Examinando por Materia "Extracts"

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  • Miniatura
    PublicaciónAcceso abierto
    Repellency of adults of whitefly Trialeurodes vaporariorum (Heteroptera: Aleyrodidae) with clove and pipper.
    (Universidad del Valle, 2020-12-26) Aguilar Astudillo, Eduardo; Rodríguez Hernández, Cesáreo; Bravo Mojica, Hiram; Soto Hernández, Ramón Marcos; Bautista Martínez, Néstor; Guevara Hernández, Francisco; Sociedad Colombiana de Entomología - Socolen; Universidad del Valle; Montoya Lerma, James
    The whitefly Trialeurodes vaporariorum, an economically important pest in vegetables, is managed with synthetic pesticides and has generated resistance with adverse effects on the environment. In the search for alternative management, adult repellence with raw extracts (methanol, ethanol, dichloromethano, and hexane) essential oils, and major compounds of clove and pepper was tested. For this, a treated tomato leaf was placed at concentrations of 1.0 to 0.000001 % within a 1 L beaker containing a 10 mL flask with water. Subsecuently, 20 adults of 2 d of age were introduced. After 3 to 72 h, the posed adults were quantified, and repellence was determined from the difference. The raw extracts, essential oils, and major compounds of clove and pepper repel from 32.5 to 90.2 % of the adult population in 3 to 72 h. The cloves and pepper EO have a better repellent effect than raw extracts and secondary compounds, since they manage to repel 46.2 % to 100 %. The clove EO at the concentration of 1.0 % achieves 100 % repellency at 48 and 72 h after application, while the pepper EO reaches 97.5 % at 72 h after application; in practice, ethanolic crude extract of both plants should be used at a concentration of 0.000001 % since they can repel 38.7 to 87.5 % of adults, from 3 to 72 h, and its repellent effect is maintained; also, it is easier to acquire, safer for the operator, distributor and consumer; and is considered a solvent for the extraction of secondary compounds in organic farming standards.
  • Miniatura
    PublicaciónAcceso abierto
    Use of andiroba oil to control Anastrepha fraterculus (Diptera: Tephritidae) in different fruit hosts.
    (Universidad del Valle, 2021-02-03) Wille, Cleiton Luiz; Machado da Rosa, Joatan; Wille, Paulo Eduardo; Brillinger, Dahise; Franco, Cláudio Roberto; Boff, Pedro; Souza Gonçalves, Paulo Antônio de; Carissimi Boff, Mari Inês; Sociedad Colombiana de Entomología - Socolen; Universidad del Valle; Montoya Lerma, James
    Control of Anastrepha fraterculus (Diptera: Tephritidae) is usually accomplished with synthetic insecticides, which can be a problem considering exportation of fruits. This study aimed to evaluate mortality and offspring effects on A. fraterculus using peach, strawberry guava and apple fruits treated with andiroba (Carapa guianensis) oil. Higher mortality rate was observed when compared to control on strawberry guava and apple fruits treated with andiroba oil (18.4 % and 35.0 % points more than the control). The mean number of pupae observed in the offspring was inferior to the control on strawberry guava and apple fruits treated with andiroba oil (100 % control) and, on peach fruits (68.3 % fewer pupae). Andiroba oil shows promising results as an alternative product to control A. fraterculus. Studies are still needed especially considering the effectiveness of andiroba oil under field conditions.