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      Insecticidal activity of marigold Tagetes patula plants and foliar extracts against the hemipteran pests, Lygus hesperus and Bemisia tabaci

      research-article
      Author(s): 1 , * , 2 , 1
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      Publication date (Electronic):
      Journal: PLoS ONE
      Publisher: Public Library of Science

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          Abstract

          The western tarnished plant bug, Lygus hesperus Knight (Hemiptera: Miridae) and the whitefly, Bemisia tabaci Gennadius (Hemiptera: Aleyrodidae) are key hemipteran pests of numerous crop plants throughout the western United States and Mexico. Management in the U.S. currently relies on only a few insecticides and is threatened by the evolution of resistance. New chemistries or alternative management strategies are needed to reduce selection pressure on current insecticides and enhance control. Here, we investigated the bio-insecticidal toxicity of the French marigold, Tagetes patula Linnaeus (Asterales: Asteraceae), against both L. hesperus and B. tabaci. Assays indicated significantly reduced survival of both pest species on T. patula plants, and in diet incorporation assays containing aqueous and methanolic marigold foliar extracts. Mortality was concentration-dependent, indicating the presence of one or more extractable toxicants. These data suggest that T. patula plants have insecticidal constituents that might be identified and developed as novel alternatives to conventional chemical treatments.

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          Botanical insecticides, deterrents, and repellents in modern agriculture and an increasingly regulated world.

          Murray Isman (2006)
          Botanical insecticides have long been touted as attractive alternatives to synthetic chemical insecticides for pest management because botanicals reputedly pose little threat to the environment or to human health. The body of scientific literature documenting bioactivity of plant derivatives to arthropod pests continues to expand, yet only a handful of botanicals are currently used in agriculture in the industrialized world, and there are few prospects for commercial development of new botanical products. Pyrethrum and neem are well established commercially, pesticides based on plant essential oils have recently entered the marketplace, and the use of rotenone appears to be waning. A number of plant substances have been considered for use as insect antifeedants or repellents, but apart from some natural mosquito repellents, little commercial success has ensued for plant substances that modify arthropod behavior. Several factors appear to limit the success of botanicals, most notably regulatory barriers and the availability of competing products (newer synthetics, fermentation products, microbials) that are cost-effective and relatively safe compared with their predecessors. In the context of agricultural pest management, botanical insecticides are best suited for use in organic food production in industrialized countries but can play a much greater role in the production and postharvest protection of food in developing countries.
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            Essential Oils as Ecofriendly Biopesticides? Challenges and Constraints.

            Roman Pavela, Giovanni Benelli (2016)
            Recently, a growing number of plant essential oils (EOs) have been tested against a wide range of arthropod pests with promising results. EOs showed high effectiveness, multiple mechanisms of action, low toxicity on non-target vertebrates and potential for the use of byproducts as reducing and stabilizing agents for the synthesis of nanopesticides. However, the number of commercial biopesticides based on EOs remains low. We analyze the main strengths and weaknesses arising from the use of EO-based biopesticides. Key challenges for future research include: (i) development of efficient stabilization processes (e.g., microencapsulation); (ii) simplification of the complex and costly biopesticide authorization requirements; and (iii) optimization of plant growing conditions and extraction processes leading to EOs of homogeneous chemical composition.
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              Associational Resistance and Associational Susceptibility: Having Right or Wrong Neighbors

              Pedro Barbosa, Jessica Hines-Beard, Ian Kaplan … (2009)
              Article 0 comments Cited 217 times – based on 0 reviews     Review now
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                Author and article information

