The impact of fungicides on Nomuraea rileyi(farlow) Samson epizootics and on populations of Anticarsia gemmatalis Hübner (Lepidoptera: noctuidae), on soybean.

Detalhes bibliográficos
Autor(a) principal: SOSA-GOMEZ, D. R.
Data de Publicação: 2003
Outros Autores: DELPIN, K. E., MOSCARDI, F., NOZAKI, M. de H.
Tipo de documento: Artigo
Idioma: eng
Título da fonte: Repositório Institucional da EMBRAPA (Repository Open Access to Scientific Information from EMBRAPA - Alice)
Texto Completo: http://www.alice.cnptia.embrapa.br/alice/handle/doc/952789
http://dx.doi.org/10.1590/S1519-566X2003000200014.
Resumo: The fungus Nomuraea rileyi (Farlow) Samson is one of the most important natural enemies of soybean caterpillars, mainly under humid weather conditions. Outbreaks of the fungus Microsphaera diffusa Cooke & Peck have demanded fungicide applications on soybeans, which could result in outbreaks of noctuid populations by reduction of the natural inocula of N. rileyi. The recommended fungicides have shown to be detrimental to beneficial fungi, reducing infection, delaying epizootics, and resulting in increased host population densities. In laboratory assays, benomyl, difenoconazole, sulphur and carbendazim affected conidial germination of N. rileyi, being the latter less deleterious. To assess the impact of fungicides used to control M. diffusa, on N. rileyi, two tests were carried on, spraying difenoconazole (75 g a.i./ha) and benomyl (262.5 g a.i./ha) on soybean plots. In the 1997/98 trial, fungicide was sprayed once on soybean plants at R1-R2 developmental stages. In the 1998/99 test, two applications were made, when plants were at V5 and V7 developmental stages, respectively. The number of VBC larvae was significantly higher in the fungicide treated plots than in the control plots. In the 1997/98 test, benomyl treated plots resulted in higher populations of VBC than in the control or in the difenoconazole plots. In the 1998/99 test, VBC population was higher from 7 to 12 days after the first application, and remained high until 19 days after the second application. In general, fungicide treatments delayed the begining of N. rileyi epizootics from 2 to 14 days.
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spelling The impact of fungicides on Nomuraea rileyi(farlow) Samson epizootics and on populations of Anticarsia gemmatalis Hübner (Lepidoptera: noctuidae), on soybean.SojaThe fungus Nomuraea rileyi (Farlow) Samson is one of the most important natural enemies of soybean caterpillars, mainly under humid weather conditions. Outbreaks of the fungus Microsphaera diffusa Cooke & Peck have demanded fungicide applications on soybeans, which could result in outbreaks of noctuid populations by reduction of the natural inocula of N. rileyi. The recommended fungicides have shown to be detrimental to beneficial fungi, reducing infection, delaying epizootics, and resulting in increased host population densities. In laboratory assays, benomyl, difenoconazole, sulphur and carbendazim affected conidial germination of N. rileyi, being the latter less deleterious. To assess the impact of fungicides used to control M. diffusa, on N. rileyi, two tests were carried on, spraying difenoconazole (75 g a.i./ha) and benomyl (262.5 g a.i./ha) on soybean plots. In the 1997/98 trial, fungicide was sprayed once on soybean plants at R1-R2 developmental stages. In the 1998/99 test, two applications were made, when plants were at V5 and V7 developmental stages, respectively. The number of VBC larvae was significantly higher in the fungicide treated plots than in the control plots. In the 1997/98 test, benomyl treated plots resulted in higher populations of VBC than in the control or in the difenoconazole plots. In the 1998/99 test, VBC population was higher from 7 to 12 days after the first application, and remained high until 19 days after the second application. In general, fungicide treatments delayed the begining of N. rileyi epizootics from 2 to 14 days.DANIEL RICARDO SOSA GOMEZ, CNPSO; KATIAÍRES E. DELPIN; FLÁVIO MOSCARDI; MARCIA DE H. NOZAKI.SOSA-GOMEZ, D. R.DELPIN, K. E.MOSCARDI, F.NOZAKI, M. de H.2013-03-12T11:11:11Z2013-03-12T11:11:11Z2013-03-1220032013-03-22T11:11:11Zinfo:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/articleNeotropical Entomology, v. 32, n. 2, p. 287-291, Apr.-Jun. 2003.1519-566X.http://www.alice.cnptia.embrapa.br/alice/handle/doc/952789http://dx.doi.org/10.1590/S1519-566X2003000200014.enginfo:eu-repo/semantics/openAccessreponame:Repositório Institucional da EMBRAPA (Repository Open Access to Scientific Information from EMBRAPA - Alice)instname:Empresa Brasileira de Pesquisa Agropecuária (Embrapa)instacron:EMBRAPA2017-08-15T22:58:27Zoai:www.alice.cnptia.embrapa.br:doc/952789Repositório InstitucionalPUBhttps://www.alice.cnptia.embrapa.br/oai/requestcg-riaa@embrapa.bropendoar:21542017-08-15T22:58:27Repositório Institucional da EMBRAPA (Repository Open Access to Scientific Information from EMBRAPA - Alice) - Empresa Brasileira de Pesquisa Agropecuária (Embrapa)false
dc.title.none.fl_str_mv The impact of fungicides on Nomuraea rileyi(farlow) Samson epizootics and on populations of Anticarsia gemmatalis Hübner (Lepidoptera: noctuidae), on soybean.
title The impact of fungicides on Nomuraea rileyi(farlow) Samson epizootics and on populations of Anticarsia gemmatalis Hübner (Lepidoptera: noctuidae), on soybean.
spellingShingle The impact of fungicides on Nomuraea rileyi(farlow) Samson epizootics and on populations of Anticarsia gemmatalis Hübner (Lepidoptera: noctuidae), on soybean.
