Development and validation of a set of standard area diagrams to estimate severity of potato early blight

Duarte, Henrique da Silva Silveira; Zambolim, Laércio; Capucho, Alexandre Sandri; Júnior, Antonio Fernandes Nogueira; Rosado, André Wilson Campos; Cardoso, Carine Rezende; Paul, Pierce A.; Mizubuti, Eduardo S. G.

doi:10.1007/s10658-013-0234-3

Cited by 55 publications

(38 citation statements)

References 19 publications

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“…After inoculation, dimetomorph was applied as needed to control late blight using a backpack sprayer (conical tip with a pressure of 2.1 × 10 5 Pa at a rate of 600 L/ha). The severity of EB on all leaves of five plants per plot was quantified every seven days, beginning at inoculation, using a standard area diagram as described by Duarte et al (2013). EB progress curves from cultivars exhibiting the same level of resistance were grouped to generate a unique progress curve for resistant, moderately resistant, moderately susceptible and susceptible groups.…”

Section: Inoculation and Assessment Of Eb Severitymentioning

confidence: 99%

Field resistance of potato cultivars to foliar early blight and its relationship with foliage maturity and tuber skin types

Duarte¹,

Zambolim²,

Rodrigues³

et al. 2014

Trop. plant pathol.

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Three field experiments were carried out to assess the level of resistance of several cultivars to early blight (EB) and to examine the association between host resistance and either foliage maturity or tuber skin types. A total of 26 cultivars were used in Exps. 1 and 2, and 24 in Exp. 3. Plants were inoculated with isolates of Alternaria grandis at 31 days after planting. EB severity was quantified in each plot every seven days. The approach to determine the resistance levels of potato cultivars was based on multivariate analysis techniques. The tested cultivars responded as either resistant, moderately resistant, moderately susceptible or susceptible to EB. Most of the cultivars were classified as susceptible or moderately susceptible to EB. Resistant cultivars were mid-season, mid-late or late maturity. None of the susceptible cultivars were later maturity (mid-late or late maturity). In most cases, susceptible cultivars were earlier maturity (early or mid-early maturity). Most resistant cultivars had rough, mid-rough or smooth skin. None of the susceptible cultivars had rough skin. In most cases, susceptible or moderately susceptible cultivars had smooth skin. Obtaining potato cultivars that are resistant to this destructive disease will help reduce production costs and the need for costly fungicides.

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Section: Inoculation and Assessment Of Eb Severitymentioning

confidence: 99%

Field resistance of potato cultivars to foliar early blight and its relationship with foliage maturity and tuber skin types

Duarte¹,

Zambolim²,

Rodrigues³

et al. 2014

Trop. plant pathol.

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“…In general, evaluation for resistance to early blight is carried out in the field and in greenhouse, where plants are subjected to both natural infection and artificial inoculation by conidia (NACHMIAS et al, 1988;DUARTE et al, 2013 and2014). However, the latter is limited by the difficulty in producing sufficient spores of Alternaria spp.…”

Section: Resultsmentioning

confidence: 99%

Characterization of Alternaria isolates and reaction of potato genotypes to early blight

et al. 2016

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“…In most studies involving the validation of SAD sets to determine disease severity on leaves, raters have shown a tendency to overestimate the severity (Newton & Hackett, ; Parker et al ., ; Diaz et al ., ; Capucho et al ., ; Lenz et al ., ; Rios et al ., ), although in a few studies, the severity was underestimated (Michereff et al ., ; Gomes et al ., ; Duarte et al ., ). In the present study, an overestimate of spot blotch severity on wheat using the SAD set was also observed.…”

Section: Discussionmentioning

confidence: 97%

“…Therefore, the risk of erroneous decisions or type II errors in subsequent statistical analysis will be minimized (Nutter et al ., ; Bock et al ., ). SAD sets have been demonstrated to improve the accuracy and reliability of estimates of several diseases affecting crops of economic importance, such as Asian soybean rust on soybeans (Godoy et al ., ), coffee leaf rust on coffee (Capucho et al ., ), white spot on corn (Capucho et al ., ), ramularia on cotton (Aquino et al ., ), early blight on potato (Duarte et al ., ), blast on wheat (Rios et al ., ) and brown spot on rice (Lenz et al ., ). The SAD set developed and validated in the present study should be a useful tool for estimating spot blotch severity on wheat, with accuracy, precision and reliability.…”

Section: Discussionmentioning

confidence: 99%

“…Standard area diagram sets are illustrations of diseased plants, leaves, or other plant parts, with distinct severity values that are used as references with which to compare samples when estimating disease severity (Duarte et al ., ). Desirable characteristics of SAD sets include ease of use, reproducibility of results, wide applicability and the presence of intervals that represent all stages of disease symptoms (Berger, ).…”

Section: Introductionmentioning

confidence: 97%

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Development and validation of a set of standard area diagrams to aid in estimation of spot blotch severity on wheat leaves

et al. 2013

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This study aimed to develop and validate a standard area diagram (SAD) set to quantify the severity of spot blotch, caused by Bipolaris sorokiniana, on wheat leaves. The proposed SAD set includes images of leaves with 11 distinct disease severities (0Á1, 1, 5, 10, 20, 30, 40, 50, 60, 70 and 83%). The SAD set was validated by 12 raters without experience in evaluating plant disease. Lin's concordance correlation analysis of estimated versus actual disease severity (based on image analysis) showed that precision and accuracy improved for all raters using the SAD set in contrast to assessments made without it. The SAD set improved accuracy (coefficient of bias, C b = 0Á88 and 0Á99, without and with the SAD set, respectively) and agreement (Lin's concordance correlation coefficient, q c = 0Á81 and 0Á96 without and with the SAD set, respectively) of the estimates of severity. The severity estimates were also more reliable when using the SAD set (coefficient of determination, R 2 = 0Á76 unaided and R 2 = 0Á92 with the SAD set, and intra-class correlation q = 0Á79 without the SAD set and q = 0Á95 using the SAD set). The SAD set proposed in this study will improve the accuracy and reliability of estimates of spot blotch severity on wheat leaves.

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Development and validation of a set of standard area diagrams to estimate severity of potato early blight

Cited by 55 publications

References 19 publications

Field resistance of potato cultivars to foliar early blight and its relationship with foliage maturity and tuber skin types

Field resistance of potato cultivars to foliar early blight and its relationship with foliage maturity and tuber skin types

Characterization of Alternaria isolates and reaction of potato genotypes to early blight

Development and validation of a set of standard area diagrams to aid in estimation of spot blotch severity on wheat leaves

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