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Registro Completo |
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Biblioteca(s): |
Epagri-Sede. |
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Data corrente: |
30/09/2022 |
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Data da última atualização: |
30/09/2022 |
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Tipo da produção científica: |
Resumo em Anais de Congresso |
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Autoria: |
CASTILHOS, R. V.; NESI, C. N.; SILVA, M. C. C. R. |
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Título: |
Spatial and temporal incidence of maize rayado fino disease in a second crop season experimental field in Chapecó, Santa Catarina, Brazil. |
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Ano de publicação: |
2022 |
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Fonte/Imprenta: |
In: WORKSHOP BRASILEIRO DE EPIDEMIOLOGIA DE DOENÇAS DE PLANTAS, 6., 2022, Chapecó, SC. Resumos... Brasília: Sociedade Brasileira de Fitopatologia, 2022. p. 40 |
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Idioma: |
Inglês |
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Conteúdo: |
The Maize rayado fino virus (MRFV) is the causal agent of the maize rayado fino (MRF)
disease and is transmitted to plants by the insect vector Dalbulus maidis (Hemiptera:
Cicadellidae). The main symptom is characterized by numerous small chlorotic spots
along leaf veins, and the disease has the potential to significantly reduce grain yield. To
better understand this disease dynamics, we evaluated the spatial distribution pattern and
the temporal evolution of MRF incidence on second crop season maize in an experimental
field in Chapecó (Western Santa Catarina). The genotype used was P30F53 VYHR,
sowed in a field of 24 rows spaced in 0.9 m and 30 m long, in February 2019. All the 2880
plants that composed the experimental field were visually evaluated at 5, 8 and 11 weeks
after sowing, corresponding approximately to V8, V11 and R2 phenological stages,
respectively. Plants were assigned as diseased or healthy and mapped. The statistical
analysis of spatial and temporal incidence of MRF was carried out with software R, using
Rcitrus package. The disease incidence was 6.8%, 33.4% and 53.6% at 5, 8 and 11
weeks after sowing, respectively. The dispersion index was calculated to three different
quadrat sizes (2x6, 3x9 and 4x12) and indicated aggregated distribution of the disease for
all quadrat sizes in all evaluation dates (p<0.05). The Monte Carlo test also indicated
aggregated pattern of MRF distribution in a 3 m radius, with respective 2.1 and 1.6
observed and estimated diseased neighbors near to other infected plants at 5 weeks
(p=0.005); 8.4 and 8.1 observed and estimated diseased neighbors, respectively, at 8
weeks (p=0.003) and 13.5 and 13.0 respective observed and estimated diseased
neighbors at 11 weeks (p=0.0017). The dispersal kernel showed higher aggregation of
disease in the border of the experimental filed. The disease gradient increased from the
borders to the center of the experimental field along the three evaluations, suggesting
primary dissemination of MRFV in the bordering plants by infective leafhoppers that
probably emigrated from older adjacent maize crop. It was verified a 5 fold increase in the
disease incidence on the second evaluation in relation to the first assessment, evidencing
that a secondary dissemination of MRFV inside the experimental field also happened,
which resulted in the inoculation of plants in the center of the experimental field, in a later
developmental stage of the crop. These results help to understand MRF incidence and
evolution within a crop situation, and can be useful to plan accurate management
strategies as seed treatment, early chemical control of the vector, especially on the crop
borders and sowing synchronization in order to avoid the establishment of new fields
close to older contaminated crops. MenosThe Maize rayado fino virus (MRFV) is the causal agent of the maize rayado fino (MRF)
disease and is transmitted to plants by the insect vector Dalbulus maidis (Hemiptera:
Cicadellidae). The main symptom is characterized by numerous small chlorotic spots
along leaf veins, and the disease has the potential to significantly reduce grain yield. To
better understand this disease dynamics, we evaluated the spatial distribution pattern and
the temporal evolution of MRF incidence on second crop season maize in an experimental
field in Chapecó (Western Santa Catarina). The genotype used was P30F53 VYHR,
sowed in a field of 24 rows spaced in 0.9 m and 30 m long, in February 2019. All the 2880
plants that composed the experimental field were visually evaluated at 5, 8 and 11 weeks
after sowing, corresponding approximately to V8, V11 and R2 phenological stages,
respectively. Plants were assigned as diseased or healthy and mapped. The statistical
analysis of spatial and temporal incidence of MRF was carried out with software R, using
Rcitrus package. The disease incidence was 6.8%, 33.4% and 53.6% at 5, 8 and 11
weeks after sowing, respectively. The dispersion index was calculated to three different
quadrat sizes (2x6, 3x9 and 4x12) and indicated aggregated distribution of the disease for
all quadrat sizes in all evaluation dates (p<0.05). The Monte Carlo test also indicated
aggregated pattern of MRF distribution in a 3 m radius, with respective 2.1 and 1.6
observed and estimated diseas... Mostrar Tudo |
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Thesagro: |
corn leafhopper; corn stunt complex. |
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Categoria do assunto: |
F Plantas e Produtos de Origem Vegetal |
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Marc: |
LEADER 03481naa a2200169 a 4500
001 1132468
005 2022-09-30
008 2022 bl uuuu u00u1 u #d
100 1 $aCASTILHOS, R. V.
