Trichogramma pretiosum in field release and under different temperatures in laboratory

Detalhes bibliográficos
Autor(a) principal: Morais,Rosana Matos de
Data de Publicação: 2020
Outros Autores: Moro,Tamires Silveira, Saldanha,Cleber Witt, Steffen,Gerusa Pauli Kist, Missio,Evandro Luiz, Maldaner,Joseila, Steffen,Ricardo Bemfica
Tipo de documento: Artigo
Idioma: eng
Título da fonte: Arquivos do instituto biológico (Online)
Texto Completo: http://old.scielo.br/scielo.php?script=sci_arttext&pid=S1808-16572020000100226
Resumo: ABSTRACT This study aimed to evaluate a strain of Trichogramma pretiosum native to the central region of the state Rio Grande do Sul, Brazil, under different temperatures in laboratory and the parasitism of Helicoverpa zea after releases in corn field. Trichogramma pretiosum females were kept at 18, 25 and 30 °C and had their parasitism potential evaluated. Nine plots (400 m2) of maize were installed in randomized blocks under the treatments: 1) staggered release of parasitoids in three different occasions, at three-day intervals; 2) a single release of parasitoids; 3) no release of parasitoids. Ears were collected every four days and the number of caterpillars and eggs of H. zea in the maize silk and the number of damaged ears were estimated. Evaluation started after the tassels growth and ended with the drying of the styles-stigmas. To estimate the grain mass and the ear number and mass, two lines in each plot were delimited and reserved at the end of the cultivation cycle. In laboratory, the highest parasitism rate occurred at 25 °C (35.54%) and the lowest longevity at 30 °C (6.8 days). A total of 1,063 H. zea eggs were collected in the field, 69.52% were parasitized. The mean parasitism rate was higher in T1 (staggered release, 82.77%) than in control (51.87%), but there was no difference in grain yield. Based on the parasitism capacity of the studied strain, it can be potentially used in programs of biological control of H. zea in corn crops of Rio Grande do Sul.
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spelling Trichogramma pretiosum in field release and under different temperatures in laboratoryHelicoverpa zeastraincornparasitismABSTRACT This study aimed to evaluate a strain of Trichogramma pretiosum native to the central region of the state Rio Grande do Sul, Brazil, under different temperatures in laboratory and the parasitism of Helicoverpa zea after releases in corn field. Trichogramma pretiosum females were kept at 18, 25 and 30 °C and had their parasitism potential evaluated. Nine plots (400 m2) of maize were installed in randomized blocks under the treatments: 1) staggered release of parasitoids in three different occasions, at three-day intervals; 2) a single release of parasitoids; 3) no release of parasitoids. Ears were collected every four days and the number of caterpillars and eggs of H. zea in the maize silk and the number of damaged ears were estimated. Evaluation started after the tassels growth and ended with the drying of the styles-stigmas. To estimate the grain mass and the ear number and mass, two lines in each plot were delimited and reserved at the end of the cultivation cycle. In laboratory, the highest parasitism rate occurred at 25 °C (35.54%) and the lowest longevity at 30 °C (6.8 days). A total of 1,063 H. zea eggs were collected in the field, 69.52% were parasitized. The mean parasitism rate was higher in T1 (staggered release, 82.77%) than in control (51.87%), but there was no difference in grain yield. Based on the parasitism capacity of the studied strain, it can be potentially used in programs of biological control of H. zea in corn crops of Rio Grande do Sul.Instituto Biológico2020-01-01info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersiontext/htmlhttp://old.scielo.br/scielo.php?script=sci_arttext&pid=S1808-16572020000100226Arquivos do Instituto Biológico v.87 2020reponame:Arquivos do instituto biológico (Online)instname:Instituto Biológico (IB)instacron:IBIO10.1590/1808-1657001152018info:eu-repo/semantics/openAccessMorais,Rosana Matos deMoro,Tamires SilveiraSaldanha,Cleber WittSteffen,Gerusa Pauli KistMissio,Evandro LuizMaldaner,JoseilaSteffen,Ricardo Bemficaeng2020-10-28T00:00:00Zoai:scielo:S1808-16572020000100226Revistahttp://www.biologico.sp.gov.br/arquivos_bio.phphttps://old.scielo.br/oai/scielo-oai.php||arquivos@biologico.sp.gov.br1808-16570020-3653opendoar:2020-10-28T00:00Arquivos do instituto biológico (Online) - Instituto Biológico (IB)false
