Evaluation of neem-based nanoformulations as alternative to control fall armyworm

Detalhes bibliográficos
Autor(a) principal: Giongo,Angelina Maria Marcomini
Data de Publicação: 2016
Outros Autores: Vendramim,José Djair, Forim,Moacir Rossi
Tipo de documento: Artigo
Idioma: eng
Título da fonte: Ciência e Agrotecnologia (Online)
Texto Completo: http://old.scielo.br/scielo.php?script=sci_arttext&pid=S1413-70542016000100026
Resumo: ABSTRACT Neem (Azadirachta indica A. Juss.) based insecticides are efficient for the control of various pest species, but their low residual effect and the lack of standardized formulations are problems for field use. Nanoformulations of neem in colloidal suspension or powder, containing the polymers poly (ε-caprolactone) (PCL), poly (β-hidroxibutirate) (PHB) or poly (methyl methacrylate) (PMMA), in capsules or spheres, were developed in order to reduce biodegradation of the active neem compounds and improve their residual effect. Corn leaves treated with the nanoformulations were offered to first instar larvae of fall armyworm during 10 days, observing mortality and larval weight and comparing it to a commercial neem oil and negative controls. The residual effect of the four most efficient nanoformulations was evaluated at 1, 3 and 7 days after spraying (DAS). Feeding preference tests with dual-choice (treatment vs. control) were performed with corn leaf disks at 1, 3 and 7 after DAS, and a preference index was determined 24 hours after larvae feeding on the disks. Some nanoformulations caused mortality up to 3 DAS and sublethal effects up to 7 DAS, but none outperformed the residual effect of commercial neem oil. All treatments showed phagodeterrence at 1 DAS, but this was lost over time. The short duration of the nanoformulations' efficacy suggests that there was little or no release of neem by the nanoparticles, so more studies are needed to improve the release kinetics of the nanoformulated products.
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spelling Evaluation of neem-based nanoformulations as alternative to control fall armywormAzadirachta indicaSpodoptera frugiperdapolymeric nanoparticlescontrolled-release formulations.ABSTRACT Neem (Azadirachta indica A. Juss.) based insecticides are efficient for the control of various pest species, but their low residual effect and the lack of standardized formulations are problems for field use. Nanoformulations of neem in colloidal suspension or powder, containing the polymers poly (ε-caprolactone) (PCL), poly (β-hidroxibutirate) (PHB) or poly (methyl methacrylate) (PMMA), in capsules or spheres, were developed in order to reduce biodegradation of the active neem compounds and improve their residual effect. Corn leaves treated with the nanoformulations were offered to first instar larvae of fall armyworm during 10 days, observing mortality and larval weight and comparing it to a commercial neem oil and negative controls. The residual effect of the four most efficient nanoformulations was evaluated at 1, 3 and 7 days after spraying (DAS). Feeding preference tests with dual-choice (treatment vs. control) were performed with corn leaf disks at 1, 3 and 7 after DAS, and a preference index was determined 24 hours after larvae feeding on the disks. Some nanoformulations caused mortality up to 3 DAS and sublethal effects up to 7 DAS, but none outperformed the residual effect of commercial neem oil. All treatments showed phagodeterrence at 1 DAS, but this was lost over time. The short duration of the nanoformulations' efficacy suggests that there was little or no release of neem by the nanoparticles, so more studies are needed to improve the release kinetics of the nanoformulated products.Editora da UFLA2016-02-01info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersiontext/htmlhttp://old.scielo.br/scielo.php?script=sci_arttext&pid=S1413-70542016000100026Ciência e Agrotecnologia v.40 n.1 2016reponame:Ciência e Agrotecnologia (Online)instname:Universidade Federal de Lavras (UFLA)instacron:UFLA10.1590/S1413-70542016000100002info:eu-repo/semantics/openAccessGiongo,Angelina Maria MarcominiVendramim,José DjairForim,Moacir Rossieng2016-05-10T00:00:00Zoai:scielo:S1413-70542016000100026Revistahttp://www.scielo.br/cagroPUBhttps://old.scielo.br/oai/scielo-oai.php||renpaiva@dbi.ufla.br|| editora@editora.ufla.br1981-18291413-7054opendoar:2022-11-22T16:31:26.497859Ciência e Agrotecnologia (Online) - Universidade Federal de Lavras (UFLA)true
dc.title.none.fl_str_mv Evaluation of neem-based nanoformulations as alternative to control fall armyworm
title Evaluation of neem-based nanoformulations as alternative to control fall armyworm
spellingShingle Evaluation of neem-based nanoformulations as alternative to control fall armyworm
Giongo,Angelina Maria Marcomini
Azadirachta indica
Spodoptera frugiperda
polymeric nanoparticles
controlled-release formulations.
