População, danos e parasitoides larvais de spodoptera frugiperda (j. e smith) (lepidoptera: noctuidae) em milho bt e não-bt
Autor(a) principal: | |
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Data de Publicação: | 2012 |
Tipo de documento: | Dissertação |
Idioma: | por |
Título da fonte: | Manancial - Repositório Digital da UFSM |
Texto Completo: | http://repositorio.ufsm.br/handle/1/5050 |
Resumo: | The occurrence of Spodoptera frugiperda (J. E. Smith) (Lepidoptera: Noctuidae), the Fall armyworm, has led to increased adoption of Bt maize genotypes in Brazil. However, the field impacts on parasitoids of using these genotypes, especially those associated with the larval stage of this insect pest, are little known. The aim of this study was to evaluate two different Bt maize genotypes and its isoline (non-Bt) on Fall armyworm larvae population, its damage to maize plants and its larval parasitoids in early and late cropping season (sowing dates). The experiments were conducted in areas of Universidade Federal de Santa Maria (UFSM), Santa Maria, Rio Grande do Sul State, which were grown three maize areas in both early an late sowing, with the treatments: control (non-Bt), YieldGard®, expressing the Bt toxin Cry1Ab and Herculex®, which expresses the Bt toxin Cry1F, all comercial hybrids 30F53 and isolines among them. The area of each treatment was divided into 20 points, 36 m2 each, composed by 12 rows of 6 m, where 4 plants per point were randomly sampled, totaling 80 sampled plants per treatment. In early and late season, 14 maize plant surveys were made and afterwards transferred to the laboratory and evaluated for: number of S. frugiperda egg masses, total and percentage of collected larvae, in different size ranges (up to 0.5 , 0.6 to 1.0, 1.1 to 1.5, 1.6 to 2.0 and > 2.0 cm), total and average larvae per plant in different size ranges, percentage of plants without damage, with scratches and leaf holes on the whorl; percentage and mean number of parasitized larvae, number of emerged parasitoids and percentage of parasitism by the main parasitoids found. The results on percentage were compared among evaluation dates by t test between two proportions. For the other results t test for two independent samplings with Bootstrap resampling (10000 simulations). There was a greater number of egg masses in Bt Herculex® and Bt YieldGard® genotypes, in early and late sowing dates, respectively, with a predominance of up to 0.5 cm size larvae, especially in Bt genotypes, and higher larvae mortality by Bt Herculex® than Bt YieldGard®. Undamaged plants in the whorl predominate in Bt Herculex® area, in both sowing seasons, and the low incidence of whorl leaf wholes was predominant in both Bt genotypes in both sowing seasons. The predominance among larval parasiotids was of Campoletis flavicincta (Ashmead, 1890) (Hymenoptera: Ichneumonidae) and Chelonus insularis Cresson, 1865 (Hymenoptera: Braconidae), in early and late sowing seasons, respectively. Parasitized larvae occurred more frequently in late sowing season, for the three genotypes with higher parasitism in non-Bt maize and Bt YieldGard® in early and late seasons, respectively. The low amount of parasitoids found in Bt Herculex® was associated with the low larvae survivorship. |
