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Calcium-alginate beads as a formulation for the application of entomopathogenic nematodes to control rootworms
Entomopathogenic nematodes (EPN) have great potential as biological control agents against root-feeding insects. They have a rapid and long-lasting mode of action, minimal adverse effects on the environment and can be readily mass-produced. However, they have a relatively short shelf-life and are su...
Autores principales: | , , , , , |
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Formato: | Online Artículo Texto |
Lenguaje: | English |
Publicado: |
Springer Berlin Heidelberg
2021
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Materias: | |
Acceso en línea: | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8550308/ https://www.ncbi.nlm.nih.gov/pubmed/34720786 http://dx.doi.org/10.1007/s10340-021-01349-4 |
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author | Kim, Jinwon Hiltpold, Ivan Jaffuel, Geoffrey Sbaiti, Ilham Hibbard, Bruce E. Turlings, Ted C. J. |
author_facet | Kim, Jinwon Hiltpold, Ivan Jaffuel, Geoffrey Sbaiti, Ilham Hibbard, Bruce E. Turlings, Ted C. J. |
author_sort | Kim, Jinwon |
collection | PubMed |
description | Entomopathogenic nematodes (EPN) have great potential as biological control agents against root-feeding insects. They have a rapid and long-lasting mode of action, minimal adverse effects on the environment and can be readily mass-produced. However, they have a relatively short shelf-life and are susceptible to desiccation and UV light. These shortcomings may be overcome by encapsulating EPN in Ca(2+)-alginate hydrogels, which have been shown to provide a humid and UV protective shelter. Yet, current Ca(2+)-alginate formulations do not keep EPN vigorous and infectious for a prolonged period of time and do not allow for their controlled release upon application. Here, we introduce solid Ca(2+)-alginate beads which we supplemented with glycerol to better retain the EPN during storage and to ensure a steady release when applied in soil. Glycerol-induced metabolic arrest in EPN (Heterorhabditis bacteriophora) resulting in quiescence and total retainment of EPN when added to beads made with 0.5% sodium alginate and 2% CaCl(2)·2H(2)O solutions. More than 4,000 EPN could be embedded in a single 4–5-mm diameter bead, and quiescence could be broken by adding water, after which the EPN readily emerged from the beads. In a field trial, the EPN beads were as effective in reducing root damage by the western corn rootworm (WCR, Diabrotica virgifera virgifera) as EPN that were applied in water. Although further improvements are desirable, we conclude that Ca(2+)-alginate beads can provide an effective and practical way to apply EPN for the control of WCR larvae. SUPPLEMENTARY INFORMATION: The online version contains supplementary material available at 10.1007/s10340-021-01349-4. |
format | Online Article Text |
id | pubmed-8550308 |
institution | National Center for Biotechnology Information |
language | English |
publishDate | 2021 |
publisher | Springer Berlin Heidelberg |
record_format | MEDLINE/PubMed |
spelling | pubmed-85503082021-10-29 Calcium-alginate beads as a formulation for the application of entomopathogenic nematodes to control rootworms Kim, Jinwon Hiltpold, Ivan Jaffuel, Geoffrey Sbaiti, Ilham Hibbard, Bruce E. Turlings, Ted C. J. J Pest Sci (2004) Original Paper Entomopathogenic nematodes (EPN) have great potential as biological control agents against root-feeding insects. They have a rapid and long-lasting mode of action, minimal adverse effects on the environment and can be readily mass-produced. However, they have a relatively short shelf-life and are susceptible to desiccation and UV light. These shortcomings may be overcome by encapsulating EPN in Ca(2+)-alginate hydrogels, which have been shown to provide a humid and UV protective shelter. Yet, current Ca(2+)-alginate formulations do not keep EPN vigorous and infectious for a prolonged period of time and do not allow for their controlled release upon application. Here, we introduce solid Ca(2+)-alginate beads which we supplemented with glycerol to better retain the EPN during storage and to ensure a steady release when applied in soil. Glycerol-induced metabolic arrest in EPN (Heterorhabditis bacteriophora) resulting in quiescence and total retainment of EPN when added to beads made with 0.5% sodium alginate and 2% CaCl(2)·2H(2)O solutions. More than 4,000 EPN could be embedded in a single 4–5-mm diameter bead, and quiescence could be broken by adding water, after which the EPN readily emerged from the beads. In a field trial, the EPN beads were as effective in reducing root damage by the western corn rootworm (WCR, Diabrotica virgifera virgifera) as EPN that were applied in water. Although further improvements are desirable, we conclude that Ca(2+)-alginate beads can provide an effective and practical way to apply EPN for the control of WCR larvae. SUPPLEMENTARY INFORMATION: The online version contains supplementary material available at 10.1007/s10340-021-01349-4. Springer Berlin Heidelberg 2021-02-26 2021 /pmc/articles/PMC8550308/ /pubmed/34720786 http://dx.doi.org/10.1007/s10340-021-01349-4 Text en © The Author(s) 2021 https://creativecommons.org/licenses/by/4.0/Open AccessThis article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons licence, and indicate if changes were made. The images or other third party material in this article are included in the article's Creative Commons licence, unless indicated otherwise in a credit line to the material. If material is not included in the article's Creative Commons licence and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this licence, visit http://creativecommons.org/licenses/by/4.0/ (https://creativecommons.org/licenses/by/4.0/) . |
spellingShingle | Original Paper Kim, Jinwon Hiltpold, Ivan Jaffuel, Geoffrey Sbaiti, Ilham Hibbard, Bruce E. Turlings, Ted C. J. Calcium-alginate beads as a formulation for the application of entomopathogenic nematodes to control rootworms |
title | Calcium-alginate beads as a formulation for the application of entomopathogenic nematodes to control rootworms |
title_full | Calcium-alginate beads as a formulation for the application of entomopathogenic nematodes to control rootworms |
title_fullStr | Calcium-alginate beads as a formulation for the application of entomopathogenic nematodes to control rootworms |
title_full_unstemmed | Calcium-alginate beads as a formulation for the application of entomopathogenic nematodes to control rootworms |
title_short | Calcium-alginate beads as a formulation for the application of entomopathogenic nematodes to control rootworms |
title_sort | calcium-alginate beads as a formulation for the application of entomopathogenic nematodes to control rootworms |
topic | Original Paper |
url | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8550308/ https://www.ncbi.nlm.nih.gov/pubmed/34720786 http://dx.doi.org/10.1007/s10340-021-01349-4 |
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