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Determination of optimal timing of 2,4-dichlorophenoxyacetic acid foliar applications for common scab control in potato


Thompson, HK and Tegg, RS and Davies, NW and Ross, JJ and Wilson, CR, Determination of optimal timing of 2,4-dichlorophenoxyacetic acid foliar applications for common scab control in potato, Annals of Applied Biology, 163, (2) pp. 242-256. ISSN 0003-4746 (2013) [Refereed Article]

Copyright Statement

Copyright 2013 Association of Applied Biologists

DOI: doi:10.1111/aab.12050


Application of 2,4-dichlorophenoxyacetic acid (2,4-D) has been shown to be an effective control method for common scab of potato. Prior research targeted applications at or shortly after tuber initiation during the period of known susceptibility, with later treatment providing little or no control. This study examined the effect of a range of application dates and the influence of multiple applications at low and high rates on common scab control in both Russet Burbank and Desiree cultivars. We show that applications as early as 5 days after average plant emergence gave the greater disease control for both cultivars. These early treatments provide sufficient material to the tuber to induce resistance that lasts throughout the tuber susceptibility period with no requirement for, or benefit of repeated applications. Agronomic assessments suggested minor effects on total tuber mass produced with 2,4-D treatment but these were not consistent. Effective treatments result in levels of 2,4-D at harvest below the Australian maximum residue limit.

Item Details

Item Type:Refereed Article
Keywords:2,4-D, auxin, non-fungicidal foliar sprays, Solanum tuberosum, Streptomyces scabies
Research Division:Agricultural, Veterinary and Food Sciences
Research Group:Crop and pasture production
Research Field:Crop and pasture 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:Thompson, HK (Dr Hannah Thompson)
UTAS Author:Tegg, RS (Dr Robert Tegg)
UTAS Author:Davies, NW (Associate Professor Noel Davies)
UTAS Author:Ross, JJ (Associate Professor John Ross)
UTAS Author:Wilson, CR (Professor Calum Wilson)
ID Code:86280
Year Published:2013
Web of Science® Times Cited:5
Deposited By:Tasmanian Institute of Agriculture
Deposited On:2013-09-03
Last Modified:2014-04-08

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