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 | Acesso ao texto completo restrito à biblioteca da Embrapa Milho e Sorgo. Para informações adicionais entre em contato com cnpms.biblioteca@embrapa.br. |
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Registro Completo |
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Biblioteca(s): |
Embrapa Milho e Sorgo. |
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Data corrente: |
11/09/2023 |
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Data da última atualização: |
10/11/2023 |
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Tipo da produção científica: |
Artigo em Periódico Indexado |
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Autoria: |
OLIVEIRA, C. M. de; SABATO, E. de O.; BARROS, B. de A. |
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Afiliação: |
CHARLES MARTINS DE OLIVEIRA, CPAC; ELIZABETH DE OLIVEIRA SABATO, PESQUISADORA APOSENTADA-CNPMS; BEATRIZ DE ALMEIDA BARROS, CNPMS. |
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Título: |
Natural infectivity of Dalbulus maidis populations and incidence of corn stunt and virus diseases in maize over time. |
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Ano de publicação: |
2023 |
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Fonte/Imprenta: |
Tropical Plant Pathology, v. 48, p. 575-580, 2023. |
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DOI: |
https://doi.org/10.1007/s40858-023-00599-0 |
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Idioma: |
Inglês |
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Conteúdo: |
The aim of this study was to evaluate the natural infectivity of Dalbulus maidis with spiroplasma (corn stunt spiroplasma'CSS'Spiroplasma kunkelii), phytoplasma (maize bushy stunt phytoplasma'MBSP), and virus (maize rayado fino virus'MRFV) through transmission tests using two densities of leafhoppers (one and five adult D. maidis) collected fortnightly from maize fields during two agricultural years. During 35 months D. maidis adults were collected in maize at intervals of 15 days with entomological net (Sete Lagoas/MG, Brazil). The leafhoppers were confined in number of one or five individuals by maize plant (V2 stage) for an inoculation access period (IAP) of five days. At flowering stage, plant disease symptoms were evaluated. The total percentage of plants showing symptoms of infection by at least one of the pathogens (spiroplasma, phytoplasma or MRFV) was significantly higher for plants that were exposed to five leafhoppers (24.2%) compared to those exposed to one leafhopper (12.3%). The percent of diseased plants was similar in Autumn (20.0%), Winter (18.8%), Springer (16.1%) and Summer (18.3%). However, spiroplasma infection was predominant in Summer. Our results demonstrated that a five-fold increase in the number of D. maidis on maize plants led to a two-fold increase in the number of symptomatic plants. Under natural conditions, leafhoppers have the ability to visit multiple plants during the post-emergence phase, thereby transmitting pathogens to multiple plants that become source plants for corn stunt and virus diseases. Therefore, population reduction of D. maidis can be a critical strategy for managing these diseases in maize crops. MenosThe aim of this study was to evaluate the natural infectivity of Dalbulus maidis with spiroplasma (corn stunt spiroplasma'CSS'Spiroplasma kunkelii), phytoplasma (maize bushy stunt phytoplasma'MBSP), and virus (maize rayado fino virus'MRFV) through transmission tests using two densities of leafhoppers (one and five adult D. maidis) collected fortnightly from maize fields during two agricultural years. During 35 months D. maidis adults were collected in maize at intervals of 15 days with entomological net (Sete Lagoas/MG, Brazil). The