The insecticidal, molting disruption and insect growth inhibitory activity

CARLOS L. CÉSPEDES; SOFIA C. MOLINA; EVELYN MUÑOZ; CLAUDIO LAMILLA; JULIO ALARCON; SARA M. PALACIOS; MARÍA C. CARPINELLA; JOSE G. AVILA

Industrial Crops and Products

ELSEVIER SCIENCE BV

Lugar: Amsterdam; Año: 2013 vol. 42 p. 78 - 86

0926-6690

Si bien este trabajo tiene sus datos completos de publicación en el año 2013, fue aceptado y se encuentra en la web de Elsevier en el presente año 2012. Extracts obtained from a common shrub that occurs as part of vegetative species growing on arid lands of North-Central Chile and adjacent central Argentina, known as piquilin, Condalia microphylla (Rhamnaceae) showed insect growth inhibitory activity against the fall armyworm Spodoptera frugiperda, yellow meal worm Tenebrio molitor and fruit fly Drosophila melanogaster larvae in artificial diet feeding assays. The effects of these extracts on mortality, antifeedancy and growth inhibition were examined. The phytochemical profile of the most active extract was examined with conventional chromatographic and spectroscopic procedures. This n-hexane extract showed a high percentage of hentriacontane and triacontane. The observed mortality strongly correlates with the contents of these long-chain n-alkanes compounds, the LD50 for n-hexane, ethyl acetate and methanol extracts against S. frugiperda, were 3.89, 9.4, and 9.7 ppm; against T. molitor 5.2, 14.2, and 20.4 ppm, and against D. melanogaster 3.23, 7.65 and 17.9 ppm, respectively.