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2017-05-162017-05-162012-02-16STURZA, Vinícius Soares. Population, damages and larval parasitoids of spodoptera frugiperda (j. e smith) (lepidoptera: noctuidae) in bt and non-bt maize. 2012. 83 f. Dissertação (Mestrado em Agronomia) - Universidade Federal de Santa Maria, Santa Maria, 2012.http://repositorio.ufsm.br/handle/1/5050The occurrence of Spodoptera frugiperda (J. E. Smith) (Lepidoptera: Noctuidae), the Fall armyworm, has led to increased adoption of Bt maize genotypes in Brazil. However, the field impacts on parasitoids of using these genotypes, especially those associated with the larval stage of this insect pest, are little known. The aim of this study was to evaluate two different Bt maize genotypes and its isoline (non-Bt) on Fall armyworm larvae population, its damage to maize plants and its larval parasitoids in early and late cropping season (sowing dates). The experiments were conducted in areas of Universidade Federal de Santa Maria (UFSM), Santa Maria, Rio Grande do Sul State, which were grown three maize areas in both early an late sowing, with the treatments: control (non-Bt), YieldGard®, expressing the Bt toxin Cry1Ab and Herculex®, which expresses the Bt toxin Cry1F, all comercial hybrids 30F53 and isolines among them. The area of each treatment was divided into 20 points, 36 m2 each, composed by 12 rows of 6 m, where 4 plants per point were randomly sampled, totaling 80 sampled plants per treatment. In early and late season, 14 maize plant surveys were made and afterwards transferred to the laboratory and evaluated for: number of S. frugiperda egg masses, total and percentage of collected larvae, in different size ranges (up to 0.5 , 0.6 to 1.0, 1.1 to 1.5, 1.6 to 2.0 and > 2.0 cm), total and average larvae per plant in different size ranges, percentage of plants without damage, with scratches and leaf holes on the whorl; percentage and mean number of parasitized larvae, number of emerged parasitoids and percentage of parasitism by the main parasitoids found. The results on percentage were compared among evaluation dates by t test between two proportions. For the other results t test for two independent samplings with Bootstrap resampling (10000 simulations). There was a greater number of egg masses in Bt Herculex® and Bt YieldGard® genotypes, in early and late sowing dates, respectively, with a predominance of up to 0.5 cm size larvae, especially in Bt genotypes, and higher larvae mortality by Bt Herculex® than Bt YieldGard®. Undamaged plants in the whorl predominate in Bt Herculex® area, in both sowing seasons, and the low incidence of whorl leaf wholes was predominant in both Bt genotypes in both sowing seasons. The predominance among larval parasiotids was of Campoletis flavicincta (Ashmead, 1890) (Hymenoptera: Ichneumonidae) and Chelonus insularis Cresson, 1865 (Hymenoptera: Braconidae), in early and late sowing seasons, respectively. Parasitized larvae occurred more frequently in late sowing season, for the three genotypes with higher parasitism in non-Bt maize and Bt YieldGard® in early and late seasons, respectively. The low amount of parasitoids found in Bt Herculex® was associated with the low larvae survivorship.A ocorrência de Spodoptera frugiperda (J. E. Smith) (Lepidoptera: Noctuidae), a lagarta-do-cartucho, levou ao aumento da adoção de genótipos de milho Bt no Brasil. No entanto, são pouco conhecidos os impactos da utilização desses materiais sobre os parasitoides desse inseto-praga, em especial aqueles associados à fase larval. O objetivo deste trabalho foi avaliar dois genótipos de milho Bt e suas isolinhas (não-Bt) sobre populações de larvas de S. frugiperda, além dos danos e parasitoides larvais, em semeadura de safra (do cedo) e safrinha (do tarde). Os experimentos foram realizados em três áreas de milho, situadas em Santa Maria, Rio Grande do Sul, cultivadas em duas épocas (safra e safrinha), com os tratamentos: testemunha (não-Bt), Bt Yieldgard®, com expressão da toxina Cry1Ab, e Bt Herculex®, que expressa a toxina Cry1F, todos