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      Insecticide effect of leaf extracts from Schinus molle on larvae of Gonipterus platensis Translated title: Efecto insecticida de extractos de hojas de Schinus molle en larvas de Gonipterus platensis

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          Abstract

          ABSTRACT The insecticide effect of new and mature leaf extracts obtained with ethanol and water from Schinus molle L. (Anacardiaceae) were evaluated at 0.5 - 3.4% w/v and 0.5 - 4.8% w/v, respectively, onto larvae third instar of Gonipterus platensis Marelli (Coleoptera: Curculionidae), an important defoliating pest on eucalypt (Eucalyptus spp., Myrtaceae) plantations. The extracts were applied to eucalypt leaves that were given as food to the larvae, and their effects were determined by determining mortality and the LC50 and LT50 by Probit analysis on the larvae. Both extracts were effectives, especially those from new leaves; the ethanol extract from them caused the greatest mortality. The highest concentrations of the water and ethanol extracts (3.4 and 4.8% w/v, respectively) caused average mortality of 100 and 88.9% with new leaf extracts, and 94.7 and 86.4% with mature ones, respectively. The insecticide effectiveness 6 d after treatment in decreasing order were: new leaves-ethanol (LC50 = 0.79% w/v), new leaves-water (LC50= 2.08% w/v), mature leaves-ethanol (LC50=0.63% w/v) mature leaves-water (LC50=12.01% w/v). The LT50 at 1.7% w/v was 5.2 d in new leaves-ethanol. These results of the insecticide effect on G. platensis larvae allow to consider the leaf extracts from S. molle an interesting alternative as a bioinsecticide source for an integrated pest management system of this pest.

          Translated abstract

          RESUMEN Se evaluaron extractos insecticidas etanólicos y acuosos obtenidos desde hojas jóvenes y maduras de Schinus molle L. (Anacardiaceae), en concentraciones de 0,5 a 3,4% p/v y 0,5 a 4,8% p/v, respectivamente, sobre larvas de tercer estadio de Gonipterus platensis (Coleoptera: Curculionidae), importante plaga defoliadora de eucaliptos (Eucalyptus spp., Myrtaceae). Los extractos se aplicaron sobre hojas de eucalipto como alimento para las larvas, y su efectividad se determinó a través de la mortalidad y la determinación mediante análisis Probit de la concentración y tiempo letal (CL50 y TL50, respectivamente). Ambos extractos fueron eficaces contra las larvas, especialmente aquellos obtenidos de hojas jóvenes; el extracto etanólico de estas mismas hojas causó la mayor mortalidad. Con las mayores concentraciones de los extractos en etanol (3,4% p/v) y agua (4,8% p/v) se obtuvieron mortalidades promedio de 100 y 88,9% con hojas jóvenes, y 94,7 y 86,4% con hojas maduras, respectivamente. El orden decreciente de la efectividad insecticida de los extractos de hojas y solvente fue: hojas joven-etanol (CL50= 0,79% p/v), hojas joven-agua (CL50= 2,08% p/v), hojas maduras-etanol (CL50= 2,63% p/v) y hojas maduras-agua (CL50= 12,01% p/v) a seis días después de la aplicación de los extractos. El TL50 fue 5,2 días a la concentración de extractos de hojas nuevas en etanol de 1,7%p/v. Las propiedades insecticidas de los extractos de hojas de S. molle sobre las larvas de G. scutellatus permiten considerar a esta planta una alternativa interesante como fuente bioinsecticida para el sistema de manejo integrado de esta plaga.

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          Biological Activity of Essential Oils from Leaves and Fruits of Pepper Tree (Schinus molle L.) to Control Rice Weevil (Sitophilus oryzae L.)

          Rice weevil (Sitophilus oryzae L.) is a primary insect pest of stored grain. The development of resistance resulted in the application of synthetic insecticides. In recent years many plant essential oils have provided potential alternatives to currently used insect control agents. The Brazilian pepper tree (Schinus molle L. var. areira (L.) DC.) (Anacardiaceae) has different biological properties such as insecticidal activity. In this study, repellent, fumigant activity, nutritional indices, and feeding deterrent action were evaluated on S. oryzae adults. Filter paper impregnation was used to test fumigant toxicity, whereas treated whole wheat was used to evaluate repellent activity and a flour disk bioassay was done to evaluate feeding deterrent action and nutritional index alteration. Leaf essential oils showed repellent effects at both concentrations (0.04 and 0.4% w/w), while fruit essential oils lacked repellent activity. Both plant oils altered nutritional indices. Fruit essential oils had a strong feeding deterrent action (62%) while leaves had a slight effect (40.6%). With respect to fumigant activity, neither of the essential oils was found to be toxic.
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            Chemical composition, repellent and antimicrobial activity of Schinus molle L.

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              Metabolismo secundario de plantas. Reduca (Biología)

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                Author and article information

                Contributors
                Role: ND
                Role: ND
                Role: ND
                Role: ND
                Journal
                rfnam
                Revista Facultad Nacional de Agronomía, Medellín
                Rev.Fac.Nal.Agr.Medellín
                Facultad de Ciencias Agrarias - Universidad Nacional de Colombia (Medellín, Antioquia, Colombia )
                0304-2847
                September 2017
                : 70
                : 3
                : 8263-8270
                Affiliations
                [1] Santiago Santiago de Chile orgnameUniversidad de Chile orgdiv1Facultad de Ciencias Agronómicas orgdiv2Dept. Agroindustria y Enología Chile ichiffelle@ 123456gmail.com
                [3] Santiago Santiago de Chile orgnameUniversidad de Chile orgdiv1Facultad de Ciencias Agronómicas orgdiv2Dept. Sanidad Vegetal Chile
                [2] Santiago Santiago de Chile orgnameUniversidad de Chile orgdiv1Facultad de Ciencias Forestales y Conservación de la Naturaleza orgdiv2Dept. Silvicultura y Conservación de la Naturaleza Chile
                Article
                S0304-28472017000308263
                10.15446/rfna.v70n3.58272
                e3bfc905-dc1e-49d8-b59d-699ef8006a9c

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

                History
                : 21 April 2017
                : 30 August 2016
                Page count
                Figures: 0, Tables: 0, Equations: 0, References: 27, Pages: 8
                Product

                SciELO Colombia


                Schinus molle,Gonipterus platensis,Insecticidas botánicos,Manejo integrado de plagas,Botanical insecticides,Integrated pest management

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