Table of Contents
ISRN Entomology
Volume 2014 (2014), Article ID 175827, 5 pages
http://dx.doi.org/10.1155/2014/175827
Research Article

Composition, Repellent, and Insecticidal Activities of Two South American Plants against the Stored Grain Pests Tribolium castaneum and Tribolium confusum (Coleoptera: Tenebrionidae)

1Laboratorio de Zoología de Invertebrados II, Departamento de Biología, Bioquímica y Farmacia, San Juan 670, Universidad Nacional del Sur, B8000CPB Bahía Blanca, Argentina
2Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET), Avenida Rivadavia 1917, C1033AAJ Ciudad Autónoma de Buenos Aires, Argentina
3Instituto de Química del Sur (INQUISUR), Avenida Alem 1253, Universidad Nacional del Sur, B8000CPB Bahía Blanca, Argentina

Received 8 November 2013; Accepted 24 December 2013; Published 20 February 2014

Academic Editors: C. Abramson and M. V. Micieli

Copyright © 2014 Verónica Benzi et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

As part of a screening program to evaluate the biological activity of indigenous plants, we report the composition and the bioactivity of essential oils (EOs) extracted from Té de Burro Aloysia polystachya [(Griseb.) Moldenke] and Lemon Verbena Aloysia citriodora [Palau] against two of the most widespread secondary pests of stored products, the red flour beetle Tribolium castaneum [Herbst] and the confused flour beetle Tribolium confusum [Jacqueline du Val]. Analysis by gas chromatography-mass spectrometry of the EOs led the identification of their major constituents and their relative proportions. EO of A. citriodora showed the highest repellent activity against both beetles (>70%). On the other hand, both plants showed fumigant toxicity only against T. confusum, without significant differences between them (LC50 values of 5.92 and 5.53 mg/L air for A. polystachya and A. citriodora, resp.). For contact toxicity (topical applications) the EO of A. polystachya was more effective (LD50 = 7.35 μg/insect) than the EO of A. citriodora (LD50 = 13.8 μg/insect) only against T. castaneum. On the other hand, T. confusum was not susceptible by contact to any of these EOs. These results provide important tools for the development of an Integrated Pest Management (IPM) program.