Management of cercospora leaf spot in conventional and organic table beet production
Article
Article Title | Management of cercospora leaf spot in conventional and organic table beet production |
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ERA Journal ID | 2647 |
Article Category | Article |
Authors | Pethybridge, Sarah J. (Author), Vaghefi, Niloofar (Author) and Kikkert, Julie R. (Author) |
Journal Title | Plant Disease: an international journal of applied plant pathology |
Journal Citation | 101 (9), pp. 1642-1651 |
Number of Pages | 10 |
Year | 2017 |
Publisher | American Phytopathological Society |
Place of Publication | United States |
ISSN | 0191-2917 |
1943-7692 | |
Digital Object Identifier (DOI) | https://doi.org/10.1094/PDIS-04-17-0528-RE |
Abstract | Cercospora leaf spot (CLS; Cercospora beticola) is the most important foliar disease affecting table beet. Epidemics occur annually and fungicides extend the survival of foliage to enable mechanized harvest. However, a high frequency of strobilurin-resistant C. beticola isolates necessitates the identification of fungicides with different modes of action for tactical rotation. There is also substantial demand for organically produced table beet, for which synthetic fungicides are prohibited. Five small-plot, replicated field trials were conducted over two years to evaluate conventional and Organic Materials Review Institute (OMRI)-listed products for CLS control in table beet cv. Ruby Queen at Geneva and Ithaca, New York. Benzovindiflupyr + difenoconazole significantly reduced temporal disease progress (measured by the area under the disease progress stairs; AUDPS) by 86.7 to 97.3% compared with nontreated plots, and mean survival time of leaves was significantly extended. The demethylation inhibitor, propiconazole, also provided significant disease control in two trials in 2016. Disease severity in plots treated with succinate dehydrogenase inhibitors (boscalid, fluxapyroxad + pyraclostrobin, and penthiopyrad) was significantly decreased compared with nontreated plots but less than other fungicides. Efficacious fungicides significantly increased the dry weight of foliage but did not significantly affect the dry weight of roots, and root shoulder diameter. The enhanced longevity of leaves and increased dry weight of foliage may extend opportunities for mechanized harvesting without deleteriously affecting root yield parameters which are strictly regulated for the processing markets. In two trials, copper octanoate + Bacillus amyloliquefaciens strain D747 (as Cueva + Double Nickel LC) resulted in significantly improved disease control in comparison with application of either product alone and provided comparable and reproducible disease control equivalent to conventional fungicides at both locations. The implications of these findings for CLS control in conventional and organic table beet production systems are discussed. |
Keywords | cercospora leaf spot; table beet; foliar disease |
ANZSRC Field of Research 2020 | 310805. Plant pathology |
Public Notes | Files associated with this item cannot be displayed due to copyright restrictions. |
Byline Affiliations | Cornell University, United States |
Institution of Origin | University of Southern Queensland |
https://research.usq.edu.au/item/q4619/management-of-cercospora-leaf-spot-in-conventional-and-organic-table-beet-production
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