Efeito da mistura de teflubenzuron e adjuvantes em linhagem resistente e suscetível de Chrysodeixis includens (lepidoptera: noctuidae) a benzoilureias
Autor(a) principal: | |
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Data de Publicação: | 2020 |
Tipo de documento: | Dissertação |
Idioma: | por |
Título da fonte: | Manancial - Repositório Digital da UFSM |
dARK ID: | ark:/26339/001300000kw2z |
Texto Completo: | http://repositorio.ufsm.br/handle/1/23560 |
Resumo: | The soybean looper, Chrysodeixis includens (Walker, [1858]) (Lepidoptera: Noctuidae), is one of the main defoliating pest of soybean crop. The main management strategies of this species involves the use of chemical insecticides. Recently, it was been reported that this species field-evolved resistance to chitin synthesis inhibitor insecticides used in soybean crop in Brazil. Based on this, the objective of this study was to evaluate whether adjuvants improve the performance of insecticides in the control of insect pests and also to evaluate the biological effects of adjuvants on resistant and susceptible strains of C. includens to the chitin biosynthesis inhibitor teflubenzuron. In the first article, it was compiled in a bibliographic the effects os adjuvants on the performance of insecticides aaplied to control insect pests. It was found that adjuvants alter the physicochemical characteristics of the insecticide spray, reducing the surface tension, decreasing the contact angle and stabilizing the pH. The addition of adjuvants to the insecticide spray can also increase the control efficacy, but this depends on the insecticide, crop and target pest. In the second article, bioassays were conducted to assess the effects of adjuvants added to teflubenzuron spray on the mortality of C. includens strains (resistant, heterozygous, and susceptible to chitin biosynthesis inhibitors). Using chromatography analysis, it was also evaluated the amount of teflubenzuron deposited on soybean leaves when applied in combination with adjuvants. In diet bioassays, the lethal concentration of teflubenzuron was lower for the susceptible strain of C. includens when adjuvants was added to the spray (LC50 ranging from 0.36 to 0.53 μg a.i./cm2 of diet with adjuvants vs 0.73 μg a.i./cm2 of diet without adjuvants). However, no relevant effects of adjuvants in association with teflubenzuron was verified on heterozygous (LC50 = 1.35 to 1.18 μg a.i./cm2 of diet) and resistant (mortalityfrom 39.0 to 48.3% at the maximum concentration tested) strains. In bioassays with soybean leaves, even those in the upper third part of the plant canopy, in which there was a greater deposition of teflubenzuron (3.4 mg/kg vs < 1.7 mg/kg), the mortality of susceptible (97.5 to 100%), heterozygous (77.5 to 82.5%) and resistant (12.5 to 20.0%) strains, with and without adjuvants on the insecticide spray, were similar. Therefore, it is concluded that adjuvants tested do not increase the mortality of susceptible and resistant strains of C. includens to the chitin biosynthesis inhibitor teflubenzuron. |
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Efeito da mistura de teflubenzuron e adjuvantes em linhagem resistente e suscetível de Chrysodeixis includens (lepidoptera: noctuidae) a benzoilureiasEffects of the mixture of teflubenzuron and adjuvants on resistant and susceptible strains of Chrysodeixis includens (lepidoptera: noctuidae) to benzoylureasInseticidaFalsa-medideiraSuscetibilidadeMistura em tanqueInsecticideSoybean looperSusceptibilityTank-mixCNPQ::CIENCIAS AGRARIAS::AGRONOMIAThe soybean looper, Chrysodeixis includens (Walker, [1858]) (Lepidoptera: Noctuidae), is one of the main defoliating pest of soybean crop. The main management strategies of this species involves the use of chemical insecticides. Recently, it was been reported that this species field-evolved resistance to chitin synthesis inhibitor insecticides used in soybean crop in Brazil. Based on this, the objective of this study was to evaluate whether adjuvants improve the performance of insecticides in the control of insect pests and also to evaluate the biological effects of adjuvants on resistant