híbridos comerciais 30F53 e isolinhas entre si. A área de cada tratamento foi dividida em 20 parcelas, de 36 m2 cada, compostas de 12 linhas de 6 m de comprimento, em que foram amostradas, aleatoriamente, quatro plantas por parcela, totalizando 80 plantas amostradas por área em cada data de amostragem. Em cada época, safra e safrinha, foram realizadas 14 coletas de plantas de milho, sendo que essas foram transferidas para o laboratório e avaliadas quanto ao número de posturas de S. frugiperda encontradas em laboratório, número de larvas coletadas em diferentes faixas de comprimento (até 0,5; 0,6-1,0; 1,1-1,5; 1,6-2,0 e >2,0 cm), de plantas sem danos, com raspagens e com perfurações no cartucho de larvas parasitadas e de parasitoides emergidos. Os resultados percentuais foram comparados entre as datas de avaliação mediante o teste t entre duas proporções. Para os demais resultados foram realizados contrastes por data de avaliação utilizando o teste t para duas amostras independentes, com Reamostragem Bootstrap (10.000 simulações). Houve maior número de posturas nos genótipos Bt Herculex® e Yieldgard®, na safra e na safrinha, respectivamente, um predomínio de larvas com até 0,5 cm, especialmente nos genótipos Bt, e maior mortalidade das mesmas no Bt Herculex® do que no Bt Yieldgard®. As plantas sem danos no cartucho predominaram em área com Bt Herculex®, tanto na safra quanto na safrinha, e a baixa incidência de perfurações no cartucho predominou em ambos os genótipos Bt, nas duas épocas. O predomínio dentre os parasitoides foi de Campoletis flavicincta (Ashmead, 1890) (Hymenoptera: Ichneumonidae) e Chelonus insularis Cresson, 1865 (Hymenoptera: Braconidae), em cultivo de safra e safrinha, respectivamente. As larvas parasitadas ocorrem em maior número nos cultivos de safrinha, com maior parasitismo em milho não-Bt e Bt Yieldgard®, na safra e na safrinha, respectivamente. A menor quantidade de parasitoides encontrada no Bt Herculex® foi associada à baixa sobrevivência de larvas.Coordenação de Aperfeiçoamento de Pessoal de Nível Superiorapplication/pdfporUniversidade Federal de Santa MariaPrograma de Pós-Graduação em AgronomiaUFSMBRAgronomiaBacillus thuringiensisLagarta-do-cartuchoInimigos naturaisZea mays L.Bacillus thuringiensisFall armywormNatural enemiesZea mays L.CNPQ::CIENCIAS AGRARIAS::AGRONOMIAPopulação, danos e parasitoides larvais de spodoptera frugiperda (j. e smith) (lepidoptera: noctuidae) em milho bt e não-btPopulation, damages and larval parasitoids of spodoptera frugiperda (j. e smith) (lepidoptera: noctuidae) in bt and non-bt maizeinfo:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/masterThesisHeldwein, Arno Bernardohttp://buscatextual.cnpq.br/buscatextual/visualizacv.do?id=K4788078U3Garcia, Flávio Roberto Mellohttp://buscatextual.cnpq.br/buscatextual/visualizacv.do?id=K4790149P1Nava, Dori Edsonhttp://buscatextual.cnpq.br/buscatextual/visualizacv.do?id=K4703200T6http://buscatextual.cnpq.br/buscatextual/visualizacv.do?id=K4458854J7Sturza, Vinícius Soares5001000000094005003003005002075a668-626c-446c-8b01-37ca432bd67f6b09d697-8e69-4b98-b4f6-a7a0b826a56391806409-f617-4ddd-b532-f622d1f6f468ed86bc85-7ef8-4c55-a9ef-78012d3d7c68info:eu-repo/semantics/openAccessreponame:Manancial - Repositório Digital da UFSMinstname:Universidade Federal de Santa Maria (UFSM)instacron:UFSMORIGINALSTURZA, VINICIUS SOARES.pdfapplication/pdf4153416http://repositorio.ufsm.br/bitstream/1/5050/1/STURZA%2c%20VINICIUS%20SOARES.pdf8496c1c68fd2b33d2793588bdc9b950aMD51TEXTSTURZA, VINICIUS SOARES.pdf.txtSTURZA, VINICIUS SOARES.pdf.txtExtracted texttext/plain172737http://repositorio.ufsm.br/bitstream/1/5050/2/STURZA%2c%20VINICIUS%20SOARES.pdf.txtb040533e63c200162d79c451f42c792aMD52THUMBNAILSTURZA, VINICIUS SOARES.pdf.jpgSTURZA, VINICIUS SOARES.pdf.jpgIM Thumbnailimage/jpeg5107http://repositorio.ufsm.br/bitstream/1/5050/3/STURZA%2c%20VINICIUS%20SOARES.pdf.jpg2ab77231d82abaab78ffd5b2b5b29d91MD531/50502017-07-25 11:13:15.422oai:repositorio.ufsm.br:1/5050Repositório Institucionalhttp://repositorio.ufsm.br/PUBhttp://repositorio.ufsm.br/oai/requestopendoar:39132017-07-25T14:13:15Manancial - Repositório Digital da UFSM - Universidade Federal de Santa Maria (UFSM)false |
