13
views
0
recommends
+1 Recommend
1 collections
    0
    shares
      • Record: found
      • Abstract: found
      • Article: found
      Is Open Access

      Efecto de diferentes surfactantes sobre larvas III de Spodoptera frugiperda Smith bajo condiciones de laboratorio y de campo Translated title: Effect of different surfactants on larvae III of Spodoptera frugiperda Smith under laboratory and field conditions

      Read this article at

      Bookmark
          There is no author summary for this article yet. Authors can add summaries to their articles on ScienceOpen to make them more accessible to a non-specialist audience.

          Abstract

          Zea mays L. es un cultivo de importancia económica a nivel mundial; sin embargo, se ve afectado por diversas plagas, siendo Spodoptera frugiperda Smith su plaga clave. Su larva es denominada "cogollero" pues ataca el cogollo joven poniendo en riesgo el desarrollo del vegetal. El uso desmedido de los insecticidas para su control no ha podido evitar la resistencia desarrollada por este insecto y se disocia con el cuidado del medio ambiente, motivo por el cual se enfrentaron larvas III de S. frugiperda a diferentes concentraciones de surfactantes como dimetilsulfóxido (DMSO) y Tween 80, empleados habitualmente en diferentes industrias por sus propiedades tensoactivas, adherentes, detergentes y de baja residualidad. Se desarrolló un diseño experimental en bloques completamente al azar, en laboratorio y en campo. Las concentraciones empleadas en laboratorio fueron tres de DMSO (0,3 %; 0,4 %; 0,6 %) y tres de Tween 80 (0,1 %; 0,2 %; 0,3 %), además de un control (0 %). El T4 (0,6 % DMSO) promovió una mortalidad larval de 83,33 % y el T7 (0,3 % Tween 80) alcanzó el 90 %. En condiciones de campo, se empleó además un testigo (metamidofós 600 g/L). Tanto el producto comercial como la concentración de 0,6 % de DMSO alcanzaron una mortalidad larval promedio de 76 %. Se concluyó que, a mayor concentración de surfactante, la mortalidad larval aumenta. Así mismo, a mayor tiempo de exposición mortalidad larval tiende a subir.

          Translated abstract

          Zea mays L. is a global economically important crop; nevertheless, it is affected by various plagues, with Spodoptera frugiperda Smith as its key plague. This insect larva is called "cogollero" since it attacks the young sprouts putting in risk the development of the maize. The disproportionate use of insecticides for its control is not able to eliminate the resistance developed by this insect and disagree with the care of the environment, which was the reason to expose larvae III of S. frugiperda to different surfactant concentrations as dimethyl sulfoxide (DMSO) and Tween 80, habitually employed in different industries for their tensoactive, adherent, detergent and low residual properties. We developed an experimental design with random blocks, in laboratory and field. The concentrations employed in laboratory were three of DMSO (0,3 %; 0.4 %; 0.6 %) and three of Tween 80 (0,1 %; 0,2 %; 0,3 %), besides a control (0 %). T4 (0,6 % DMSO) promoted a larva mortality of 83,33 %, and T7 (Tween 80 0,3 %) reached 90 %. On field conditions, a different control treatment was used (600 g/L of methamidophos). The commercial version and the 0,6 % of DMSO reached a larva mortality media of 76 %. In conclusion, the higher the surfactant concentration, the higher the larva mortality is. Likewise, the longer the time of exposure, the larva mortality is more likely to increase.

          Related collections

          Most cited references 35

          • Record: found
          • Abstract: found
          • Article: not found

          Evidence of multiple/cross resistance to Bt and organophosphate insecticides in Puerto Rico population of the fall armyworm, Spodoptera frugiperda.

          Fall armyworm (FAW) is a damaging pest of many economic crops. Long-term use of chemical control prompted resistance development to many insecticide classes. Many populations were found to be significantly less susceptible to major Bt toxins expressed in transgenic crops. In this study, a FAW strain collected from Puerto Rico (PR) with 7717-fold Cry1F-resistance was examined to determine if it had also developed multiple/cross resistance to non-Bt insecticides. Dose response assays showed that the PR strain developed 19-fold resistance to acephate. Besides having a slightly smaller larval body weight and length, PR also evolved a deep (2.8%) molecular divergence in mitochondrial oxidase subunit II. Further examination of enzyme activities in the midgut of PR larvae exhibited substantial decreases of alkaline phosphatase (ALP), aminopeptidase (APN), 1-NA- and 2-NA-specific esterase, trypsin, and chymotrypsin activities, and significant increases of PNPA-specific esterase and glutathione S-transferase (GST) activities. When enzyme preparations from the whole larval body were examined, all three esterase, GST, trypsin, and chymotrypsin activities were significantly elevated in the PR strain, while ALP and APN activities were not significantly different from those of susceptible strain. Data indicated that multiple/cross resistances may have developed in the PR strain to both Bt toxins and conventional insecticides. Consistently reduced ALP provided evidence to support an ALP-mediated Bt resistance mechanism. Esterases and GSTs may be associated with acephate resistance through elevated metabolic detoxification. Further studies are needed to clarify whether and how esterases, GSTs, and other enzymes (such as P450s) are involved in cross resistance development to Bt and other insecticide classes.
            Bookmark
            • Record: found
            • Abstract: found
            • Article: not found

            Safe use of metal-contaminated agricultural land by cultivation of energy maize (Zea mays).

            Production of food crops on trace element-contaminated agricultural lands in the Campine region (Belgium) can be problematic as legal threshold values for safe use of these crops can be exceeded. Conventional sanitation of vast areas is too expensive and alternatives need to be investigated. Zea mays on a trace element-contaminated soil in the region showed an average yield of 53 ± 10 Mg fresh or 20 ± 3 Mg dry biomass ha(-1). Whole plant Cd concentrations complied with legal threshold values for animal feed. Moreover, threshold values for use in anaerobic digestion were met. Biogas production potential did not differ between maize grown on contaminated and non-contaminated soils. Results suggested favorable perspectives for farmers to generate non-food crops profitably, although effective soil cleaning would be very slow. This demonstrates that a valuable and sustainable alternative use can be generated for moderately contaminated soils on which conventional agriculture is impaired.
              Bookmark
              • Record: found
              • Abstract: not found
              • Article: not found

              Genetic basis of Cry1F resistance in two Brazilian populations of fall armyworm, Spodoptera frugiperda

                Bookmark

                Author and article information

                Contributors
                Role: ND
                Role: ND
                Role: ND
                Journal
                arnal
                Arnaldoa
                Arnaldoa
                Universidad Privada Antenor Orrego, Museo de Historia Natural (Trujillo, , Peru )
                1815-8242
                2413-3299
                September 2018
                : 25
                : 3
                : 1041-1052
                Affiliations
                Trujillo orgnameUniversidad Nacional de Trujillo orgdiv1Facultad de Ciencias Biológica PERÚ
                Article
                S2413-32992018000300015
                10.22497/arnaldoa.253.25315

                This work is licensed under a Creative Commons Attribution-NonCommercial 4.0 International License.

                Page count
                Figures: 0, Tables: 0, Equations: 0, References: 46, Pages: 12
                Product
                Product Information: website
                Categories
                Artículos originales

                Comments

                Comment on this article