and susceptible strains of C. includens to the chitin biosynthesis inhibitor teflubenzuron. In the first article, it was compiled in a bibliographic the effects os adjuvants on the performance of insecticides aaplied to control insect pests. It was found that adjuvants alter the physicochemical characteristics of the insecticide spray, reducing the surface tension, decreasing the contact angle and stabilizing the pH. The addition of adjuvants to the insecticide spray can also increase the control efficacy, but this depends on the insecticide, crop and target pest. In the second article, bioassays were conducted to assess the effects of adjuvants added to teflubenzuron spray on the mortality of C. includens strains (resistant, heterozygous, and susceptible to chitin biosynthesis inhibitors). Using chromatography analysis, it was also evaluated the amount of teflubenzuron deposited on soybean leaves when applied in combination with adjuvants. In diet bioassays, the lethal concentration of teflubenzuron was lower for the susceptible strain of C. includens when adjuvants was added to the spray (LC50 ranging from 0.36 to 0.53 μg a.i./cm2 of diet with adjuvants vs 0.73 μg a.i./cm2 of diet without adjuvants). However, no relevant effects of adjuvants in association with teflubenzuron was verified on heterozygous (LC50 = 1.35 to 1.18 μg a.i./cm2 of diet) and resistant (mortalityfrom 39.0 to 48.3% at the maximum concentration tested) strains. In bioassays with soybean leaves, even those in the upper third part of the plant canopy, in which there was a greater deposition of teflubenzuron (3.4 mg/kg vs < 1.7 mg/kg), the mortality of susceptible (97.5 to 100%), heterozygous (77.5 to 82.5%) and resistant (12.5 to 20.0%) strains, with and without adjuvants on the insecticide spray, were similar. Therefore, it is concluded that adjuvants tested do not increase the mortality of susceptible and resistant strains of C. includens to the chitin biosynthesis inhibitor teflubenzuron.Coordenação de Aperfeiçoamento de Pessoal de Nível Superior - CAPESA lagarta falsa-medideira, Chrysodeixis includens (Walker, [1858]) (Lepidoptera: Noctuidae), é uma das principais lagartas desfolhadoras da cultura da soja. Uma das estratégias de manejo dessa espécie envolve o uso de inseticidas. Recentemente foi reportado que essa espécie evoluiu para resistência aos inseticidas inibidores da biossíntese de quitina utilizados na cultura da soja no Brasil. Diante disso, objetivou-se analisar se alguns adjuvantes melhoram a performance dos inseticidas no controle de insetos-praga e avaliar os efeitos dos adjuvantes sobre linhagens resistentes e suscetíveis de C. includens ao inibidor de biossíntese de quitina teflubenzuron. No primeiro artigo compilou-se numa revisão bibliográfica os estudos com o uso de adjuvantes adicionados à calda de inseticidas para controle de insetos-praga. Constatou- se que os adjuvantes alteram as características físico-químicas das caldas inseticidasreduzindo a tensão superficial, diminuindo o ângulo de contato e estabilizando o pH. A adição de adjuvantes nas caldas de inseticidas também pode aumentar a eficácia de controle, mas isso depende do inseticida, cultura e praga-alvo. No segundo artigo foram conduzidos bioensaios para avaliar se os adjuvantes adicionados à calda inseticida de teflubenzuron ocasionam aumento na mortalidade de linhagens de C. includens (resistentes, heterozigotos e suscetíveis a inibidores da biossíntese de quitina). Com o uso de análises cromatográficas também avaliou- se a quantidade de teflubenzuron depositado nas folhas da soja quando do uso de adjuvantes. Em bioensaios com dieta artificial, a concentração letal de teflubenzuron foi menor para a linhagem suscetível de C. includens quando da presença dos adjuvantes (CL50 variando de 0,36 a 0,53 μg i.a./cm2 de dieta com adjuvantes vs 0,73 μg i.a./cm2 de dieta sem adjuvantes). Entretanto, nenhum efeito relevante dos adjuvantes adicionados a calda inseticida de teflubenzuron foi detectado para as linhagens de C. includens de genótipo heterozigoto (CL50 = 1,18 a 1,35 μg i.a./cm2) e resistente (mortalidade de 39.0 a 48.3% na