dc.title.por.fl_str_mv |
População, danos e parasitoides larvais de spodoptera frugiperda (j. e smith) (lepidoptera: noctuidae) em milho bt e não-bt |
dc.title.alternative.eng.fl_str_mv |
Population, damages and larval parasitoids of spodoptera frugiperda (j. e smith) (lepidoptera: noctuidae) in bt and non-bt maize |
title |
População, danos e parasitoides larvais de spodoptera frugiperda (j. e smith) (lepidoptera: noctuidae) em milho bt e não-bt |
spellingShingle |
População, danos e parasitoides larvais de spodoptera frugiperda (j. e smith) (lepidoptera: noctuidae) em milho bt e não-bt Sturza, Vinícius Soares Bacillus thuringiensis Lagarta-do-cartucho Inimigos naturais Zea mays L. Bacillus thuringiensis Fall armyworm Natural enemies Zea mays L. CNPQ::CIENCIAS AGRARIAS::AGRONOMIA |
title_short |
População, danos e parasitoides larvais de spodoptera frugiperda (j. e smith) (lepidoptera: noctuidae) em milho bt e não-bt |
title_full |
População, danos e parasitoides larvais de spodoptera frugiperda (j. e smith) (lepidoptera: noctuidae) em milho bt e não-bt |
title_fullStr |
População, danos e parasitoides larvais de spodoptera frugiperda (j. e smith) (lepidoptera: noctuidae) em milho bt e não-bt |
title_full_unstemmed |
População, danos e parasitoides larvais de spodoptera frugiperda (j. e smith) (lepidoptera: noctuidae) em milho bt e não-bt |
title_sort |
População, danos e parasitoides larvais de spodoptera frugiperda (j. e smith) (lepidoptera: noctuidae) em milho bt e não-bt |
author |
Sturza, Vinícius Soares |
author_facet |
Sturza, Vinícius Soares |
author_role |
author |
dc.contributor.advisor1.fl_str_mv |
Heldwein, Arno Bernardo |
dc.contributor.advisor1Lattes.fl_str_mv |
http://buscatextual.cnpq.br/buscatextual/visualizacv.do?id=K4788078U3 |
dc.contributor.referee1.fl_str_mv |
Garcia, Flávio Roberto Mello |
dc.contributor.referee1Lattes.fl_str_mv |
http://buscatextual.cnpq.br/buscatextual/visualizacv.do?id=K4790149P1 |
dc.contributor.referee2.fl_str_mv |
Nava, Dori Edson |
dc.contributor.referee2Lattes.fl_str_mv |
http://buscatextual.cnpq.br/buscatextual/visualizacv.do?id=K4703200T6 |
dc.contributor.authorLattes.fl_str_mv |
http://buscatextual.cnpq.br/buscatextual/visualizacv.do?id=K4458854J7 |
dc.contributor.author.fl_str_mv |
Sturza, Vinícius Soares |
contributor_str_mv |
Heldwein, Arno Bernardo Garcia, Flávio Roberto Mello Nava, Dori Edson |
dc.subject.por.fl_str_mv |
Bacillus thuringiensis Lagarta-do-cartucho Inimigos naturais Zea mays L. |
topic |
Bacillus thuringiensis Lagarta-do-cartucho Inimigos naturais Zea mays L. Bacillus thuringiensis Fall armyworm Natural enemies Zea mays L. CNPQ::CIENCIAS AGRARIAS::AGRONOMIA |
dc.subject.eng.fl_str_mv |
Bacillus thuringiensis Fall armyworm Natural enemies Zea mays L. |
dc.subject.cnpq.fl_str_mv |
CNPQ::CIENCIAS AGRARIAS::AGRONOMIA |
description |