leafhoppers were confined in number of one or five individuals by maize plant (V2 stage) for an inoculation access period (IAP) of five days. At flowering stage, plant disease symptoms were evaluated. The total percentage of plants showing symptoms of infection by at least one of the pathogens (spiroplasma, phytoplasma or MRFV) was significantly higher for plants that were exposed to five leafhoppers (24.2%) compared to those exposed to one leafhopper (12.3%). The percent of diseased plants was similar in Autumn (20.0%), Winter (18.8%), Springer (16.1%) and Summer (18.3%). However, spiroplasma infection was predominant in Summer. Our results demonstrated that a five-fold increase in the number of D. maidis on maize plants led to a two-fold increase in the number of symptomatic plants. Under natural conditions, leafhoppers have the ability to visit multiple plants during the post-emergence phase, thereby transmitting pathogens to multiple plants t... Mostrar Tudo |
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Palavras-Chave: |
Densidade populacional; Infecciosidade natural; Manejo integrado; Natural infectivity. |
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Thesagro: |
Inseto; Vetor. |
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Thesaurus Nal: |
Insect vectors; Integrated pest management; Population density. |
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Categoria do assunto: |
O Insetos e Entomologia |
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Marc: |
LEADER 02524naa a2200265 a 4500
001 2156553
005 2023-11-10
008 2023 bl uuuu u00u1 u #d
024 7 $ahttps://doi.org/10.1007/s40858-023-00599-0$2DOI
100 1 $aOLIVEIRA, C. M. de
245 $aNatural infectivity of Dalbulus maidis populations and incidence of corn stunt and virus diseases in maize over time.$h[electronic resource]
260 $c2023
520 $aThe aim of this study was to evaluate the natural infectivity of Dalbulus maidis with spiroplasma (corn stunt spiroplasma'CSS'Spiroplasma kunkelii), phytoplasma (maize bushy stunt phytoplasma'MBSP), and virus (maize rayado fino virus'MRFV) through transmission tests using two densities of leafhoppers (one and five adult D. maidis) collected fortnightly from maize fields during two agricultural years. During 35 months D. maidis adults were collected in maize at intervals of 15 days with entomological net (Sete Lagoas/MG, Brazil). The leafhoppers were confined in number of one or five individuals by maize plant (V2 stage) for an inoculation access period (IAP) of five days. At flowering stage, plant disease symptoms were evaluated. The total percentage of plants showing symptoms of infection by at least one of the pathogens (spiroplasma, phytoplasma or MRFV) was significantly higher for plants that were exposed to five leafhoppers (24.2%) compared to those exposed to one leafhopper (12.3%). The percent of diseased plants was similar in Autumn (20.0%), Winter (18.8%), Springer (16.1%) and Summer (18.3%). However, spiroplasma infection was predominant in Summer. Our results demonstrated that a five-fold increase in the number of D. maidis on maize plants led to a two-fold increase in the number of symptomatic plants. Under natural conditions, leafhoppers have the ability to visit multiple plants during the post-emergence phase, thereby transmitting pathogens to multiple plants that become source plants for corn stunt and virus diseases. Therefore, population reduction of D. maidis can be a critical strategy for managing these diseases in maize crops.
650 $aInsect vectors
650 $aIntegrated pest management
650 $aPopulation density
650 $aInseto
650 $aVetor
653 $aDensidade populacional
653 $aInfecciosidade natural
653 $aManejo integrado
653 $aNatural infectivity
700 1 $aSABATO, E. de O.
700 1 $aBARROS, B. de A.
773 $tTropical Plant Pathology$gv. 48, p. 575-580, 2023.