245 $aSpatial and temporal incidence of maize rayado fino disease in a second crop season experimental field in Chapecó, Santa Catarina, Brazil.$h[electronic resource]
260 $c2022
520 $aThe Maize rayado fino virus (MRFV) is the causal agent of the maize rayado fino (MRF) disease and is transmitted to plants by the insect vector Dalbulus maidis (Hemiptera: Cicadellidae). The main symptom is characterized by numerous small chlorotic spots along leaf veins, and the disease has the potential to significantly reduce grain yield. To better understand this disease dynamics, we evaluated the spatial distribution pattern and the temporal evolution of MRF incidence on second crop season maize in an experimental field in Chapecó (Western Santa Catarina). The genotype used was P30F53 VYHR, sowed in a field of 24 rows spaced in 0.9 m and 30 m long, in February 2019. All the 2880 plants that composed the experimental field were visually evaluated at 5, 8 and 11 weeks after sowing, corresponding approximately to V8, V11 and R2 phenological stages, respectively. Plants were assigned as diseased or healthy and mapped. The statistical analysis of spatial and temporal incidence of MRF was carried out with software R, using Rcitrus package. The disease incidence was 6.8%, 33.4% and 53.6% at 5, 8 and 11 weeks after sowing, respectively. The dispersion index was calculated to three different quadrat sizes (2x6, 3x9 and 4x12) and indicated aggregated distribution of the disease for all quadrat sizes in all evaluation dates (p<0.05). The Monte Carlo test also indicated aggregated pattern of MRF distribution in a 3 m radius, with respective 2.1 and 1.6 observed and estimated diseased neighbors near to other infected plants at 5 weeks (p=0.005); 8.4 and 8.1 observed and estimated diseased neighbors, respectively, at 8 weeks (p=0.003) and 13.5 and 13.0 respective observed and estimated diseased neighbors at 11 weeks (p=0.0017). The dispersal kernel showed higher aggregation of disease in the border of the experimental filed. The disease gradient increased from the borders to the center of the experimental field along the three evaluations, suggesting primary dissemination of MRFV in the bordering plants by infective leafhoppers that probably emigrated from older adjacent maize crop. It was verified a 5 fold increase in the disease incidence on the second evaluation in relation to the first assessment, evidencing that a secondary dissemination of MRFV inside the experimental field also happened, which resulted in the inoculation of plants in the center of the experimental field, in a later developmental stage of the crop. These results help to understand MRF incidence and evolution within a crop situation, and can be useful to plan accurate management strategies as seed treatment, early chemical control of the vector, especially on the crop borders and sowing synchronization in order to avoid the establishment of new fields close to older contaminated crops.
650 $acorn leafhopper
650 $acorn stunt complex
700 1 $aNESI, C. N.
700 1 $aSILVA, M. C. C. R.
773 $tIn: WORKSHOP BRASILEIRO DE EPIDEMIOLOGIA DE DOENÇAS DE PLANTAS, 6., 2022, Chapecó, SC. Resumos... Brasília: Sociedade Brasileira de Fitopatologia, 2022. p. 40
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Epagri-Sede (Epagri-Sede) |
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Biblioteca(s): |
Epagri-Sede. |
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Data corrente: |
23/09/2013 |
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Data da última atualização: |
23/09/2013 |
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Tipo da produção científica: |
Artigo em Anais de Congresso / Nota Técnica |
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Autoria: |
CASSOL, G. V.; ÁVILA, L. A.; ZEMOLIN, C. L.; CASSOL, L. L.; NOLDIN, J. A. |
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Título: |
Emergência de arroz vermelho em função'de épocas de semeadura do arroz irrigado. |
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Ano de publicação: |
2013 |
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Fonte/Imprenta: |
In: CONGRESSO BRASILEIRO DE ARROZ IRRIGADO, 8., 2013, Santa Maria, RS. Anais... Santa Maria, RS: UFSM; Sobai, 2013. p. 493-496. |
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Idioma: |
Português |
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Conteúdo: |
Emergência de arroz vermelho em função'de épocas de semeadura do arroz irrigado. |
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Palavras-Chave: |
Arroz irrigado; Oryza sativa; Planta daninha; Prática cultural. |
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Categoria do assunto: |
F Plantas e Produtos de Origem Vegetal |
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Marc: |
LEADER 00788naa a2200217 a 4500
001 1119125
005 2013-09-23
008 2013 bl uuuu u00u1 u #d
100 1 $aCASSOL, G. V.
245 $aEmergência de arroz vermelho em função'de épocas de semeadura do arroz irrigado.$h[electronic resource]
260 $c2013
520 $aEmergência de arroz vermelho em função'de épocas de semeadura do arroz irrigado.
653 $aArroz irrigado
653 $aOryza sativa
653 $aPlanta daninha
653 $aPrática cultural
700 1 $aÁVILA, L. A.
700 1 $aZEMOLIN, C. L.
700 1 $aCASSOL, L. L.
700 1 $aNOLDIN, J. A.
773 $tIn: CONGRESSO BRASILEIRO DE ARROZ IRRIGADO, 8., 2013, Santa Maria, RS. Anais... Santa Maria, RS: UFSM; Sobai, 2013. p. 493-496.
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