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ARS Home » Pacific West Area » Salinas, California » Crop Improvement and Protection Research » Research » Publications at this Location » Publication #369136

Research Project: Management of Pathogens for Strawberry and Vegetable Production Systems

Location: Crop Improvement and Protection Research

Title: Early detection, epidemiology, and control of spinach downy mildew

item Klosterman, Steven

Submitted to: Meeting Abstract
Publication Type: Other
Publication Acceptance Date: 10/8/2019
Publication Date: 10/8/2019
Citation: Klosterman, S.J. 2019. Early detection, epidemiology, and control of spinach downy mildew. California Leafy Greens Research Program Mid-Year Meeting, October 8, 2019, Salinas, California.

Interpretive Summary:

Technical Abstract: Downy mildew of spinach and Verticillium wilt of spinach cause foliar symptoms on spinach at different points in its development in the field. Symptoms of downy mildew, caused by the obligate oomycete pathogen, Peronospora effusa, directly impact the marketability of leaves. Symptoms of Verticillium wilt, caused by the fungus Verticillium dahliae do not impact spinach that is grown for fresh market, but the seeds that harbor this pathogen are known to transmit the disease to subsequent crops of lettuce, which are sometimes grown in rotation with spinach in the Salinas Valley of California. This research characterizes a seed treatment that shows promise in reducing the number of propagules of V. dahliae in spinach seeds. This research also explores P. effusa transmission from seed and new pathogen detection technology that allow quicker detection of this pathogen that may be useful in the field. This technology can be applied to determine whether P. effusa is present in spinach leaves before the appearance of symptoms, knowledge of which may be used to treat the plants with fungicides or harvest the crop before symptom appearance.