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Biblioteca(s): |
Epagri-Sede. |
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Data corrente: |
05/09/2023 |
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Data da última atualização: |
06/09/2023 |
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Tipo da produção científica: |
Artigo em Periódico Indexado |
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Autoria: |
CANALE, M. C.; NESI, C. N.; CASTILHOS, R. V. |
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Título: |
Abundance of Dalbulus maidis and impact of maize rayado fino disease on different genotypes in field conditions in Santa Catarina, Brazil. |
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Ano de publicação: |
2023 |
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Fonte/Imprenta: |
Tropical Plant Pathology, Viçosa, MG, v. 48, 2023. |
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Idioma: |
Inglês |
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Conteúdo: |
Corn stunt complex disease has been a major problem to maize production in Brazil. Dalbulus maidis incidence can vary greatly over the years, as well as the occurrence of corn stunt diseases. Among the corn stunt pathogens, the maize rayado fino virus (MRFV) is involved in this disease complex. MRFV is persistently transmitted by the corn leafhopper Dalbulus maidis (Hemiptera: Cicadellidae) in a persistent propagative relationship. In this work, we assessed the abundance of D. maidis and rayado fino in experimental field plots with a commercial hybrid (P4285 VYHR) and an open pollinated variety (SCS156 Colorado) in the early phase of the planting in the late-sowing season, in two consecutive crop years (2020?21 and 2021?22), in Chapecó, Santa Catarina (South Brazil). Also, we evaluated the incidence of rayado fino and counted corn leafhoppers that were infesting MRFV-symptomatic and asymptomatic plants. D. maidis did not sort between the two maize genotypes in field conditions, but preferentially infests asymptomatic plants. This could be an evidence for the vector manipulation to aid pathogen spread. Incidence of rayado fino is greater in P4285 than in Colorado in early vegetative stages of maize and impacted plant production in about 40%. Additionally, we evaluated the incidence of rayado fino in 18 commercial maize genotypes in a field plot experiment at 50 days after sowing in the early-sowing season of the 2022?23 crop year. These genotypes showed a differential incidence to the disease, which could be explored in breeding programs. Our results also support that the corn stunt complex pathosystem, with the rayado fino viral disease, is dynamic and unequal over the years. MenosCorn stunt complex disease has been a major problem to maize production in Brazil. Dalbulus maidis incidence can vary greatly over the years, as well as the occurrence of corn stunt diseases. Among the corn stunt pathogens, the maize rayado fino virus (MRFV) is involved in this disease complex. MRFV is persistently transmitted by the corn leafhopper Dalbulus maidis (Hemiptera: Cicadellidae) in a persistent propagative relationship. In this work, we assessed the abundance of D. maidis and rayado fino in experimental field plots with a commercial hybrid (P4285 VYHR) and an open pollinated variety (SCS156 Colorado) in the early phase of the planting in the late-sowing season, in two consecutive crop years (2020?21 and 2021?22), in Chapecó, Santa Catarina (South Brazil). Also, we evaluated the incidence of rayado fino and counted corn leafhoppers that were infesting MRFV-symptomatic and asymptomatic plants. D. maidis did not sort between the two maize genotypes in field conditions, but preferentially infests asymptomatic plants. This could be an evidence for the vector manipulation to aid pathogen spread. Incidence of rayado fino is greater in P4285 than in Colorado in early vegetative stages of maize and impacted plant production in about 40%. Additionally, we evaluated the incidence of rayado fino in 18 commercial maize genotypes in a field plot experiment at 50 days after sowing in the early-sowing season of the 2022?23 crop year. These genotypes showed a differential inciden... Mostrar Tudo |
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Thesagro: |
Corn stunt complex; Gompertz model; Logistic model; Maize production; nsect vector abundance; Resistance of maize genotypes. |
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Categoria do assunto: |
F Plantas e Produtos de Origem Vegetal |
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Marc: |
LEADER 02417naa a2200217 a 4500
001 1133607
005 2023-09-06
008 2023 bl uuuu u00u1 u #d
100 1 $aCANALE, M. C.
