Lethal and sublethal effects of neem on Aphis gossypii and Cycloneda sanguinea in watermelon
Autor(a) principal: | |
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Data de Publicação: | 2015 |
Outros Autores: | , , , , |
Tipo de documento: | Artigo |
Idioma: | eng |
Título da fonte: | Acta Scientiarum. Agronomy (Online) |
Texto Completo: | http://www.periodicos.uem.br/ojs/index.php/ActaSciAgron/article/view/19517 |
Resumo: | The objective of this study was to evaluate the impact of oil extract of neem, Azadirachta indica, on the watermelon aphid Aphis gossypii and its natural enemy Cycloneda sanguinea. Toxicity bioassays were conducted with the commercial product DalNeem (1,475 g L-1 azadirachtin) at 0.0037 µg a.i. mL-1, 0.0074 µg a.i. mL-1 and 0.0148 µg a.i. mL-1, Malathion at 1 µg a.i. mL-1 and distilled water as a control treatment. The products were sprayed to watermelon leaf discs, and the insects were exposed to the product residues. The instantaneous population growth rate of A. gossypii and the survival of C. sanguinea larvae exposed to the different treatments were calculated. A decrease in the instantaneous population growth rate of A. gossypii with increasing concentrations of neem was observed, and the aphids did not reproduce on the leaf discs treated with malathion during the first 24 hours of exposure due to its rapid lethal effect on adult insects. The larvae of the predator C. sanguinea exposed to malathion survived only for 24 hours. The survival of the predator exposed to different concentrations of neem was also significantly reduced compared to the predators exposed only to water. However, laboratory experiments may overestimate the effect of neem on predators because the individuals cannot employ escape behavior caused by neem repellency. |
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Acta Scientiarum. Agronomy (Online) |
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Lethal and sublethal effects of neem on Aphis gossypii and Cycloneda sanguinea in watermelonCitrullus lanatusAzadirachta indicaCoccinellidaeAphididaeEntomologiaThe objective of this study was to evaluate the impact of oil extract of neem, Azadirachta indica, on the watermelon aphid Aphis gossypii and its natural enemy Cycloneda sanguinea. Toxicity bioassays were conducted with the commercial product DalNeem (1,475 g L-1 azadirachtin) at 0.0037 µg a.i. mL-1, 0.0074 µg a.i. mL-1 and 0.0148 µg a.i. mL-1, Malathion at 1 µg a.i. mL-1 and distilled water as a control treatment. The products were sprayed to watermelon leaf discs, and the insects were exposed to the product residues. The instantaneous population growth rate of A. gossypii and the survival of C. sanguinea larvae exposed to the different treatments were calculated. A decrease in the instantaneous population growth rate of A. gossypii with increasing concentrations of neem was observed, and the aphids did not reproduce on the leaf discs treated with malathion during the first 24 hours of exposure due to its rapid lethal effect on adult insects. The larvae of the predator C. sanguinea exposed to malathion survived only for 24 hours. The survival of the predator exposed to different concentrations of neem was also significantly reduced compared to the predators exposed only to water. However, laboratory experiments may overestimate the effect of neem on predators because the individuals cannot employ escape behavior caused by neem repellency. Universidade Estadual de Maringá2015-05-04info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersionapplication/pdfhttp://www.periodicos.uem.br/ojs/index.php/ActaSciAgron/article/view/1951710.4025/actasciagron.v37i2.19517Acta Scientiarum. Agronomy; Vol 37 No 2 (2015); 233-239Acta Scientiarum. Agronomy; v. 37 n. 2 (2015); 233-2391807-86211679-9275reponame:Acta Scientiarum. Agronomy (Online)instname:Universidade Estadual de Maringá (UEM)instacron:UEMenghttp://www.periodicos.uem.br/ojs/index.php/ActaSciAgron/article/view/19517/pdf_72Souza, Cíntia RibeiroSarmento, Renato AlmeidaVenzon, Madelainedos Santos, Gil RodriguesSilveira, Marcela Cristina Agustini C. daTschoeke, Paulo Henriqueinfo:eu-repo/semantics/openAccess2015-06-03T09:37:36Zoai:periodicos.uem.br/ojs:article/19517Revistahttp://www.periodicos.uem.br/ojs/index.php/ActaSciAgronPUBhttp://www.periodicos.uem.br/ojs/index.php/ActaSciAgron/oaiactaagron@uem.br||actaagron@uem.br|| edamasio@uem.br1807-86211679-9275opendoar:2015-06-03T09:37:36Acta Scientiarum. Agronomy (Online) - Universidade Estadual de Maringá (UEM)false |
dc.title.none.fl_str_mv |
Lethal and sublethal effects of neem on Aphis gossypii and Cycloneda sanguinea in watermelon |
