Escala diagramática para avaliação da severidade de bacteriose em pessegueiro

Citadin, Idémir; Assmann, André Paulo; Mazaro, Sérgio Miguel; Gouvêa, Alfredo de; Danner, Moeses Andrigo; Malagi, Gustavo

doi:10.1590/s0100-29452008000200010

Cited by 10 publications

(7 citation statements)

References 6 publications

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“…The accuracy of estimates of each rater was determined by a t-test applied to the intercept of linear regression (a) to validate the hypothesis H o : a = 0, and to the slope coefficient of the line ( (Citadin et al, 2008;Duan et al, 2015), suggesting that this genus may cause severe damages when not adequately controlled. Severity values above 88% are rarely observed in sour passion fruit since they result in rapid leaf senescence.…”

Section: Methodsmentioning

confidence: 99%

Standard Area Diagram Set for Bacterial Spot Quantification in Entire-Margined Leaves of Sour Passion Fruit

Costa¹,

Peixoto²,

Blum³

et al. 2019

JAS

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This study developed and validated a standard area diagram set (SADs) to aid in the estimation of bacterial spot (Xanthomonas axonopodis pv. passiflorae) severity in entire-margined leaves of sour passion fruit (Passiflora edulis Sims). The SADs consisted of eight severity levels (3; 6; 12; 25; 50; 77, and 88%). For its validation, 20 raters, who initially estimated the disease severity without the aid of the SADs, were divided into groups (G1 and G3, inexperienced; G2 and G4, experienced). Subsequently, G1 and G2 performed the second evaluation without the SADs, and G3 and G4 completed the second evaluation using the proposed SADs. The accuracy and precision of the assessments were determined by simple linear regression and by the Lin’s concordance correlation coefficient. The increase in accuracy was confirmed by the 80% constant error-free estimates (G3 and G4) and 100% (G3) and 80% (G4) systematic error-free estimates when the SADs was used. Precision increased with the increase in the coefficient of determination, the reduction in absolute errors, and the increase in the reproducibility of the estimates between pairs of raters. Inexperienced raters benefited the most from the use of the SADs. The increase in the accuracy and precision in the non-aided groups, when present, was less pronounced than those increments observed in the SADs-aided groups. The Lin’s concordance correlation coefficient confirmed the increased accuracy and precision detected by the linear regression analysis and indicated increased agreement between the estimated and actual values of disease severity in the SADs-aided groups.

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Section: Methodsmentioning

confidence: 99%

Standard Area Diagram Set for Bacterial Spot Quantification in Entire-Margined Leaves of Sour Passion Fruit

Costa¹,

Peixoto²,

Blum³

et al. 2019

JAS

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“…pruni, foram coletadas, quinzenalmente, a partir do aparecimento dos primeiros sintomas, 10 folhas por planta para realização de observações visuais de acordo com a escala diagramática proposta por Citadin et al (2008). Com os dados da severidade obtidos de 8 avaliações em cada ciclo, foi determinada a área abaixo da curva de progresso da doença (AACPD), segundo Shaner e Finney (1977).…”

Section: Methodsunclassified

Desenvolvimento e fitossanidade de ameixeiras tratadas com silício em sistema orgânico

