Composition, repellent and insecticidal activities of two south american plants against the stored grain pests Tribolium castaneum and Tribolium confusum (Coleoptera: Tenebrionidae)

BENZI, V.; STEFANAZZI, N; MURRAY, A.P.; WERDIN GONZÁLEZ, J.O.; FERRERO, A. A.

ISRN Entomology

Hindawi Publishing Corporation

Año: 2014 p. 1 - 5

2314-5447

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, respectively). 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.