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Grading seed potato lots to remove tubers with powdery scab damage may not eliminate the pathogen threat


Tegg, RS and Thangavel, T and Balendres, MA and Wilson, CR, Grading seed potato lots to remove tubers with powdery scab damage may not eliminate the pathogen threat, American Journal of Potato Research, 93, (3) pp. 231-238. ISSN 1099-209X (2016) [Refereed Article]

Copyright Statement

Copyright The Potato Association of America 2016

DOI: doi:10.1007/s12230-016-9499-3


Grading seed tubers is a common practice to remove visually diseased tubers and meet certification standards. This study sought to quantify Spongospora subterranea inocula, the causal agent of powdery scab in eight commercial seedlots prior to and following grading. Pathogen levels generally decreased although the extent of reduction was dependant on the mean disease level within each seedlot, prior to grading. Where mean seedlot disease incidence was high (20 to 40%) grading was not effective, reducing pathogen levels by only 2-fold (P > 0.05) on the visually disease-free seed following grading which remained a high risk for disease in progeny plants. However, where mean seedlot disease incidence was low (5 to 7%) grading substantially reduced S. subterranea inoculum (1223-fold, P < 0.05) on the visually disease-free seed to low risk levels. In further pot and field trials, planting visually disease-free tubers graded from contaminated lines gave variable disease levels in progeny plants, although under conducive conditions resulted in root and tuber disease no different to planting diseased seed.

Item Details

Item Type:Refereed Article
Keywords:powder scab, Spongospora subterranea, root galling, disease risk, certification, qPCR
Research Division:Agricultural, Veterinary and Food Sciences
Research Group:Horticultural production
Research Field:Horticultural crop protection (incl. pests, diseases and weeds)
Objective Division:Plant Production and Plant Primary Products
Objective Group:Horticultural crops
Objective Field:Field grown vegetable crops
UTAS Author:Tegg, RS (Dr Robert Tegg)
UTAS Author:Thangavel, T (Dr Tamil Thangavel)
UTAS Author:Balendres, MA (Mr Mark Balendres)
UTAS Author:Wilson, CR (Professor Calum Wilson)
ID Code:106470
Year Published:2016
Web of Science® Times Cited:3
Deposited By:Tasmanian Institute of Agriculture
Deposited On:2016-02-11
Last Modified:2017-11-06

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