Assessing mango anthracnose using a new three‐dimensional image‐analysis technique to quantify lesions on fruit

Corkidi, Gabriel; Balderas-Ruíz, Karina A.; Taboada, Blanca; Serrano‐Carreón, Leobardo; Galindo, Enrique

doi:10.1111/j.1365-3059.2005.01321.x

Cited by 62 publications

(29 citation statements)

References 9 publications

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“…For instance, Corkidi et al (2006) proposed the use of a special digital capture and analysis of rotating diseased (Colletotrichum gloesporioides) mango fruits for the estimate of actual severity. Our SAD is proposed as an aid to provide simple, quick and accurate visual estimate of severity in specific views of the fruit and is not intended to provide overall severity estimation on a 3-D surface.…”

Section: Discussionmentioning

confidence: 99%

Improving sooty blotch and flyspeck severity estimation on apple fruit with the aid of standard area diagrams

Spolti

Schneider

Sanhueza³

et al. 2010

Eur J Plant Pathol

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Sooty blotch and flyspeck is caused by numerous species of fungi that colonize the surface of apple fruit and thereby lower its market value. Although this disease poses a substantial threat to apple growers' profitability in some regions, reliable and cost-effective methods for epidemiological and disease control studies have not been validated, nor are they widely available. We modified a standard area diagram to aid sooty blotch and flyspeck severity assessments and quantified its impact on accuracy and precision of visual estimates. Samples of 'Fuji' and 'Mutsu' fruit were photographed both from the top and laterally. Severity was assessed from a subsample of 160 images using image analysis software. Validation of the diagram was performed by eight raters who independently assessed severity in two series of selected images representing the lateral view and the top view, initially unaided and subsequently with the aid of the scale. Severity estimates ranged from 0.4% to 98% (most fruit had <10% severity). Accuracy and precision of the estimates were significantly improved when using the diagrammatic scale; concordance correlation coefficient values increased from 0.81 to 0.95. A strong tendency to underestimate severity for the mid-range to high levels was minimized when using the aid, which also improved reproducibility of the estimates among raters. In addition to strengthening evidence that a standard area diagram can be used reliably in sooty blotch and flyspeck studies, we expanded its application to disease assessment in the peduncle region, which enhances the usefulness of the method for evaluating efficacy of management practices.

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Section: Discussionmentioning

confidence: 99%

Improving sooty blotch and flyspeck severity estimation on apple fruit with the aid of standard area diagrams

Spolti

Schneider

Sanhueza³

et al. 2010

Eur J Plant Pathol

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“…Although some of the methods used to estimate disease on fruit have been very sophisticated, such as three-dimensional fruit sur face image analysis (14), other methods have relied on two-dimen sional SADs to represent a single face of the approximately spheri cal fruit. Two-dimensional SADs have been developed for fruit diseases (37) and have been validated and demonstrated to improve both accuracy and reliability of rater estimates.…”

mentioning

confidence: 99%

Development and Validation of Standard Area Diagrams as Assessment Aids for Estimating the Severity of Citrus Canker on Unripe Oranges

et al. 2014

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2014. Development and validation of standard area diagrams as assessment aids for estimating the severity of citrus canker on unripe oranges. Plant Dis. 98:1543-1550.Asiatic citrus canker (ACC) is an important disease of citrus in Brazil and elsewhere in the world. Infection with the causal pathogen, Xanthomonas citri subsp. citri, can cause severe disease on the fruit. Visual estimation of severity is the usual method used to quantify ACC on diseased fruit. The objective of this research was to construct and vali date standard area diagram (SAD) sets as assessment aids for raters to improve the accuracy and reliability of visual estimates of ACC on unripe (green) fruit of sweet orange. Two SAD sets were constructed. A five-diagram SAD set had five severities depicted (0.5, 2.0, 8.0, 27.0, and 40.0%) and a six-diagram SAD set had six severities depicted (0.5, 1.0, 3.0, 9.0, 20.0, and 40.0%). Fifteen raters evaluated 40 images of cankered, unripe fruit. Both the five-and six-diagram SAD sets signifi cantly improved the accuracy and reliability of estimates. Agreement, measured by Lin's concordance correlation coefficient, was 0.220 to 0.913 when not using SADs, 0.814 to 0.955 when using five-diagram SAD sets, and 0.863 to 0.925 when using six-diagram SAD sets. The five-diagram SAD set was significantly more accurate and reliable compared with the six-diagram set. Possible reasons for this are dis cussed. Based on the results, the five-diagram SAD set is preferable to use. Although the SAD set was developed for sweet orange, it doubt less has applicability to other citrus, including grapefruit. These SAD sets should be useful for research endeavors where accurate and relia ble estimates of the severity of ACC are required.