máxima concentração testada). Em bioensaios com folhas de soja, mesmo aquelas do terço superior, nas quais houve uma maior deposição de teflubenzuron (3,4 mg/kg vs < 1,7mg/kg), a mortalidade de suscetíveis (97,5 a 100%), heterozigotos (77,5 a 82,5%) e resistentes (12,5 a 20,0%) foi similar quando da presença ou ausência de adjuvantes na calda inseticida. Diante disso, conclui-se que os adjuvantes testados não ocasionam aumento na mortalidade de linhagens de C. includens suscetíveis e resistentes ao inibidor da biossíntese de quitina teflubenzuron.Universidade Federal de Santa MariaBrasilAgronomiaUFSMPrograma de Pós-Graduação em AgronomiaCentro de Ciências RuraisBernardi, Oderleihttp://lattes.cnpq.br/3085175517473196Boller, WalterMelo, Adriano ArruéHettwer, Bruna Laise2022-01-18T12:04:20Z2022-01-18T12:04:20Z2020-10-09info:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/masterThesisapplication/pdfhttp://repositorio.ufsm.br/handle/1/23560ark:/26339/001300000kw2zporAttribution-NoDerivatives 4.0 Internationalhttp://creativecommons.org/licenses/by-nd/4.0/info:eu-repo/semantics/openAccessreponame:Manancial - Repositório Digital da UFSMinstname:Universidade Federal de Santa Maria (UFSM)instacron:UFSM2022-01-18T12:06:46Zoai:repositorio.ufsm.br:1/23560Biblioteca Digital de Teses e Dissertaçõeshttps://repositorio.ufsm.br/ONGhttps://repositorio.ufsm.br/oai/requestatendimento.sib@ufsm.br||tedebc@gmail.comopendoar:2022-01-18T12:06:46Manancial - Repositório Digital da UFSM - Universidade Federal de Santa Maria (UFSM)false |
dc.title.none.fl_str_mv |
Efeito da mistura de teflubenzuron e adjuvantes em linhagem resistente e suscetível de Chrysodeixis includens (lepidoptera: noctuidae) a benzoilureias Effects of the mixture of teflubenzuron and adjuvants on resistant and susceptible strains of Chrysodeixis includens (lepidoptera: noctuidae) to benzoylureas |
title |
Efeito da mistura de teflubenzuron e adjuvantes em linhagem resistente e suscetível de Chrysodeixis includens (lepidoptera: noctuidae) a benzoilureias |
spellingShingle |
Efeito da mistura de teflubenzuron e adjuvantes em linhagem resistente e suscetível de Chrysodeixis includens (lepidoptera: noctuidae) a benzoilureias Hettwer, Bruna Laise Inseticida Falsa-medideira Suscetibilidade Mistura em tanque Insecticide Soybean looper Susceptibility Tank-mix CNPQ::CIENCIAS AGRARIAS::AGRONOMIA |
title_short |
Efeito da mistura de teflubenzuron e adjuvantes em linhagem resistente e suscetível de Chrysodeixis includens (lepidoptera: noctuidae) a benzoilureias |
title_full |
Efeito da mistura de teflubenzuron e adjuvantes em linhagem resistente e suscetível de Chrysodeixis includens (lepidoptera: noctuidae) a benzoilureias |
title_fullStr |
Efeito da mistura de teflubenzuron e adjuvantes em linhagem resistente e suscetível de Chrysodeixis includens (lepidoptera: noctuidae) a benzoilureias |
title_full_unstemmed |
Efeito da mistura de teflubenzuron e adjuvantes em linhagem resistente e suscetível de Chrysodeixis includens (lepidoptera: noctuidae) a benzoilureias |
title_sort |
Efeito da mistura de teflubenzuron e adjuvantes em linhagem resistente e suscetível de Chrysodeixis includens (lepidoptera: noctuidae) a benzoilureias |
author |
Hettwer, Bruna Laise |
author_facet |
Hettwer, Bruna Laise |
author_role |
author |
dc.contributor.none.fl_str_mv |
Bernardi, Oderlei http://lattes.cnpq.br/3085175517473196 Boller, Walter Melo, Adriano Arrué |
dc.contributor.author.fl_str_mv |
Hettwer, Bruna Laise |
dc.subject.por.fl_str_mv |
Inseticida Falsa-medideira Suscetibilidade Mistura em tanque Insecticide Soybean looper Susceptibility Tank-mix CNPQ::CIENCIAS AGRARIAS::AGRONOMIA |
topic |
Inseticida Falsa-medideira Suscetibilidade Mistura em tanque Insecticide Soybean looper Susceptibility Tank-mix CNPQ::CIENCIAS AGRARIAS::AGRONOMIA |
description |
