Microscopic Views of Basil Downy Mildew

Updated June 2020. (Originally prepared for Vegetable MD Online.)

Photographs of the basil downy mildew pathogen, Peronospora belbaharii, at various magnifications.

microscopic view of basil downy mildew
P. belbaharii observed with a dissecting microscope. Images courtesy of Robert L. Wick, Stockbridge School of Agriculture, University of Massachusetts.
microscopic view of basil downy mildew
P. belbaharii observed with a dissecting microscope. Images courtesy of Robert L. Wick, Stockbridge School of Agriculture, University of Massachusetts.
microscopic view of basil downy mildew
P. belbaharii observed with a compound microscope. Images courtesy of Robert L. Wick, Stockbridge School of Agriculture, University of Massachusetts.
microscopic view of basil downy mildew
P. belbaharii observed with a compound microscope. Images courtesy of Robert L. Wick, Stockbridge School of Agriculture, University of Massachusetts.
microscopic view of basil downy mildew
A differential interference image of P. belbaharii. Image courtesy of Robert Belas, Department of Marine Biotechnology, University of Maryland Baltimore County, and Institute of Marine and Environmental Technology.
microscopic view of basil downy mildew
A differential interference image of P. belbaharii. Image courtesy of Robert Belas, Department of Marine Biotechnology, University of Maryland Baltimore County, and Institute of Marine and Environmental Technology.
microscopic view of basil downy mildew
A false-color image of P. belbaharii taken with a 25x objective. Image courtesy of Robert Belas, Department of Marine Biotechnology, University of Maryland Baltimore County, and Institute of Marine and Environmental Technology.