Field efficacy of Tagetes erecta extract against onion downy mildew (Peronospora destructor)

Document Type : Research article

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Plant Pathology Research Institute, Agricultural Research Center, Giza, Egypt

Abstract

Field experiments were conducted at Etay El-Baroud Agricultural Research Station, Beheira Governorate, Egypt, during the 2020–21 and 2021–22 growing seasons to evaluate the efficacy of Tagetes erecta extract as a foliar treatment against onion downy mildew (Peronospora destructor). The trials involved two onion cultivars (Italy red and Giza 20) and tested T. erecta extract at concentrations of 1, 2, 3, and 4 ml/L, compared with the fungicide Acrobat MZ 69% WG at 2.5 g/L. Results demonstrated that disease severity was significantly reduced in all treatment groups compared to the control, with T. erecta at 4 ml/L performing comparably to Acrobat MZ. Additionally, treated plants showed increased leaf number, plant height, bulb yield, and higher levels of chlorophyll a, chlorophyll b, and nitrogen content. Disease severity and treatment efficacy were influenced by cultivar and growing season. The findings suggest that T. erecta extract is a promising eco-friendly alternative to chemical fungicides in onion disease management.

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Archives of Agriculture Sciences Journal
Volume 8, Issue 1
April 2025
Pages 110-121

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