Intensidade da cercosporiose da alface em cultivos convencionais e orgânicos em Pernambuco

Gomes, Andréa M.A.; Michereff, Sami Jorge; Mariano, Rosa de Lima Ramos; Rodrigues, Viviane Jurema Lopes Borges

doi:10.1590/s0100-54052006000400013

Cited by 5 publications

(4 citation statements)

References 1 publication

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…Agronomy, v. 45, e60970, 2023 The tendency of the evaluators to overestimate the severity of black spot in papaya leaves when using the scale was similar to that observed with the validation of the scales for spotted pepper (Michereff et al, 2006), Phoma spot in coffee (Salgado, Pozza, Lima, Pereira, & Pfenning, 2009) and common helminthsporiosis in corn (Lazaroto, Santos, Konflanz, Malagi, & Camochena, 2012). However, this result was in contrast with the verifications of other scales (Gomes, Michereff, & Mariano, 2004;Vivas et al, 2010;Santos et al, 2011). Although some evaluators have presented intercept values significantly different from zero (p = 0.05), the scale provided a reduction in the mean values of the intercept, which was 4.97 in the evaluation without the scale and 0.03 and 0.23 with the scale, in the first and second scaled assessments, respectively, which shows improved accuracy with the use of the scale.…”

Section: Resultssupporting

confidence: 64%

Diagrammatic scale for the quantification of black spot severity in papaya leaves

Francelino,

Vivas,

Moraes

et al. 2023

Acta Sci. Agron.

View full text Add to dashboard Cite

Black spot (Asperisporium caricae) is one of the main foliar fungal diseases of papaya crops. This disease acts directly on leaves and fruits causing leaf area reduction and fruit deterioration. The quantification of diseases is a fundamental part of the disease management and control process; therefore, a scale is required to help quantify black spot disease. The objective of this work was to propose a standardized methodology to quantify black spot severity in papaya leaves. A scale was developed considering the maximum and minimum values of the disease in the field that included eight levels of severity: 0.1, 0.3, 0.6, 1.0, 2.3, 5.0, 10.0, and 20.0%. Without the aid of a scale the disease is often overestimated, with absolute errors of approximately 75%. When the scale was used, 100% of the evaluators showed improved accuracy and precision, and absolute error was reduced to the 10% range. The scale also provided good repeatability and high reproducibility. The use of the scale provided an improvement in the R2 values, with mean values of 93 and 92 in the second and third evaluations, respectively, demonstrating that the scale is useful for different aspects of the pathosystem of A. caricae, such as for determining the efficiency of fungicides, characterization of varietal resistance, construction of the disease progression curve, and estimation of damage.

show abstract

Section: Resultssupporting

confidence: 64%

Diagrammatic scale for the quantification of black spot severity in papaya leaves

Francelino,

Vivas,

Moraes

et al. 2023

Acta Sci. Agron.

View full text Add to dashboard Cite

show abstract

“…Já, as cultivares Mimosa e Cindy apresentaram sintomas de queima bacteriana no pedúnculo sem, no entanto, ocasionar danos comerciais (nota 1,0). Gomes et al (2006) observaram em cultivos Tabela 1. Massa fresca total, massa fresca comercial, massa seca de folhas, número de folhas e diâmetro de plantas de alface (total fresh mass, marketable fresh mass, leaf dry mass, leaf number, and diameter of lettuce plants A 'Grand Rapids' apresentou bom desempenho, justificando a sua crescente procura pelos olericultores da região.…”

Section: Resultsunclassified

Produção comercial de cultivares de alface em Bananeiras

et al. 2011

View full text Add to dashboard Cite

Um aspecto importante na escolha de cultivares para uma determinada condição ambiental é a determinação da produção comercial, que indica o potencial de produção por área. O objetivo do trabalho foi avaliar a produção comercial de cultivares de alface nas condições de solo e clima de Bananeiras, Paraíba, durante a estação chuvosa. Foram avaliadas oito cultivares (Cindy, Elba, Grand Rapids, Kaesar, Mimosa, Sabrina, Summer Green e Verônica), no delineamento experimental de blocos casualizados, com quatro repetições. As parcelas tinham 27 plantas, espaçadas de 30 cm entre fileiras e entre linhas. Aos 51 dias após o transplante, as plantas foram colhidas e avaliadas quanto à massa fresca total e comercial, massa seca de folhas, número de folhas, diâmetro da planta, índice comercial e produção comercial. Os maiores valores de massa fresca total e comercial, de diâmetro da planta e produção comercial foram verificados para a cultivar Kaesar. Quanto à massa seca, 'Kaesar' e 'Elba' apresentaram os valores mais elevados. Os maiores números de folha foram obtidos com 'Mimosa', 'Elba', 'Sabrina' e 'Summer Green'. As cultivares Grand Rapids, Verônica e Kaesar mostraram-se mais suscetíveis à septoriose, principalmente nas folhas mais velhas. Considerando-se os resultados e a preferência dos consumidores, 'Kaesar' e 'Summer Green' foram as mais promissoras para introdução e testes em áreas de produção comercial de alface.

show abstract

“…In this study, there was a tendency for the evaluators to overestimate when not using the scale (c = 1.18), as in most studies involving the validation of a diagrammatic scale (Andrade et al, 2019;Azevedo de Paula et al, 2016;Belan et al, 2020;Capucho et al, 2011;Custódio et al, 2011;Menge, Makobe, Shomari, & Tiedemann, 2013, Perina et al, 2019 in plant pathology. However, when the scale was employed, the evaluators underestimated the level of heat injury, which has also occurred in certain severity levels evaluated for diseases (Gomes, Michereff, & Mariano, 2004;Michereff, Maffia, & Noronha, 2000). The Pearson's correlation coefficient indicated increased evaluator precision when using the scale (e = 0.86), as opposed to without (e = 0.76).…”

Section: Discussionmentioning

confidence: 99%

Proposed diagrammatic scale to assess heat injury in coffee seedling canopy

et al. 2023

View full text Add to dashboard Cite

A diagrammatic scale with five levels (0, 0.1 – 2.0, 2.0 – 6.0, 6.0 – 10, and 10 – 14) was developed and evaluated to measure the symptoms of heat injury in a coffee seedling canopy. The scale was constructed to increase assessment efficiency and align the estimations more closely with the actual values. Two assessments with the diagrammatic scale and one without were conducted with an interval of seven days. The evaluators using the proposed scale presented estimates with better levels of precision, accuracy, reproducibility, and repeatability than those using a conventional method. The proposed diagrammatic scale was shown to provide a reliable estimate for assessing the symptoms of heat injury on the canopy of in Coffea arabica L. seedlings. Therefore, it is possible to standardize heat injury evaluation methods using this diagrammatic scale, allowing for data comparisons with different cultivars.

show abstract

Intensidade da cercosporiose da alface em cultivos convencionais e orgânicos em Pernambuco

Cited by 5 publications

References 1 publication

Diagrammatic scale for the quantification of black spot severity in papaya leaves

Diagrammatic scale for the quantification of black spot severity in papaya leaves

Produção comercial de cultivares de alface em Bananeiras

Proposed diagrammatic scale to assess heat injury in coffee seedling canopy

Contact Info

Product

Resources

About