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The Scientific World Journal
Volume 2014, Article ID 947167, 5 pages
Research Article

Foliar Treatments of 2,4-Dichlorophenoxyacetic Acid for Control of Common Scab in Potato Have Beneficial Effects on Powdery Scab Control

Tasmanian Institute of Agriculture, New Town Research Laboratories, University of Tasmania, 13 St. Johns’ Avenue, TAS 7008, Australia

Received 11 March 2014; Accepted 20 May 2014; Published 29 May 2014

Academic Editor: Jean-Francois Hausman

Copyright © 2014 Hannah Katherine Thompson et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.


Prior studies have shown that applications of the synthetic auxin 2,4-dichlorophenoxyacetic acid (2,4-D) to the foliage of potato plants can reduce common scab. Here field and glasshouse trials suggest that 2,4-D foliar treatments may also reduce the biologically distinct tuber disease, powdery scab. Significant correlations between suppression of common and powdery scab from the field trials suggested an interaction between the two diseases or possible additional broad spectrum mechanisms of enhanced defence against pathogen invasion provided by 2,4-D treatment.