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Investigación Agraria

On-line version ISSN 2305-0683

Abstract

GOMEZ, Felisa Concepción; RAMIREZ, María Bernarda  and  GAONA, Edgar Francisco. Insecticidal effect of Chenopodium ambrosioides L. powder and calcium carbonate in control of Sitophilus zeamais in corn kernels. Investig. Agrar. [online]. 2016, vol.18, n.2, pp.116-120. ISSN 2305-0683.  https://doi.org/10.18004/investig.agrar.2016.diciembre.116-120.

The aim of the investigation was to evaluate the efficacy of Chenopodium ambrosioides plant powders and calcium carbonate at concentrations of 1, 2 and 3% (w/w), respectively in control of Sitophilus zeamais Motschulsky in corn kernels (Zea mays L.). The experiment was conducted in the laboratory of Entomology at Faculty of Agricultural Sciences, National University of Asunción (FCA/UNA), San Lorenzo, Paraguay, under controlled temperature conditions of 28±5ºC and relative humidity of 70±5%. The experimental design was completely randomized with 10 treatments and 10 repetitions with a total of 100 experimental units. Each experimental unit was represented by the concentration of the corresponding powders, with 10 adult insects on 100 g of corn. The variable measured was mortality of S. zeamais evaluated from 24 hours to 55 days after the application of powders. C. ambrosioides powder (Ka'arê) in all concentrations was effective in controlling S. zeamais, from 24 hours after application (81 to 100% mortality). Assessments made with calcium carbonate at 90% in the concentrations 1 and 2%, respectively, showing and efficiency of 93 and 94% of mortality fom 15 days after application. At 55 days calcium carbonate at 100% in all concentrations resulted in an efficacy of 98 and 100% mortality.

Keywords : Chenopodium ambrosioides; maize weevil; alternative control; vegetal powder.

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