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Embrapa Milho e Sorgo (CNPMS) |
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Registro Completo
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Biblioteca(s): |
Embrapa Cerrados. |
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Data corrente: |
01/06/2004 |
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Data da última atualização: |
28/10/2009 |
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Autoria: |
VILELA, L.; LEITE, G. G.; GUERRA, A. F.; MARCELINO, K. R. A.; OLIVEIRA, M. V. F. de. |
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Título: |
Produtividade do capim Marandu sob diferentes tensões hídricas no solo e doses de nitrogênio. |
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Ano de publicação: |
2002 |
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Fonte/Imprenta: |
Planaltina, DF: Embrapa Cerrados, 2002. |
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Páginas: |
18 p. |
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Série: |
(Embrapa Cerrados. Boletim de Pesquisa e Desenvolvimento, 37). |
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Idioma: |
Português |
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Notas: |
CRI6534 |
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Conteúdo: |
RESUMO: Este experimento foi conduzido na Embrapa Cerrados, Planaltina (DF), no período de março de 2000 a janeiro de 2001, em um Latossolo Vermelho-Escuro, textura argilosa. O objetivo foi o de avaliar o efeito de tensões de água no solo (35, 60, 100 e 500 kPa) e doses de nitrogênio (0, 30, 60, 120 kg/ha de N), exceto no primerio corte (0, 15, 30 e 60 kg/ha de N), na produção e na taxa de acúmulo de forragem em Brachiaria brizantha cv. Marandu. O delineamento experimental adotado foi o de blocos ao acaso, em parcelas divididas e três repetições. Nas parcelas foram alocadas as tensões e, nas subparcelas, as doses de nitrogênio. A tensão de água no solo afetou significativamente (P<0,05) a produção de forragem apenas no período de crescimento da primavera. Nesse período, observou-se redução na massa de forragem produzida até a tensão de 100 kPa. Entre as tensões de 100kPa e de 500 kPa, a produção de forragem não foi alterada. O efeito de doses de nitrogênio é significativo apenas nos períodos de crescimento de inverno e da primavera. Nesses dois períodos de crescimento, as respostas a essas são lineares, e a eficiência média de uso de N é, respectivamente, de 13,3 e 24,9 kg MS/kg de N aplicado. ABSTRACT: The effect of soil water tensions (35, 60, 100 and 500 kPa) and nitrogen rates (0, 15, 30 and 60 kg N/ha in the first cut and 0, 30, 60 and 120 kg N/ha in bubsequent cuts) on Brachiaria brizantha cv. Marandu production was studied. The experimet was carried out at Embrapa Cerrados, Planaltina (DF), from March/2000 to January/2001, in a clayey red dark Latosol. A randomized complete block design following a split-plot arrangement with three replicates was adopted. Soil water tensions were allocated in the plots and nitrogen rates represented the split-plots. The herbage production in the spring growth was significantly affected (P<0.05) by soil water tension. In this season, reduced herbage production was observed in soil water tensions up to 100 kPa. However, herbage production was not affected (P>0.05) by soil water tensions in the 100 kPa to 500 kPa range. Nitrogen rates promoted a significant (P<0.05) linear effect on herbage production during the winter and spring seasons. The average nitrogen use efficiency during the winter and spring growths was 13.3 and 24.9 kg of dry matter/kg of nitrogen applied, respectively. MenosRESUMO: Este experimento foi conduzido na Embrapa Cerrados, Planaltina (DF), no período de março de 2000 a janeiro de 2001, em um Latossolo Vermelho-Escuro, textura argilosa. O objetivo foi o de avaliar o efeito de tensões de água no solo (35, 60, 100 e 500 kPa) e doses de nitrogênio (0, 30, 60, 120 kg/ha de N), exceto no primerio corte (0, 15, 30 e 60 kg/ha de N), na produção e na taxa de acúmulo de forragem em Brachiaria brizantha cv. Marandu. O delineamento experimental adotado foi o de blocos ao acaso, em parcelas divididas e três repetições. Nas parcelas foram alocadas as tensões e, nas subparcelas, as doses de nitrogênio. A tensão de água no solo afetou significativamente (P<0,05) a produção de forragem apenas no período de crescimento da primavera. Nesse período, observou-se redução na massa de forragem produzida até a tensão de 100 kPa. Entre as tensões de 100kPa e de 500 kPa, a produção de forragem não foi alterada. O efeito de doses de nitrogênio é significativo apenas nos períodos de crescimento de inverno e da primavera. Nesses dois períodos de crescimento, as respostas a essas são lineares, e a eficiência média de uso de N é, respectivamente, de 13,3 e 24,9 kg MS/kg de N aplicado. ABSTRACT: The effect of soil water tensions (35, 60, 100 and 500 kPa) and nitrogen rates (0, 15, 30 and 60 kg N/ha in the first cut and 0, 30, 60 and 120 kg N/ha in bubsequent cuts) on Brachiaria brizantha cv. Marandu production was studied. The experimet was carried out at Embrapa Cer... Mostrar Tudo |
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Palavras-Chave: |
Cultivar Marandu; Efficiency; Eficiência; Feed grasses; Tensão. |
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Thesagro: |
Água; Brachiaria Brizantha; Capim Brachiaria; Gramínea Forrageira; Nitrogênio; Solo. |
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Thesaurus NAL: |
nitrogen; soil water potential; varieties. |
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Categoria do assunto: |
-- |
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URL: |
https://ainfo.cnptia.embrapa.br/digital/bitstream/CPAC-2009/24613/1/bolpd_37.pdf
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Marc: |
LEADER 03402nam a2200361 a 4500
001 1559759
005 2009-10-28
008 2002 bl uuuu u0uu1 u #d
100 1 $aVILELA, L.
