Escala diagramática para a quantificação de Septoria apiicola e Cercospora arracacina em mandioquinha-salsa

Mesquini, Renata Moreschi; Schwan-Estrada, Kátia Regina Freitas; Godoy, C. V.; Vieira, Rafael Augusto; Zárate, Néstor A. Heredia; Vieira, Maria do Carmo

doi:10.1590/s1982-56762009000400008

Cited by 8 publications

(4 citation statements)

References 12 publications

(12 reference statements)

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“…SADs have improved the accuracy and precision of estimates of septoriosis severity in some crops, including S. glycines in soybean (Polizel & Juliatti, 2010), S. helianthi in sunflower (Lenz et al, 2009) and S. apicola in mandioquinha-salsa (Mesquini et al, 2009). However, this study is the very first record of a SADs used to estimate the septoriosis severity in sour passion fruit.…”

Section: /9mentioning

confidence: 99%

Standard area diagram set for quantification of septoriosis in fruit of sour passion fruit

Costa¹,

Peixoto²,

Blum³

et al. 2019

Agraria

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A standard area diagram set (SADs) for severity evaluation of septoriosis (Septoria passiflorae) in fruit of sour passion fruit (Passiflora edulis Sims) was developed and validated in this study. The SADs presented eight severity levels (0.3; 0.5; 1; 2; 4; 10; 18; and 30%). For its validation, 20 raters were divided into groups (G1 and G3, inexperienced; G2 and G4, experienced) who initially estimated the disease severity without the aid of the SADs. Subsequently, G1 and G2 performed the second evaluation without the SADs, and G3 and G4 completed the second evaluation with the proposed SADs for each disease. The accuracy and precision of the evaluations were determined by simple linear regression and by Lin's concordance correlation coefficient. The proposed SADs allowed accurate and precise quantification of septoriosis severity, increasing the agreement between estimated and actual values. The increase in accuracy and precision in the non-aided groups, when present, was less pronounced than those increments observed in the SADs-aided groups. Lin's concordance correlation coefficient confirmed the increases in accuracy and precision detected by the linear regression analysis.Escala diagramática para a quantificação da severidade da septoriose em frutos do maracujazeiro azedo RESUMO: Uma escala diagramática para a avaliação da severidade da septoriose (Septoria passiflorae) em frutos do maracujazeiro azedo (Passiflora edulis Sims) foi desenvolvida e validada neste estudo. A escala diagramática apresentou oito níveis de severidade (0,3; 0,5; 1; 2; 4; 10; 18; e 30%). Para a sua validação, os 20 avaliadores foram divididos em grupos (G1 e G3, sem experiência; G2 e G4, com experiência), que inicialmente estimaram a severidade da doença sem auxílio da escala. Posteriormente, G1 e G2 fizeram outra avaliação sem escala, e G3 e G4 realizaram a avaliação com a escala proposta. A acurácia e a precisão das estimativas foram determinadas por regressão linear simples e pelo coeficiente de correlação de concordância de Lin. A escala diagramática proposta permitiu quantificar a severidade da septoriose de forma acurada e precisa, aumentando a concordância entre os valores estimados e os reais. O aumento da acurácia e precisão nos grupos que realizaram dupla avaliação sem escala, quando ocorreu, foi mais discreto que os incrementos observados nos grupos que utilizaram a escala. A análise de concordância de Lin confirmou os incrementos da acurácia e precisão detectados pela análise de regressão linear. Palavras-chave: frutos; Passiflora edulis Sims; fitopatometria; Septoria passifloraeStandard area diagram set for quantification of septoriosis in fruit of sour passion fruit Rev. Bras.

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Section: /9mentioning

confidence: 99%

Standard area diagram set for quantification of septoriosis in fruit of sour passion fruit

Costa¹,

Peixoto²,

Blum³

et al. 2019

Agraria

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“…O valor máximo de severidade da doença não está de acordo com as observações de Kranz (1977), em que muitas mensurações em campo envolvem níveis de severidade inferiores a 30%. Porém, em várias outras escalas diagramáticas, é possível encontrar valores máximos superiores a 30% (Amorim et al 1993, Godoy et al 1997, Mello et al 1997, Díaz et al 2001, Leite & Amorim 2002, Martins et al 2004, Angelotti et al 2008, Mesquini et al 2009, Salgado et al 2009, Soares et al 2009). Estes valores apenas refletem a severidade máxima da doença encontrada no campo, o que pode variar, dependendo da relação patógeno--hospedeiro, sem, contudo, interferir na acurácia e precisão da escala diagramática confeccionada a partir destes valores.…”