SOSA-GOMEZ, D. R.
Soja
title_short The impact of fungicides on Nomuraea rileyi(farlow) Samson epizootics and on populations of Anticarsia gemmatalis Hübner (Lepidoptera: noctuidae), on soybean.
title_full The impact of fungicides on Nomuraea rileyi(farlow) Samson epizootics and on populations of Anticarsia gemmatalis Hübner (Lepidoptera: noctuidae), on soybean.
title_fullStr The impact of fungicides on Nomuraea rileyi(farlow) Samson epizootics and on populations of Anticarsia gemmatalis Hübner (Lepidoptera: noctuidae), on soybean.
title_full_unstemmed The impact of fungicides on Nomuraea rileyi(farlow) Samson epizootics and on populations of Anticarsia gemmatalis Hübner (Lepidoptera: noctuidae), on soybean.
title_sort The impact of fungicides on Nomuraea rileyi(farlow) Samson epizootics and on populations of Anticarsia gemmatalis Hübner (Lepidoptera: noctuidae), on soybean.
author SOSA-GOMEZ, D. R.
author_facet SOSA-GOMEZ, D. R.
DELPIN, K. E.
MOSCARDI, F.
NOZAKI, M. de H.
author_role author
author2 DELPIN, K. E.
MOSCARDI, F.
NOZAKI, M. de H.
author2_role author
author
author
dc.contributor.none.fl_str_mv DANIEL RICARDO SOSA GOMEZ, CNPSO; KATIAÍRES E. DELPIN; FLÁVIO MOSCARDI; MARCIA DE H. NOZAKI.
dc.contributor.author.fl_str_mv SOSA-GOMEZ, D. R.
DELPIN, K. E.
MOSCARDI, F.
NOZAKI, M. de H.
dc.subject.por.fl_str_mv Soja
topic Soja
description The fungus Nomuraea rileyi (Farlow) Samson is one of the most important natural enemies of soybean caterpillars, mainly under humid weather conditions. Outbreaks of the fungus Microsphaera diffusa Cooke & Peck have demanded fungicide applications on soybeans, which could result in outbreaks of noctuid populations by reduction of the natural inocula of N. rileyi. The recommended fungicides have shown to be detrimental to beneficial fungi, reducing infection, delaying epizootics, and resulting in increased host population densities. In laboratory assays, benomyl, difenoconazole, sulphur and carbendazim affected conidial germination of N. rileyi, being the latter less deleterious. To assess the impact of fungicides used to control M. diffusa, on N. rileyi, two tests were carried on, spraying difenoconazole (75 g a.i./ha) and benomyl (262.5 g a.i./ha) on soybean plots. In the 1997/98 trial, fungicide was sprayed once on soybean plants at R1-R2 developmental stages. In the 1998/99 test, two applications were made, when plants were at V5 and V7 developmental stages, respectively. The number of VBC larvae was significantly higher in the fungicide treated plots than in the control plots. In the 1997/98 test, benomyl treated plots resulted in higher populations of VBC than in the control or in the difenoconazole plots. In the 1998/99 test, VBC population was higher from 7 to 12 days after the first application, and remained high until 19 days after the second application. In general, fungicide treatments delayed the begining of N. rileyi epizootics from 2 to 14 days.
publishDate 2003
dc.date.none.fl_str_mv 2003
2013-03-12T11:11:11Z
2013-03-12T11:11:11Z
2013-03-12
2013-03-22T11:11:11Z
dc.type.status.fl_str_mv info:eu-repo/semantics/publishedVersion
dc.type.driver.fl_str_mv info:eu-repo/semantics/article
format article
status_str publishedVersion
dc.identifier.uri.fl_str_mv Neotropical Entomology, v. 32, n. 2, p. 287-291, Apr.-Jun. 2003.
1519-566X.
http://www.alice.cnptia.embrapa.br/alice/handle/doc/952789
http://dx.doi.org/10.1590/S1519-566X2003000200014.
identifier_str_mv Neotropical Entomology, v. 32, n. 2, p. 287-291, Apr.-Jun. 2003.
1519-566X.
url http://www.alice.cnptia.embrapa.br/alice/handle/doc/952789
http://dx.doi.org/10.1590/S1519-566X2003000200014.
dc.language.iso.fl_str_mv eng
language eng
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instname_str Empresa Brasileira de Pesquisa Agropecuária (Embrapa)
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repository.mail.fl_str_mv cg-riaa@embrapa.br
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