et al. 2013

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RESUMO -O objetivo deste trabalho foi avaliar o efeito do silício (Si) aplicado via pulverização foliar em ameixeiras cv. Pluma 7, para o controle da bacteriose (Xanthomonas arborícola pv. pruni), mariposa oriental (Grapholita molesta) e pulgão-verde (Myzus persicae), bem como no desenvolvimento das plantas, em sistema orgânico de produção. Para o ensaio, foi utilizado o produto comercial AgriSil ® (98% de SiO 2 ). O experimento foi conduzido em Guarapuava-PR, durante dois ciclos consecutivos (2010/2011 e 2011/2012). As doses utilizadas foram: 0; 1; 2;4 e 8 g L -1 do produto comercial, aplicadas quinzenalmente. Nos dois ciclos de avaliação, foram observadas reduções de até 85% na incidência da bacteriose com efeito quadrático das doses de silício. Os danos causados pela mariposa oriental, o número de pulgões, o diâmetro e o comprimento de ramos das plantas de ameixeira não foram significativamente influenciados pelas aplicações de SiO 2 . Quanto ao teor de Si foliar, observou-se efeito linear positivo em função das doses de Si. Termos para indexação: Prunus salicina, nutrição mineral, manejo integrado, agroecologia. DEVELOPMENT AND FITOSSANITY ON PLUM TREES TREATED WITH SILICON IN ORGANIC SYSTEMABSTRACT -The objective of this study was to evaluate the effect of silicon (Si) applied via foliar in plum trees cv. Pluma 7 for the control of bacterial blight (Xanthomonas arboreal pv. pruni), oriental fruit moth (Grapholita molesta) and green aphid (Myzus persicae), as well as in plant development, in organic management. For this trial it was used the commercial product AgriSil ® (98% SiO 2 ). The experiment was carried out in Guarapuava-PR, Brazil, by two consecutive cycles (2010/2011 and 2011/2012). The doses used were 0, 1, 2, 4 and 8 g L -1 of the commercial product, each two weeks. In both cycles, for the plum bacterial blight, it was verified until 85% incidence reduction, with quadratic effect of silicon doses. For the damage of oriental fruit moth, number of aphids, diameter and length of shoots no significant difference between the doses of SiO 2 were found. For Si leaf content, a positive linear effect was verified in function of Si doses.

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“…The incidence, severity, and defoliation caused by the bacterial infection were quantified at each evaluation. The diagrammatic scale developed by Citadin et al (2008) was used to assess severity (Fig. 2).…”

Section: Methodsmentioning

confidence: 99%

“…A comparison among genotypes was performed using a modification of the duration of healthy leaf area model (Waggoner and Berger, 1987) to express the values in each shoot with a maximum severity of 55.3% (Citadin et al, 2008;Medeiros et al, 2011).…”

Section: Methodsmentioning

confidence: 99%

Reaction of Peach Genotypes to Bacterial Leaf Spot: Correlations with Environmental Conditions, Leaf Phenology, and Morphology

Sachet

Citadin²,

Scariotto³

et al. 2013

horts

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In breeding programs, it is essential to understand how characteristics are expressed by the germplasm in relation to the selection environment. The reactions of 15 peach genotypes to bacterial leaf spot (BLS) during three growing seasons (2008–09, 2009–10, and 2010–11) were investigated. Quantitative assessments were made from three plants per genotype through a modified healthy leaf area duration (HAD) method. None of the genotypes were immune to the disease. The most resistant were ‘Cascata 1055’, ‘Conserva 985’, ‘Cascata 967’, and ‘Cascata 1065’. There was a reduction in HAD with increased precipitation. The leaf dry matter (g/leaf), leaf blade length, leaf length (with petiole), and leaf area (cm2/leaf) were inversely correlated with genotype resistance to BLS. The HADs of susceptible genotypes were influenced by the number of wet days regardless of temperature. The most susceptible genotypes were those with earlier budburst and fruit ripening. A shorter duration of healthy leaf area was related to earlier budburst and flowering in the subsequent year. We found no relationship between HAD and productivity.

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Escala diagramática para avaliação da severidade de bacteriose em pessegueiro

Cited by 10 publications

References 6 publications

Standard Area Diagram Set for Bacterial Spot Quantification in Entire-Margined Leaves of Sour Passion Fruit

Standard Area Diagram Set for Bacterial Spot Quantification in Entire-Margined Leaves of Sour Passion Fruit

Desenvolvimento e fitossanidade de ameixeiras tratadas com silício em sistema orgânico

Reaction of Peach Genotypes to Bacterial Leaf Spot: Correlations with Environmental Conditions, Leaf Phenology, and Morphology

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