Section: Resultsunclassified

“…Já existem escalas diagramáticas para avaliação da severidade de doenças para diversas hortaliças, como tomateiro (Boff et al 1991, Mello et al 1997), alface (O' Brien & Van Bruggen 1992, inhame (Michereff et al 2000), melancia (Halfeld-Vieira & Nechet 2006), mandioquinha-salsa (Mesquini et al 2009) e, inclusive, para o pepineiro (Azevedo 1997), porém, nenhum trabalho contemplou a mancha alvo em pepineiro. Por esta razão, o objetivo deste trabalho foi elaborar uma escala diagramática de fácil utilização e que reproduza resultados precisos e acurados, visando a auxiliar estudos epidemiológicos e de controle de Corynespora cassiicola em pepineiro, em virtude do aumento da importância desta doença e da falta de informações sobre a interação pepineiro--Corynespora-ambiente.…”

Section: Palavras-chaveunclassified

Escala Diagramática Para Avaliação Da Severidade Da Mancha Alvo Em Folhas De Pepineiro

Teramoto

Aguiar

Garcia

et al. 2011

Pesq. Agropec. Trop.

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ramos, e já foi relatado em mais de 312 hospedeiros, em regiões tropicais e subtropicais (Farr et al. 2009). No Brasil, a mancha alvo vem ocorrendo, com certa frequência, nos Estados de São Paulo e Paraná, em pepinos do tipo 'japonês', cultivados em estufas (Martins et al. 2003, Verzignassi et al. 2003), e no Estado de Goiás, também em pepino japonês, em campo aberto (Teramoto et al. 2006).

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“…Since then, several SAD sets have been developed and published using logarithmic increments to determine intermediate values of disease severity (Mesquini et al, 2009;Vieira et al, 2014;Ortega-Acosta et al, 2016). Moreover, some researchers have published SAD sets using linear increments (Capucho et al, 2011;Rios et al, 2013;Debona et al, 2015).…”

Section: Introductionmentioning

confidence: 99%

Aetiology and epidemiology of grapevine anthracnose

Santos¹

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Aetiology and epidemiology of grapevine anthracnose Grapevine anthracnose is an important disease, responsible for severe yield losses in humid regions around the world. This study aimed to: i: identify the causal agents of grapevine anthracnose in Brazil; ii: characterize Elsinoë ampelina isolates from Brazil and Australia by means of phylogenetic analyses, morphological features and pathogenicity tests; iii: develop an efficient method for conidial production of E. ampelina; iv: develop and validate a standard area diagram set (SADs) for assessing anthracnose severity on grapevine leaves; and v: study the temporal and spatial progression of anthracnose in a Brazilian vineyard. To identify the causal agents of the disease, leaves, stems and berries with anthracnose symptoms were collected from 38 vineyards in southern and southeastern Brazil and 39 E. ampelina and 13 Colletotrichum spp. isolates were obtained. For E. ampelina isolates, the internal transcribed spacer (ITS), histone H3 (HIS3) and elongation factor 1-α (TEF) sequences were analysed. HIS3 was the most informative region with 55 polymorphic sites. Seven Colletotrichum species were identified: C. siamense, C. gloeosporioides, C. fructicola, C. viniferum, C. nymphaeae, C. truncatum and C. cliviae. In pathogenicity tests, only E. ampelina isolates caused anthracnose symptoms on Vitis vinifera 'Moscato Giallo' and Vitis labrusca 'Niagara Rosada'. To characterize E. ampelina from Brazil and Australia, 35 isolates were analysed. ITS and TEF sequences of all isolates were monomorphic. The haplotype network generated from HIS3 dataset showed four distinct haplotypes. High genetic variability was observed in two Brazilian isolates, haplotype EA4, which may have lost the intron region during species evolution. Colonies showed variable coloration, wrinkled texture, absence of spores and slow growth. Brazilian isolates produced conidia larger than conidia from Australian isolates. To induce the conidial production, mycelial fragments were shake-incubated in rainwater and distilled water for 7 days. Isolates produced different concentrations of conidia and the conidial germination was more than 88.5%. In infectivity tests, conidia caused typical anthracnose symptoms on leaves. The SADs developed comprises six true colour diagrams with severity ranging from 1.1 to 27.4%. The use of the SADs improved the accuracy, precision, agreement and inter-rater reliability of the estimates conducted by 12 raters. The temporal and spatial dynamics of anthracnose was carried out in a 'Niagara Rosada' vineyard in 2014 and 2015. The incidence of vines with diseased leaves, stems and berries and the severity disease on leaves were recorded. Anthracnose symptoms occurred rapidly after bud break and ontogenic resistance was observed for all organs assessed. The monomolecular model showed the best fit to the incidence progress. Temporal analyses suggest that the progress of anthracnose incidence and severity over time is governed mainly by the primary inoculum due to age-related res...

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Escala diagramática para a quantificação de Septoria apiicola e Cercospora arracacina em mandioquinha-salsa

Cited by 8 publications

References 12 publications

Standard area diagram set for quantification of septoriosis in fruit of sour passion fruit

Standard area diagram set for quantification of septoriosis in fruit of sour passion fruit

Escala Diagramática Para Avaliação Da Severidade Da Mancha Alvo Em Folhas De Pepineiro

Aetiology and epidemiology of grapevine anthracnose

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