245 $aAbundance of Dalbulus maidis and impact of maize rayado fino disease on different genotypes in field conditions in Santa Catarina, Brazil.$h[electronic resource]
260 $c2023
520 $aCorn stunt complex disease has been a major problem to maize production in Brazil. Dalbulus maidis incidence can vary greatly over the years, as well as the occurrence of corn stunt diseases. Among the corn stunt pathogens, the maize rayado fino virus (MRFV) is involved in this disease complex. MRFV is persistently transmitted by the corn leafhopper Dalbulus maidis (Hemiptera: Cicadellidae) in a persistent propagative relationship. In this work, we assessed the abundance of D. maidis and rayado fino in experimental field plots with a commercial hybrid (P4285 VYHR) and an open pollinated variety (SCS156 Colorado) in the early phase of the planting in the late-sowing season, in two consecutive crop years (2020?21 and 2021?22), in Chapecó, Santa Catarina (South Brazil). Also, we evaluated the incidence of rayado fino and counted corn leafhoppers that were infesting MRFV-symptomatic and asymptomatic plants. D. maidis did not sort between the two maize genotypes in field conditions, but preferentially infests asymptomatic plants. This could be an evidence for the vector manipulation to aid pathogen spread. Incidence of rayado fino is greater in P4285 than in Colorado in early vegetative stages of maize and impacted plant production in about 40%. Additionally, we evaluated the incidence of rayado fino in 18 commercial maize genotypes in a field plot experiment at 50 days after sowing in the early-sowing season of the 2022?23 crop year. These genotypes showed a differential incidence to the disease, which could be explored in breeding programs. Our results also support that the corn stunt complex pathosystem, with the rayado fino viral disease, is dynamic and unequal over the years.
650 $aCorn stunt complex
650 $aGompertz model
650 $aLogistic model
650 $aMaize production
650 $ansect vector abundance
650 $aResistance of maize genotypes
700 1 $aNESI, C. N.
700 1 $aCASTILHOS, R. V.
773 $tTropical Plant Pathology, Viçosa, MG$gv. 48, 2023.
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Biblioteca(s): |
Epagri-Sede. |
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Data corrente: |
21/10/2019 |
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Data da última atualização: |
21/10/2019 |
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Tipo da produção científica: |
Resumo em Anais de Congresso |
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Autoria: |
SOUZA, R. V.; YOUNGER, A. D.; ALVES, M. T.; CAMPOS, C. J. A. |
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Título: |
AN INVESTIGATION OF HOW THE CLASSIFICATION STATUS OF SHELLFISH PRODUCTION AREAS MAY BE AFFECTED BY THE NUMBER OF Escherichia coli RESULTS ASSESSED. |
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Ano de publicação: |
2019 |
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Fonte/Imprenta: |
In: AQUACULTURE EUROPE 19, 19., 2019, Berlim, Alemanha. Abstracts... Berlim: Aquaculture Europe, 2019. |
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Idioma: |
Inglês |
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Conteúdo: |
The classification of shellfish production areas (SPAs) in many shellfish producing countries is based on monitoring for faecal indicator organisms. This monitoring assesses the risk of contamination with pathogens and determines the level of post-harvest treatment necessary for the shellfish prior to sale for human consumption. This study investigated the effect of the number of E. coli monitoring results on the classification status of SPAs using the A, B and C classification criteria prescribed in the European Food Hygiene Regulations. The assessment was based on a database of E. coli results obtained from monitoring in shellfish from seven production areas (>255 sample results/SPA) on the coast of Santa Catarina (Brazil). It was found that six SPAs would be classified as B and one as C if all the available results were considered. Ten series of 50 data samples were randomly extracted from each production area dataset (12?120 results/sample, in multiples of 12). Classifications given to each data sample resulted in two production areas that had been given B status based on the full database being classified more times as A than as B when data samples with 12 results were considered. In general, the number of data samples compliant with class A decreased with the higher the number of E. coli results that were assessed per data sample. The results indicate that areas with class B status can be misclassified as A during the initial classification when fewer results are available. Furthermore, areas with ?prohibited? status can be misclassified as C during the initial classification, when 12 results are considered in compliance assessments. This study did not identify the same potential misclassification issue in relation to SPAs with classifications ranging between B and C. These classes share the same maximum limit (46,000 MPN/100g), therefore, compliance with 4,600 MPN/100g is the legal standard that differentiates the two. This study identifies two factors that may lead to misclassification of a production area: the varying number of results considered in the compliance assessment; and the consideration of maximum E. coli result as a legislative standard. Therefore, possible ways of minimising the risk of misclassification include the