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“…A severidade refere-se à proporção de área de tecido colonizado, e sua determinação foi feita com o auxílio de escala diagramática específica para a antracnose em mangas, variando de 0 -1% (sem doença); 1 -5% (doença leve); 6 -9% (doença moderada); 10 -49% (doença severa), e 50-100% de área lesionada/fruto (doença muito severa) (CORKIDI et al, 2006).…”

Section: Methodsunclassified

Controle da antracnose na pós-colheita de manga 'Ubá' com o uso de produtos alternativos

Lemos¹,

Coutinho²,

Salomão³

et al. 2013

Rev. Bras. Frutic.

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Foi avaliada a eficácia de produtos alternativos aos agroquímicos no controle da antracnose na pós-colheita de mangas 'Ubá'. Frutos fisiologicamente maduros foram pulverizados até o completo molhamento, com suspensão de conídios de Colletotrichum gloeosporioides, na concentração de 2,5 x 10(5) conídios/mL. Após a secagem ao ar, foram pulverizados com água destilada (testemunha), tween 20 (8 mL/L de solução), Prochloraz (1,10 mL de Sportak 450 EC/L de solução), óleo de alho (10 mL/L + 8 mL/L de tween 20), óleo de amêndoa de Acrocomia aculeata + leite em pó instantâneo (LPI) (25 mL/L+ 10 g LPI/L), óleo de amêndoa de A. aculeata + tween (25 mL/L + 8 mL/L de tween 20), biofertilizante agro-mos® (100 µL/L), óleo de neen (10 mL/L + 8 mL/L de tween 20), quitosana (10 mL/L + 8 mL/L de tween 20) e biomassa cítrica (10 mL/L + 8 mL/L tween 20).O solvente utilizado foi água destilada. Avaliaram-se o período de incubação, o período latente, a perda de massa fresca, a produção de CO² e, diariamente, a severidade e incidência da doença. Os períodos mais curtos de incubação da doença foram observados nos frutos tratados com óleo de neen, água + tween e biomassa cítrica, com aproximadamente cinco dias. O óleo de amêndoa de A. aculeata + LPI e agro-mos® foram os produtos que mais retardaram o aparecimento dos sintomas, impondo à doença o período de incubação de nove dias após a inoculação do patógeno. Quanto à severidade, o óleo de amêndoa de macaúba + LPI e o Prochloraz foram os mais eficientes em conter o crescimento do patógeno até o oitavo dia após a inoculação, sendo que, logo depois, os frutos tratados com óleo de amêndoa de A. aculeata + LPI se igualaram àqueles tratados com a maioria dos demais produtos. Os frutos tratados com óleo de amêndoa de A. aculeata + LPI e óleo de amêndoa de A. aculeata + tween manifestaram as estruturas do patógeno apenas após 13 e 14 dias de avaliação, respectivamente. As maiores perdas de massa foram observadas nos frutos tratados com óleo de alho e biomassa cítrica, com 8,31% e 8,44%, respectivamente, no dia 14. Quanto à produção de CO², o óleo de amêndoa de A. aculeata + LPI e óleo de amêndoa de A. aculeata + tween mantiveram a taxa respiratória crescente, sendo que, no dia 12 ocorreu um leve aumento na respiração. Dessa forma, conclui-se que, além do Prochloraz, o óleo de amêndoa de A. aculeata + LPI e óleo de amêndoa de A. aculeata + tween têm bom potencial para controle da antracnose em manga 'Ubá'.

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Assessing mango anthracnose using a new three‐dimensional image‐analysis technique to quantify lesions on fruit

Cited by 62 publications

References 9 publications

Improving sooty blotch and flyspeck severity estimation on apple fruit with the aid of standard area diagrams

Improving sooty blotch and flyspeck severity estimation on apple fruit with the aid of standard area diagrams

Development and Validation of Standard Area Diagrams as Assessment Aids for Estimating the Severity of Citrus Canker on Unripe Oranges

Controle da antracnose na pós-colheita de manga 'Ubá' com o uso de produtos alternativos

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