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Low-dose foliar treatments of the auxin analog 2,4-D reduce potato common scab and powdery scab for multiple potato cultivars and enhance root development

Clarke, CR, Tegg, RS ORCID: 0000-0001-7668-7927, Thompson, HK, Frederick, C, Haynes, KG, Kramer, M and Wilson, CR ORCID: 0000-0001-5434-3816 2020 , 'Low-dose foliar treatments of the auxin analog 2,4-D reduce potato common scab and powdery scab for multiple potato cultivars and enhance root development' , Crop Protection, vol. 136 , pp. 1-12 , doi: 10.1016/j.cropro.2020.105208.

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Common scab and powdery scab are major soilborne diseases of potato (Solanum tuberosum). The agricultural cost of both diseases is due to discounting or rejection of infected seed tubers or the formation of lesions on the surface of the tubers that make them unmarketable or, for powdery scab, yield loss. There are no widely accessible and efficacious disease management options for either common scab or powdery scab. In prior work, low-dose foliar treatment with the auxin analog herbicide 2,4-D has been shown to reduce common scab severity of select S. tuberosum cultivars in field and greenhouse settings. In the present study, we address the broad applicability of 2,4-D in disease management by testing the efficacy of 2,4-D treatment across diverse potato cultivars and in suppressing multiple scab diseases of potato. Specifically, we tested whether low-dose 2,4-D treatment is broadly efficacious on multiple white potato cultivars used in Eastern United States potato production. Additionally, we sought to determine whether 2,4-D is efficacious for mitigating powdery scab for Russet Burbank potatoes in a commercial field setting. In two years of field trials, low-dose foliar 2,4-D treatment significantly reduced common scab of all tested potato cultivars with no impact on total tuber yield. In two years of field trials in Tasmania, Australia, low-dose foliar 2,4-D treatment also reduced powdery scab of Russet Burbank potato with no impact on total tuber yield while stimulating potato plant root growth. The ability of 2,4-D to suppress two major tuber diseases and stimulate potato root growth warrants further investigation and optimization for integration into commercial growing systems.

Item Type: Article
Authors/Creators:Clarke, CR and Tegg, RS and Thompson, HK and Frederick, C and Haynes, KG and Kramer, M and Wilson, CR
Keywords: Streptomyces scabiei, Spongospora subterranea, 2,4-D, disease management, root development, tuber yield, auxin, thaxtomin, common scab, potato roots
Journal or Publication Title: Crop Protection
Publisher: Elsevier Sci Ltd
ISSN: 0261-2194
DOI / ID Number: 10.1016/j.cropro.2020.105208
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Copyright © 2020 Elsevier B.V. or its licensors or contributors

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