 10 %, with a 12-h photoperiod
The results showed that the S. officinalis essential oil has insecticidal effect on A. obtectus

Summary

Introduction

Brazil is one of the world’s major producers of beans (Phaseolus vulgaris L.). For this reason, the crop has an economic and social importance for many farmers, since it can be grown in different regions of the country (Smiderle et al 2014).Insect pests attack different developmental stages of beans in the field, as well as in storage. Brazil is one of the world’s major producers of beans (Phaseolus vulgaris L.). For this reason, the crop has an economic and social importance for many farmers, since it can be grown in different regions of the country (Smiderle et al 2014). Insect pests attack different developmental stages of beans in the field, as well as in storage. The bean weevil (Acanthoscelides obtectus) is a pest that occurs mainly in temperate regions and has a potential for cross infestation, causing direct losses in grain quantity and quality, and indirect losses as vectors of storage fungi (Gallo et al 2002, Lorini et al 2010)

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