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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 (&gt;70%). On the other hand, both plants showed fumigant toxicity only against  T. confusum , without significant differences between them (LC 50  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 (LD 50  = 7.35  μ g/insect) than the EO of  A. citriodora  (LD 50  = 13.8  μ g/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.

isrn entomology

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

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