dc.title.none.fl_str_mv Trichogramma pretiosum in field release and under different temperatures in laboratory
title Trichogramma pretiosum in field release and under different temperatures in laboratory
spellingShingle Trichogramma pretiosum in field release and under different temperatures in laboratory
Morais,Rosana Matos de
Helicoverpa zea
strain
corn
parasitism
title_short Trichogramma pretiosum in field release and under different temperatures in laboratory
title_full Trichogramma pretiosum in field release and under different temperatures in laboratory
title_fullStr Trichogramma pretiosum in field release and under different temperatures in laboratory
title_full_unstemmed Trichogramma pretiosum in field release and under different temperatures in laboratory
title_sort Trichogramma pretiosum in field release and under different temperatures in laboratory
author Morais,Rosana Matos de
author_facet Morais,Rosana Matos de
Moro,Tamires Silveira
Saldanha,Cleber Witt
Steffen,Gerusa Pauli Kist
Missio,Evandro Luiz
Maldaner,Joseila
Steffen,Ricardo Bemfica
author_role author
author2 Moro,Tamires Silveira
Saldanha,Cleber Witt
Steffen,Gerusa Pauli Kist
Missio,Evandro Luiz
Maldaner,Joseila
Steffen,Ricardo Bemfica
author2_role author
author
author
author
author
author
dc.contributor.author.fl_str_mv Morais,Rosana Matos de
Moro,Tamires Silveira
Saldanha,Cleber Witt
Steffen,Gerusa Pauli Kist
Missio,Evandro Luiz
Maldaner,Joseila
Steffen,Ricardo Bemfica
dc.subject.por.fl_str_mv Helicoverpa zea
strain
corn
parasitism
topic Helicoverpa zea
strain
corn
parasitism
description ABSTRACT This study aimed to evaluate a strain of Trichogramma pretiosum native to the central region of the state Rio Grande do Sul, Brazil, under different temperatures in laboratory and the parasitism of Helicoverpa zea after releases in corn field. Trichogramma pretiosum females were kept at 18, 25 and 30 °C and had their parasitism potential evaluated. Nine plots (400 m2) of maize were installed in randomized blocks under the treatments: 1) staggered release of parasitoids in three different occasions, at three-day intervals; 2) a single release of parasitoids; 3) no release of parasitoids. Ears were collected every four days and the number of caterpillars and eggs of H. zea in the maize silk and the number of damaged ears were estimated. Evaluation started after the tassels growth and ended with the drying of the styles-stigmas. To estimate the grain mass and the ear number and mass, two lines in each plot were delimited and reserved at the end of the cultivation cycle. In laboratory, the highest parasitism rate occurred at 25 °C (35.54%) and the lowest longevity at 30 °C (6.8 days). A total of 1,063 H. zea eggs were collected in the field, 69.52% were parasitized. The mean parasitism rate was higher in T1 (staggered release, 82.77%) than in control (51.87%), but there was no difference in grain yield. Based on the parasitism capacity of the studied strain, it can be potentially used in programs of biological control of H. zea in corn crops of Rio Grande do Sul.
publishDate 2020
dc.date.none.fl_str_mv 2020-01-01
dc.type.driver.fl_str_mv info:eu-repo/semantics/article
dc.type.status.fl_str_mv info:eu-repo/semantics/publishedVersion
format article
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dc.identifier.uri.fl_str_mv http://old.scielo.br/scielo.php?script=sci_arttext&pid=S1808-16572020000100226
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dc.language.iso.fl_str_mv eng
language eng
dc.relation.none.fl_str_mv 10.1590/1808-1657001152018
dc.rights.driver.fl_str_mv info:eu-repo/semantics/openAccess
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dc.format.none.fl_str_mv text/html
dc.publisher.none.fl_str_mv Instituto Biológico
publisher.none.fl_str_mv Instituto Biológico
dc.source.none.fl_str_mv Arquivos do Instituto Biológico v.87 2020
reponame:Arquivos do instituto biológico (Online)
instname:Instituto Biológico (IB)
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reponame_str Arquivos do instituto biológico (Online)
collection Arquivos do instituto biológico (Online)
repository.name.fl_str_mv Arquivos do instituto biológico (Online) - Instituto Biológico (IB)
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