Evaluation of Spinach Cultivars for Downy Mildew Resistance in San Juan Bautista, CA, 2023

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Field evaluation shows disease incidence of downy mildew in various spinach cultivars, indicating significant variability.

Disease incidence of downy mildew varied from 0.0 to 100.0% among 70 spinach cultivars tested.
The evaluation used naturally occurring inoculum to assess cultivar resistance to the downy mildew pathogen.
The assessment took place in San Juan Bautista, CA, and recorded disease data 46 days after wet-date.
Results suggest the need for breeding programs focused on enhancing downy mildew resistance in spinach.

Zima et al. (2025) studied this question.

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