Abstract

RODRIGUEZ, Silvia et al. Activity of nonpolar extracts from Picrasma Crenata (Simaroubaceae) against Myzus Persicae (Hemiptera: Aphididadae). Rev. latinoam. quím [online]. 2011, vol.39, n.3, pp.113-120. ISSN 0370-5943.

The insecticidal activity of nonpolar extracts from Picrasma crenata (Veil.) Engl. was tested on Myzus persicae (Sulzer). Two trials were conducted, in both of them, the experimental unit was a leaf of strawberry (Fragaria x ananassa). In the first experiment, the extract solvents were petroleum ether (PE), dichloromethane (DC) and ethyl acetate (EA) at 3000 ppm and 6000 ppm (controls: methanol and water). The mortality rate was recorded at 6, 12, 24 and 48 hours. Data was analyzed by ANOVA and Tukey test (p ≤ 0,05). At 48 hours, mortality was 75% for PE in each of the concentrations, 90% and 93% for DC and 100% for both EA concentrations. In the second experiment the dichloromethane extract was evaluated at 6000 ppm and 12000 ppm. Both concentrations produced 100% mortality. The ethyl acetate and dichloromethane extracts showed a significant toxic activity; however, the first demonstrated more effectiveness at lower concentrations.

Keywords : Picrasma crenata; Myzus persicae; Fragaria x ananassa; insecticidal activity.

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