title_short Evaluation of neem-based nanoformulations as alternative to control fall armyworm
title_full Evaluation of neem-based nanoformulations as alternative to control fall armyworm
title_fullStr Evaluation of neem-based nanoformulations as alternative to control fall armyworm
title_full_unstemmed Evaluation of neem-based nanoformulations as alternative to control fall armyworm
title_sort Evaluation of neem-based nanoformulations as alternative to control fall armyworm
author Giongo,Angelina Maria Marcomini
author_facet Giongo,Angelina Maria Marcomini
Vendramim,José Djair
Forim,Moacir Rossi
author_role author
author2 Vendramim,José Djair
Forim,Moacir Rossi
author2_role author
author
dc.contributor.author.fl_str_mv Giongo,Angelina Maria Marcomini
Vendramim,José Djair
Forim,Moacir Rossi
dc.subject.por.fl_str_mv Azadirachta indica
Spodoptera frugiperda
polymeric nanoparticles
controlled-release formulations.
topic Azadirachta indica
Spodoptera frugiperda
polymeric nanoparticles
controlled-release formulations.
description ABSTRACT Neem (Azadirachta indica A. Juss.) based insecticides are efficient for the control of various pest species, but their low residual effect and the lack of standardized formulations are problems for field use. Nanoformulations of neem in colloidal suspension or powder, containing the polymers poly (ε-caprolactone) (PCL), poly (β-hidroxibutirate) (PHB) or poly (methyl methacrylate) (PMMA), in capsules or spheres, were developed in order to reduce biodegradation of the active neem compounds and improve their residual effect. Corn leaves treated with the nanoformulations were offered to first instar larvae of fall armyworm during 10 days, observing mortality and larval weight and comparing it to a commercial neem oil and negative controls. The residual effect of the four most efficient nanoformulations was evaluated at 1, 3 and 7 days after spraying (DAS). Feeding preference tests with dual-choice (treatment vs. control) were performed with corn leaf disks at 1, 3 and 7 after DAS, and a preference index was determined 24 hours after larvae feeding on the disks. Some nanoformulations caused mortality up to 3 DAS and sublethal effects up to 7 DAS, but none outperformed the residual effect of commercial neem oil. All treatments showed phagodeterrence at 1 DAS, but this was lost over time. The short duration of the nanoformulations' efficacy suggests that there was little or no release of neem by the nanoparticles, so more studies are needed to improve the release kinetics of the nanoformulated products.
publishDate 2016
dc.date.none.fl_str_mv 2016-02-01
dc.type.driver.fl_str_mv info:eu-repo/semantics/article
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dc.identifier.uri.fl_str_mv http://old.scielo.br/scielo.php?script=sci_arttext&pid=S1413-70542016000100026
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dc.language.iso.fl_str_mv eng
language eng
dc.relation.none.fl_str_mv 10.1590/S1413-70542016000100002
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dc.publisher.none.fl_str_mv Editora da UFLA
publisher.none.fl_str_mv Editora da UFLA
dc.source.none.fl_str_mv Ciência e Agrotecnologia v.40 n.1 2016
reponame:Ciência e Agrotecnologia (Online)
instname:Universidade Federal de Lavras (UFLA)
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reponame_str Ciência e Agrotecnologia (Online)
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