The occurrence of Spodoptera frugiperda (J. E. Smith) (Lepidoptera: Noctuidae), the Fall armyworm, has led to increased adoption of Bt maize genotypes in Brazil. However, the field impacts on parasitoids of using these genotypes, especially those associated with the larval stage of this insect pest, are little known. The aim of this study was to evaluate two different Bt maize genotypes and its isoline (non-Bt) on Fall armyworm larvae population, its damage to maize plants and its larval parasitoids in early and late cropping season (sowing dates). The experiments were conducted in areas of Universidade Federal de Santa Maria (UFSM), Santa Maria, Rio Grande do Sul State, which were grown three maize areas in both early an late sowing, with the treatments: control (non-Bt), YieldGard®, expressing the Bt toxin Cry1Ab and Herculex®, which expresses the Bt toxin Cry1F, all comercial hybrids 30F53 and isolines among them. The area of each treatment was divided into 20 points, 36 m2 each, composed by 12 rows of 6 m, where 4 plants per point were randomly sampled, totaling 80 sampled plants per treatment. In early and late season, 14 maize plant surveys were made and afterwards transferred to the laboratory and evaluated for: number of S. frugiperda egg masses, total and percentage of collected larvae, in different size ranges (up to 0.5 , 0.6 to 1.0, 1.1 to 1.5, 1.6 to 2.0 and > 2.0 cm), total and average larvae per plant in different size ranges, percentage of plants without damage, with scratches and leaf holes on the whorl; percentage and mean number of parasitized larvae, number of emerged parasitoids and percentage of parasitism by the main parasitoids found. The results on percentage were compared among evaluation dates by t test between two proportions. For the other results t test for two independent samplings with Bootstrap resampling (10000 simulations). There was a greater number of egg masses in Bt Herculex® and Bt YieldGard® genotypes, in early and late sowing dates, respectively, with a predominance of up to 0.5 cm size larvae, especially in Bt genotypes, and higher larvae mortality by Bt Herculex® than Bt YieldGard®. Undamaged plants in the whorl predominate in Bt Herculex® area, in both sowing seasons, and the low incidence of whorl leaf wholes was predominant in both Bt genotypes in both sowing seasons. The predominance among larval parasiotids was of Campoletis flavicincta (Ashmead, 1890) (Hymenoptera: Ichneumonidae) and Chelonus insularis Cresson, 1865 (Hymenoptera: Braconidae), in early and late sowing seasons, respectively. Parasitized larvae occurred more frequently in late sowing season, for the three genotypes with higher parasitism in non-Bt maize and Bt YieldGard® in early and late seasons, respectively. The low amount of parasitoids found in Bt Herculex® was associated with the low larvae survivorship. |
publishDate |
2012 |
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2012-02-16 |
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2017-05-16 |
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2017-05-16 |
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info:eu-repo/semantics/masterThesis |
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STURZA, Vinícius Soares. Population, damages and larval parasitoids of spodoptera frugiperda (j. e smith) (lepidoptera: noctuidae) in bt and non-bt maize. 2012. 83 f. Dissertação (Mestrado em Agronomia) - Universidade Federal de Santa Maria, Santa Maria, 2012. |
dc.identifier.uri.fl_str_mv |
http://repositorio.ufsm.br/handle/1/5050 |
identifier_str_mv |
STURZA, Vinícius Soares. Population, damages and larval parasitoids of spodoptera frugiperda (j. e smith) (lepidoptera: noctuidae) in bt and non-bt maize. 2012. 83 f. Dissertação (Mestrado em Agronomia) - Universidade Federal de Santa Maria, Santa Maria, 2012. |
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Universidade Federal de Santa Maria |
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