![]() ![]() Purplish-gray, fuzzy growth of the pathogen, which is usually on the underside of leaves, is diagnostic. The causal agent of spinach downy mildew is Peronospora effusa (previously known as P. Disease knowledge is the foundation of a management program. If downy mildew is suspected, please contact your local extension specialist and send an e-mail to Knowledge about occurrences is critical for a regional approach to management based on all having a general awareness of occurrence in the region (as done with late blight). Downy mildew can seemingly explode overnight when conditions become favorable again. There can be a long delay between infection and symptom appearance when conditions are unfavorable following infection. There have been cases of symptoms being first observed during spring in high tunnels due either to conditions not being favorable until then for symptoms to develop or recent infection by wind-dispersed spores. Inspect at least once a week or when row covers are removed with winter crops. They are similarly able to produce an abundance of wind-dispersed spores capable of moving long distances, do not need leaves to be wet to infect (high humidity is sufficient), and can devastate crops.Īll growers with spinach should examine their plants routinely for symptoms of downy mildew. Pathogens causing downy mildew are Oomycetes and thus related to the late blight pathogen. This disease has been a major production constraint in California and Arizona. Prior to this there were no reports for about 15 years. Results from Grower Survey about Diseases Occurring in Winter Greens including Spinachĭowny mildew has been found in spinach on several farms in the northeastern U.S.Diseases Occurring in Winter Greens and their Management.PDMR: Biofungicides and conventional fungicides for spinach downy mildew in Arizona 2015 | 2017.PDMR: Varieties for resistance to spinach downy mildew in Arizona.(Click on ‘Search All Reports’ on left side of page and enter ‘spinach and downy’) Published Plant Disease Management Reports (PDMR) reports on evaluations of resistant varieties and biofungicides.(Feature article published in Plant Disease in 2019). Spinach Downy Mildew: Advances in Our Understanding of the Disease Cycle and Prospects for Disease Management.This factsheet contains information on the following: ![]()
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