The soybean looper, Chrysodeixis includens (Walker, [1858]) (Lepidoptera: Noctuidae), is one of the main defoliating pest of soybean crop. The main management strategies of this species involves the use of chemical insecticides. Recently, it was been reported that this species field-evolved resistance to chitin synthesis inhibitor insecticides used in soybean crop in Brazil. Based on this, the objective of this study was to evaluate whether adjuvants improve the performance of insecticides in the control of insect pests and also to evaluate the biological effects of adjuvants on resistant and susceptible strains of C. includens to the chitin biosynthesis inhibitor teflubenzuron. In the first article, it was compiled in a bibliographic the effects os adjuvants on the performance of insecticides aaplied to control insect pests. It was found that adjuvants alter the physicochemical characteristics of the insecticide spray, reducing the surface tension, decreasing the contact angle and stabilizing the pH. The addition of adjuvants to the insecticide spray can also increase the control efficacy, but this depends on the insecticide, crop and target pest. In the second article, bioassays were conducted to assess the effects of adjuvants added to teflubenzuron spray on the mortality of C. includens strains (resistant, heterozygous, and susceptible to chitin biosynthesis inhibitors). Using chromatography analysis, it was also evaluated the amount of teflubenzuron deposited on soybean leaves when applied in combination with adjuvants. In diet bioassays, the lethal concentration of teflubenzuron was lower for the susceptible strain of C. includens when adjuvants was added to the spray (LC50 ranging from 0.36 to 0.53 μg a.i./cm2 of diet with adjuvants vs 0.73 μg a.i./cm2 of diet without adjuvants). However, no relevant effects of adjuvants in association with teflubenzuron was verified on heterozygous (LC50 = 1.35 to 1.18 μg a.i./cm2 of diet) and resistant (mortalityfrom 39.0 to 48.3% at the maximum concentration tested) strains. In bioassays with soybean leaves, even those in the upper third part of the plant canopy, in which there was a greater deposition of teflubenzuron (3.4 mg/kg vs < 1.7 mg/kg), the mortality of susceptible (97.5 to 100%), heterozygous (77.5 to 82.5%) and resistant (12.5 to 20.0%) strains, with and without adjuvants on the insecticide spray, were similar. Therefore, it is concluded that adjuvants tested do not increase the mortality of susceptible and resistant strains of C. includens to the chitin biosynthesis inhibitor teflubenzuron. |
publishDate |
2020 |
dc.date.none.fl_str_mv |
2020-10-09 2022-01-18T12:04:20Z 2022-01-18T12:04:20Z |
dc.type.status.fl_str_mv |
info:eu-repo/semantics/publishedVersion |
dc.type.driver.fl_str_mv |
info:eu-repo/semantics/masterThesis |
format |
masterThesis |
status_str |
publishedVersion |
dc.identifier.uri.fl_str_mv |
http://repositorio.ufsm.br/handle/1/23560 |
dc.identifier.dark.fl_str_mv |
ark:/26339/001300000kw2z |
url |
http://repositorio.ufsm.br/handle/1/23560 |
identifier_str_mv |
ark:/26339/001300000kw2z |
dc.language.iso.fl_str_mv |
por |
language |
por |
dc.rights.driver.fl_str_mv |
Attribution-NoDerivatives 4.0 International http://creativecommons.org/licenses/by-nd/4.0/ info:eu-repo/semantics/openAccess |
rights_invalid_str_mv |
Attribution-NoDerivatives 4.0 International http://creativecommons.org/licenses/by-nd/4.0/ |
eu_rights_str_mv |
openAccess |
dc.format.none.fl_str_mv |
application/pdf |
dc.publisher.none.fl_str_mv |
Universidade Federal de Santa Maria Brasil Agronomia UFSM Programa de Pós-Graduação em Agronomia Centro de Ciências Rurais |
publisher.none.fl_str_mv |
Universidade Federal de Santa Maria Brasil Agronomia UFSM Programa de Pós-Graduação em Agronomia Centro de Ciências Rurais |
dc.source.none.fl_str_mv |
reponame:Manancial - Repositório Digital da UFSM instname:Universidade Federal de Santa Maria (UFSM) instacron:UFSM |
instname_str |
Universidade Federal de Santa Maria (UFSM) |
instacron_str |
UFSM |
institution |
UFSM |
reponame_str |
Manancial - Repositório Digital da UFSM |
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Manancial - Repositório Digital da UFSM |
repository.name.fl_str_mv |
Manancial - Repositório Digital da UFSM - Universidade Federal de Santa Maria (UFSM) |
repository.mail.fl_str_mv |
atendimento.sib@ufsm.br||tedebc@gmail.com |
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1815172358611140608 |