adoption of other statistics as microbiological legislative standards rather than maximum E. coli result or the consistent use of a fixed amount of results to classifying SPAs during initial and ongoing monitoring. These results emphasise the need to consider long-term monitoring datasets in compliance assessments to ensure that the classification status of SPAs truly reflects environmental contamination levels. MenosThe classification of shellfish production areas (SPAs) in many shellfish producing countries is based on monitoring for faecal indicator organisms. This monitoring assesses the risk of contamination with pathogens and determines the level of post-harvest treatment necessary for the shellfish prior to sale for human consumption. This study investigated the effect of the number of E. coli monitoring results on the classification status of SPAs using the A, B and C classification criteria prescribed in the European Food Hygiene Regulations. The assessment was based on a database of E. coli results obtained from monitoring in shellfish from seven production areas (>255 sample results/SPA) on the coast of Santa Catarina (Brazil). It was found that six SPAs would be classified as B and one as C if all the available results were considered. Ten series of 50 data samples were randomly extracted from each production area dataset (12?120 results/sample, in multiples of 12). Classifications given to each data sample resulted in two production areas that had been given B status based on the full database being classified more times as A than as B when data samples with 12 results were considered. In general, the number of data samples compliant with class A decreased with the higher the number of E. coli results that were assessed per data sample. The results indicate that areas with class B status can be misclassified as A during the initial classification when fewer results are ... Mostrar Tudo |
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Palavras-Chave: |
aquaculture; Legislation; public health; shellfish. |
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Categoria do assunto: |
L Ciência Animal e Produtos de Origem Animal |
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Marc: |
LEADER 03403naa a2200205 a 4500
001 1128954
005 2019-10-21
008 2019 bl uuuu u00u1 u #d
100 1 $aSOUZA, R. V.
245 $aAN INVESTIGATION OF HOW THE CLASSIFICATION STATUS OF SHELLFISH PRODUCTION AREAS MAY BE AFFECTED BY THE NUMBER OF Escherichia coli RESULTS ASSESSED.$h[electronic resource]
260 $c2019
520 $aThe classification of shellfish production areas (SPAs) in many shellfish producing countries is based on monitoring for faecal indicator organisms. This monitoring assesses the risk of contamination with pathogens and determines the level of post-harvest treatment necessary for the shellfish prior to sale for human consumption. This study investigated the effect of the number of E. coli monitoring results on the classification status of SPAs using the A, B and C classification criteria prescribed in the European Food Hygiene Regulations. The assessment was based on a database of E. coli results obtained from monitoring in shellfish from seven production areas (>255 sample results/SPA) on the coast of Santa Catarina (Brazil). It was found that six SPAs would be classified as B and one as C if all the available results were considered. Ten series of 50 data samples were randomly extracted from each production area dataset (12?120 results/sample, in multiples of 12). Classifications given to each data sample resulted in two production areas that had been given B status based on the full database being classified more times as A than as B when data samples with 12 results were considered. In general, the number of data samples compliant with class A decreased with the higher the number of E. coli results that were assessed per data sample. The results indicate that areas with class B status can be misclassified as A during the initial classification when fewer results are available. Furthermore, areas with ?prohibited? status can be misclassified as C during the initial classification, when 12 results are considered in compliance assessments. This study did not identify the same potential misclassification issue in relation to SPAs with classifications ranging between B and C. These classes share the same maximum limit (46,000 MPN/100g), therefore, compliance with 4,600 MPN/100g is the legal standard that differentiates the two. This study identifies two factors that may lead to misclassification of a production area: the varying number of results considered in the compliance assessment; and the consideration of maximum E. coli result as a legislative standard. Therefore, possible ways of minimising the risk of misclassification include the adoption of other statistics as microbiological legislative standards rather than maximum E. coli result or the consistent use of a fixed amount of results to classifying SPAs during initial and ongoing monitoring. These results emphasise the need to consider long-term monitoring datasets in compliance assessments to ensure that the classification status of SPAs truly reflects environmental contamination levels.
653 $aaquaculture
653 $aLegislation
653 $apublic health
653 $ashellfish
700 1 $aYOUNGER, A. D.
700 1 $aALVES, M. T.
700 1 $aCAMPOS, C. J. A.
773 $tIn: AQUACULTURE EUROPE 19, 19., 2019, Berlim, Alemanha. Abstracts... Berlim: Aquaculture Europe, 2019.
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