Comparative evaluation of lateral flow immunoassays, LAMP, and quantitative PCR for diagnosis of fire blight in apple orchards

Fire blight remains a serious threat to commercial apple production in the USA and worldwide. Other diseases and spray damage can result in fire blight-like symptoms that can lead to misdiagnosis and affect disease management strategies. Accurate and timely detection of the fire blight pathogen, Erw...

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Bibliographic Details
Published in:Journal of plant pathology 2021-08, Vol.103 (Suppl 1), p.S131-S142
Main Authors: Singh, Jugpreet, Cobb-Smith, Della, Higgins, Elizabeth, Khan, Awais
Format: Article
Language:English
Subjects:
Biomedical and Life Sciences
Life Sciences
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ORIGINAL ARTICLE
Plant Sciences
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Summary:Fire blight remains a serious threat to commercial apple production in the USA and worldwide. Other diseases and spray damage can result in fire blight-like symptoms that can lead to misdiagnosis and affect disease management strategies. Accurate and timely detection of the fire blight pathogen, Erwinia amylovora, is extremely important to deploy appropriate and timely measures to reduce fire blight epidemics in commercial apple orchards. We tested two commercial lateral flow immunoassays (AgriStrip®, and Pocket Diagnostics kit), Loop mediated isothermal amplification (LAMP), and quantitative PCR (qPCR) to diagnose E. amylovora infected samples in lab and field settings. The AgriStrip® and Pocket Diagnostics kits were able to detect actively growing bacteria up to × 10⁶ cfu/ml bacterial concentration. Pocket Diagnostics kit had less specificity and showed positive tests for E. pyrifolia in addition to E. amylovora. The LAMP assay showed high specificity for E. amylovora and was able to detect up to × 10³ cfu/ml bacterial concentrations. The qPCR assay was also able to detect bacterial cells up to × 10⁻³ cfu/ml bacterial concentration with highly specific E. amylovora detection. Grower surveys and comparative cost-benefit analysis indicated that immunoassay kits are less expensive, easier to use, and require less technical expertise for on-site fire blight diagnosis than LAMP and qPCR. However, the choice of a specific diagnostic assay depends on the time, sensitivity, and specificity required for the detection of fire blight and its management.
ISSN:1125-4653
2239-7264
DOI:10.1007/s42161-020-00644-w