Cornell UniversityCollege of Agriculture and Life Sciences
Department of Horticulture
Department of Plant Pathology
  and Plant-Microbe Biology

Department of Entomology
CCE of Suffolk County
Long Island Horticultural Research and Education Center
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Serving the research and extension needs
of Long Island's horticultural industries.


Vegetable Pathology contact:

Dr. Meg McGrath
mtm3@cornell.edu
3059 Sound Ave.
Riverhead, NY 11901
(631) 727-3595
(631) 727-3611 (fax)

All photographs in this gallery were taken by Meg McGrath unless otherwise noted. For permission to use Meg's, please email her: mtm3@cornell.edu
 

Downy mildew on basil

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These images show first symptoms of downy mildew found on untreated plants in a home garden. First three photographs taken on 9 August 2009, the rest on 12 August 2009.

Yellowing on upper leaf surfaces.
downy mildew on basil

Pathogen growth and spores on lower leaf surfaces.
downy mildew on basil

Close-up of pathogen growth.
downy mildew on basil

Yellowing on upper leaf surfaces.
downy mildew on basil

Pathogen growth and spores on lower leaf surfaces.
downy mildew on basil

Close-up of pathogen growth.
downy mildew on basil

Close-up of pathogen growth.
downy mildew on basil

Close-up of pathogen growth.
downy mildew on basil

Basil downy mildew in a commercial crop. (Photo courtesy Maire Ullrich, Cornell Cooperative Extension-Orange Co., N.Y.)
basil downy mildew in commercial crop

Basil downy mildew in a commercial crop. (Photo courtesy Maire Ullrich, Cornell Cooperative Extension-Orange Co., N.Y.)
basil downy mildew in commercial crop

Basil downy mildew in a commercial crop. (Photo courtesy Maire Ullrich, Cornell Cooperative Extension-Orange Co., N.Y.)
basil downy mildew in commercial crop

Basil downy mildew in a commercial crop. (Photo courtesy Maire Ullrich, Cornell Cooperative Extension-Orange Co., N.Y.)
basil downy mildew in commercial crop

More images of downy mildew on basil at the Cornell Vegetable MD website

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Copyright by the Department of Horticulture Website at Cornell University.