                Contributors
                Jeffrey A. Fabrick:
                ORCID: http://orcid.org/0000-0002-3893-9545
                Role: ConceptualizationRole: Data curationRole: Formal analysisRole: Funding acquisitionRole: InvestigationRole: MethodologyRole: Project administrationRole: ResourcesRole: SupervisionRole: ValidationRole: VisualizationRole: Writing – original draftRole: Writing – review & editing
                Andrea J. Yool: Role: ConceptualizationRole: Writing – review & editing
                Dale W. Spurgeon: Role: Formal analysisRole: Writing – review & editing
                Nicolas Desneux: Role: Editor
                Journal
                Journal ID (nlm-ta): PLoS One
                Journal ID (iso-abbrev): PLoS ONE
                Journal ID (publisher-id): plos
                Journal ID (pmc): plosone
                Title: PLoS ONE
                Publisher: Public Library of Science (San Francisco, CA USA )
                ISSN (Electronic): 1932-6203
                Publication date (Electronic): 19 May 2020
                Publication date Collection: 2020
                Volume: 15
                Issue: 5
                Electronic Location Identifier: e0233511
                Affiliations
                [1 ] U.S. Department of Agriculture (USDA), Agricultural Research Service (ARS), U.S. Arid Land Agricultural Research Center, Maricopa, AZ, United States of America
                [2 ] Adelaide Medical School, University of Adelaide, Adelaide, SA, Australia
                Institut Sophia Agrobiotech, FRANCE
                Author notes

                Competing Interests: This research was supported in part by the Bayer CropScience AG Grants4Targets Grant Program (#2016-01-51). This does not alter our adherence to PLoS ONE policies on sharing data and materials.

                Author information
                http://orcid.org/0000-0002-3893-9545
                Article
                Publisher ID: PONE-D-19-30672
                DOI: 10.1371/journal.pone.0233511
                PMC ID: 7237031
                PubMed ID: 32428032
                SO-VID: f3fd0753-481b-49a1-b47d-22e224534a35
                License:

                This is an open access article, free of all copyright, and may be freely reproduced, distributed, transmitted, modified, built upon, or otherwise used by anyone for any lawful purpose. The work is made available under the Creative Commons CC0 public domain dedication.

                History
                Date received : 4 November 2019
                Date accepted : 6 May 2020
                Page count
                Figures: 4, Tables: 4, Pages: 15
                Funding
                This research was supported by the U.S. Department of Agriculture, Agricultural Research Service, National Program 304 – Crop Protection & Quarantine (#2020-22620-022-00D to JF and DS), Bayer CropScience AG Grants4Targets Grant (#2016-01-51 to JF), and the National Cotton Council (#2020-22620-021-16J to JF). The funders had no role in study design, data collection and analysis, decision to publish, or preparation of the manuscript.
                Categories
                Subject: Research Article
                Subject: Biology and Life Sciences
                Subject: Agriculture
                Subject: Agrochemicals
                Subject: Insecticides
                Subject: Biology and Life Sciences
                Subject: Nutrition
                Subject: Diet
                Subject: Medicine and Health Sciences
                Subject: Nutrition
                Subject: Diet
                Subject: Biology and Life Sciences
                Subject: Organisms
                Subject: Eukaryota
                Subject: Plants
                Subject: Flowering Plants
                Subject: Cotton
                Subject: Biology and Life Sciences
                Subject: Agriculture
                Subject: Pest Control
                Subject: Biology and Life Sciences
                Subject: Agriculture
                Subject: Pests
                Subject: Insect Pests
                Subject: Biology and Life Sciences
                Subject: Toxicology
                Subject: Toxicity
                Subject: Medicine and Health Sciences
                Subject: Pathology and Laboratory Medicine
                Subject: Toxicology
                Subject: Toxicity
                Subject: Biology and Life Sciences
                Subject: Agriculture
                Subject: Crop Science
                Subject: Crops
                Subject: Biology and Life Sciences
                Subject: Plant Science
                Subject: Plant Anatomy
                Subject: Leaves
                Custom metadata
                Data Availability All relevant data are within the manuscript.

                ScienceOpen disciplines: Uncategorized
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                ScienceOpen disciplines: Uncategorized

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