title |
Lethal and sublethal effects of neem on Aphis gossypii and Cycloneda sanguinea in watermelon |
spellingShingle |
Lethal and sublethal effects of neem on Aphis gossypii and Cycloneda sanguinea in watermelon Souza, Cíntia Ribeiro Citrullus lanatus Azadirachta indica Coccinellidae Aphididae Entomologia |
title_short |
Lethal and sublethal effects of neem on Aphis gossypii and Cycloneda sanguinea in watermelon |
title_full |
Lethal and sublethal effects of neem on Aphis gossypii and Cycloneda sanguinea in watermelon |
title_fullStr |
Lethal and sublethal effects of neem on Aphis gossypii and Cycloneda sanguinea in watermelon |
title_full_unstemmed |
Lethal and sublethal effects of neem on Aphis gossypii and Cycloneda sanguinea in watermelon |
title_sort |
Lethal and sublethal effects of neem on Aphis gossypii and Cycloneda sanguinea in watermelon |
author |
Souza, Cíntia Ribeiro |
author_facet |
Souza, Cíntia Ribeiro Sarmento, Renato Almeida Venzon, Madelaine dos Santos, Gil Rodrigues Silveira, Marcela Cristina Agustini C. da Tschoeke, Paulo Henrique |
author_role |
author |
author2 |
Sarmento, Renato Almeida Venzon, Madelaine dos Santos, Gil Rodrigues Silveira, Marcela Cristina Agustini C. da Tschoeke, Paulo Henrique |
author2_role |
author author author author author |
dc.contributor.author.fl_str_mv |
Souza, Cíntia Ribeiro Sarmento, Renato Almeida Venzon, Madelaine dos Santos, Gil Rodrigues Silveira, Marcela Cristina Agustini C. da Tschoeke, Paulo Henrique |
dc.subject.por.fl_str_mv |
Citrullus lanatus Azadirachta indica Coccinellidae Aphididae Entomologia |
topic |
Citrullus lanatus Azadirachta indica Coccinellidae Aphididae Entomologia |
description |
The objective of this study was to evaluate the impact of oil extract of neem, Azadirachta indica, on the watermelon aphid Aphis gossypii and its natural enemy Cycloneda sanguinea. Toxicity bioassays were conducted with the commercial product DalNeem (1,475 g L-1 azadirachtin) at 0.0037 µg a.i. mL-1, 0.0074 µg a.i. mL-1 and 0.0148 µg a.i. mL-1, Malathion at 1 µg a.i. mL-1 and distilled water as a control treatment. The products were sprayed to watermelon leaf discs, and the insects were exposed to the product residues. The instantaneous population growth rate of A. gossypii and the survival of C. sanguinea larvae exposed to the different treatments were calculated. A decrease in the instantaneous population growth rate of A. gossypii with increasing concentrations of neem was observed, and the aphids did not reproduce on the leaf discs treated with malathion during the first 24 hours of exposure due to its rapid lethal effect on adult insects. The larvae of the predator C. sanguinea exposed to malathion survived only for 24 hours. The survival of the predator exposed to different concentrations of neem was also significantly reduced compared to the predators exposed only to water. However, laboratory experiments may overestimate the effect of neem on predators because the individuals cannot employ escape behavior caused by neem repellency. |
publishDate |
2015 |
dc.date.none.fl_str_mv |
2015-05-04 |
dc.type.driver.fl_str_mv |
info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion |
format |
article |
status_str |
publishedVersion |
dc.identifier.uri.fl_str_mv |
http://www.periodicos.uem.br/ojs/index.php/ActaSciAgron/article/view/19517 10.4025/actasciagron.v37i2.19517 |
url |
http://www.periodicos.uem.br/ojs/index.php/ActaSciAgron/article/view/19517 |
identifier_str_mv |
10.4025/actasciagron.v37i2.19517 |
dc.language.iso.fl_str_mv |
eng |
language |
eng |
dc.relation.none.fl_str_mv |
http://www.periodicos.uem.br/ojs/index.php/ActaSciAgron/article/view/19517/pdf_72 |
dc.rights.driver.fl_str_mv |
info:eu-repo/semantics/openAccess |
eu_rights_str_mv |
openAccess |
dc.format.none.fl_str_mv |
application/pdf |
dc.publisher.none.fl_str_mv |
Universidade Estadual de Maringá |
publisher.none.fl_str_mv |
Universidade Estadual de Maringá |
dc.source.none.fl_str_mv |
Acta Scientiarum. Agronomy; Vol 37 No 2 (2015); 233-239 Acta Scientiarum. Agronomy; v. 37 n. 2 (2015); 233-239 1807-8621 1679-9275 reponame:Acta Scientiarum. Agronomy (Online) instname:Universidade Estadual de Maringá (UEM) instacron:UEM |
instname_str |
Universidade Estadual de Maringá (UEM) |
instacron_str |
UEM |
institution |
UEM |
reponame_str |
Acta Scientiarum. Agronomy (Online) |
collection |
Acta Scientiarum. Agronomy (Online) |
repository.name.fl_str_mv |
Acta Scientiarum. Agronomy (Online) - Universidade Estadual de Maringá (UEM) |
repository.mail.fl_str_mv |
actaagron@uem.br||actaagron@uem.br|| edamasio@uem.br |
_version_ |
1799305909324742656 |