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Chilean Journal of Agricultural Research
Instituto de Investigaciones Agropecuarias, INIA
ISSN: 0718-5820
EISSN: 0718-5839
Vol. 72, No. 3, 2012, pp. 345-349
Bioline Code: cj12054
Full paper language: English
Document type: Research Article
Document available free of charge

Chilean Journal of Agricultural Research, Vol. 72, No. 3, 2012, pp. 345-349

 en TOXICITY OF BOLDO Peumus boldus check for this species in other resources MOLINA FOR Sitophilus zeamais check for this species in other resources MOTSCHULSKY AND Tribolium castaneum check for this species in other resources HERBST
Ortíz U., Margarita; Silva A., Gonzalo; Tapia V., Maritza; Rodríguez M., J. Concepción; Lagunes T., Angel; Santillán-Ortega, Candelario; Robles-Bermúdez, Agustín & Aguilar-Medel, Sotero

Abstract

The maize weevil ( Sitophilus zeamais check for this species in other resources Motschulsky) and the red flour beetle ( Tribolium castaneum check for this species in other resources Herbst) are two key pests of stored-grain products worldwide. The insecticidal activity of boldo ( Peumus boldus check for this species in other resources Molina) powder, liquid ethanolic and hexanic extracts against S. zeamais and T. castaneum were evaluated under laboratory conditions. The evaluated variables were mortality, emergence of adult insects (F1), and grain weight loss. The experimental design was completely randomized. The mortality in S. zeamais was 100% even at the lowest powder concentration (0.5% w/w), whereas emergence of F1 adult insects was 0% and grain weight loss was = 0.08%. For T. castaneum, only 8 and 16% w/w powder concentrations reached 100% mortality. The liquid ethanolic and hexanic extracts caused 100% mortality of S. zeamais, whereas only the ethanolic extract reached this value for T. castaneum. Therefore, the powder and the evaluated extracts of P. boldus were toxic for S. zeamais and T. castaneum and are promising against these and other stored-grain pests.

Keywords
Botanical insecticides, stored grains, maize weevil, red flour beetle

 
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