Our mission: regional participation in a national, integrated system providing useful, reliable information and tools for IPM practioners

About Ag Pest Monitor: Basil

Who We Are

Basil downy mildew was first observed in the USA in fall 2007 in Florida.  Seed contaminated with the pathogen was likely the initial source of the pathogen.  Wind-dispersed spores are considered a more important source of the pathogen for field-grown plantings and gardens.  There have been occurrences in greenhouses in winter for which contaminated seed seemed the likely pathogen source.

The causal pathogen is Peronospora belbahrii.

Sweet basil is more susceptible than spice types.

Other types of plants are not susceptible.

The pathogen cannot survive in soil overwinter.

Our History

Occurrence reports are very important for alerting others growing basil of where and when downy mildew is developing this year and in the past.  Before this web page was created reports were logged in GoogleDocs spreadsheets.   This information, plus details about occurrences from reporters, has added substantially to knowledge about basil downy mildew.  Historial records at this site are incomplete.  Click here to go to another website with  information about past occurrences.