Resumo

ARANGO GUTIERREZ, Gloria Patricia  e  VASQUEZ VILLEGAS, María Clara. Toxic effect of Verbena officinalis (Verbenaceae family) in Sitophilus granarius (coleoptera: curculionidae). Rev. Lasallista Investig. [online]. 2008, vol.5, n.2, pp.74-82. ISSN 1794-4449.

Introduction. Sitophilus granarius, or maize beetle, is considered as one of the most important plagues of stored products. Objective. To evaluate the effect of Verbena officinalis in the Sitophilus granarius control in stored corn. Materials and methods. Two presentations of verbena Verbena officinalis were avaluated in the laboratory for the control of Sithophilus granarius in stored corn, with concentrations in powder of 0,4 g, 0,8 g, and 1,6 g per every 10 g of corn and manure of 3, 6 and 9 ml per every 10 g of variable maize was the mortality rate of the imagos. The experimental design was done at random, the treatments had four repetitions. Results. The highest mortality rate was obtained in powder in concentration of 1,6 gr with a mortality rate of 50%. In the variance analysis made, the kinds of presentation were meaningless and the concentrations used in the Verbena extract were too low to generate a higher mortality in Sitophilus. Conclusion. Secondary metabolites have a toxic activity against insects, interfering in their development or their behavior, and thus contributing to plague control.

Palavras-chave : Verbenaceae; Verbena Officinalis L; Sitophilus granarius L; Bioinsecticide; Aromatic plants; Beetles.

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