Additional fungicides for the management of Cercospora beticola of sugar beet (Beta vulgaris L.)- efficacy and integration

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University of Guelph

Abstract

Field trials were conducted in 2020 and 2021 to investigate the efficacy of a phosphite based fungicide and integration of this fungicide into spray programs for the management of Cercospora leaf spot (CLS) (Cercospora beticola Sacc.) of sugar beet (Beta vulgaris L.). Results showed that phosphites were not effective for the management of CLS. The addition of the phosphites based fungicide did not decrease the area under the disease progress stairs or disease severity on the final rating date. Applying fungicides using calendar- based timing resulted in fewer fungicide applications per year in comparison to BEETcastTM timing of applications. Phosphite applied to agar plates at concentrations 0.01-100 uL/mL did not inhibit mycelium growth of C. beticola. The number of necrotic lesions was not reduced during detached leaf assays treated with 0.019 uL/mL phosphite and C. beticola added 72 hrs after fungicide exposure.

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Keywords

Sugarbeet, Sugar beet, Cercospora

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