245 $aProdutividade do capim Marandu sob diferentes tensões hídricas no solo e doses de nitrogênio.
260 $aPlanaltina, DF: Embrapa Cerrados$c2002
300 $a18 p.
490 $a(Embrapa Cerrados. Boletim de Pesquisa e Desenvolvimento, 37).
500 $aCRI6534
520 $aRESUMO: Este experimento foi conduzido na Embrapa Cerrados, Planaltina (DF), no período de março de 2000 a janeiro de 2001, em um Latossolo Vermelho-Escuro, textura argilosa. O objetivo foi o de avaliar o efeito de tensões de água no solo (35, 60, 100 e 500 kPa) e doses de nitrogênio (0, 30, 60, 120 kg/ha de N), exceto no primerio corte (0, 15, 30 e 60 kg/ha de N), na produção e na taxa de acúmulo de forragem em Brachiaria brizantha cv. Marandu. O delineamento experimental adotado foi o de blocos ao acaso, em parcelas divididas e três repetições. Nas parcelas foram alocadas as tensões e, nas subparcelas, as doses de nitrogênio. A tensão de água no solo afetou significativamente (P<0,05) a produção de forragem apenas no período de crescimento da primavera. Nesse período, observou-se redução na massa de forragem produzida até a tensão de 100 kPa. Entre as tensões de 100kPa e de 500 kPa, a produção de forragem não foi alterada. O efeito de doses de nitrogênio é significativo apenas nos períodos de crescimento de inverno e da primavera. Nesses dois períodos de crescimento, as respostas a essas são lineares, e a eficiência média de uso de N é, respectivamente, de 13,3 e 24,9 kg MS/kg de N aplicado. ABSTRACT: The effect of soil water tensions (35, 60, 100 and 500 kPa) and nitrogen rates (0, 15, 30 and 60 kg N/ha in the first cut and 0, 30, 60 and 120 kg N/ha in bubsequent cuts) on Brachiaria brizantha cv. Marandu production was studied. The experimet was carried out at Embrapa Cerrados, Planaltina (DF), from March/2000 to January/2001, in a clayey red dark Latosol. A randomized complete block design following a split-plot arrangement with three replicates was adopted. Soil water tensions were allocated in the plots and nitrogen rates represented the split-plots. The herbage production in the spring growth was significantly affected (P<0.05) by soil water tension. In this season, reduced herbage production was observed in soil water tensions up to 100 kPa. However, herbage production was not affected (P>0.05) by soil water tensions in the 100 kPa to 500 kPa range. Nitrogen rates promoted a significant (P<0.05) linear effect on herbage production during the winter and spring seasons. The average nitrogen use efficiency during the winter and spring growths was 13.3 and 24.9 kg of dry matter/kg of nitrogen applied, respectively.
650 $anitrogen
650 $asoil water potential
650 $avarieties
650 $aÁgua
650 $aBrachiaria Brizantha
650 $aCapim Brachiaria
650 $aGramínea Forrageira
650 $aNitrogênio
650 $aSolo
653 $aCultivar Marandu
653 $aEfficiency
653 $aEficiência
653 $aFeed grasses
653 $aTensão
700 1 $aLEITE, G. G.
700 1 $aGUERRA, A. F.
700 1 $aMARCELINO, K. R. A.
700 1 $aOLIVEIRA, M. V. F. de
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