Howard F. Schwartz, Colorado State University, Bugwood.org

An onion bulb with symptoms of the Botrytis soil line rot caused by Botrytis sp.  in the field.

Gerald Holmes, Strawberry Center, Cal Poly San Luis Obispo, Bugwood.org

Soil-line decay of onion.  Note the gray sporulation of Botrytis allii. February 1996

S. K. Mohan, Bugwood.org

scape blight of onion plants resulting in collapse of some onion scapes

S. K. Mohan, Bugwood.org

Scape blight of onion

Howard F. Schwartz, Colorado State University, Bugwood.org

Field onion plants showing blast symptoms caused by Botrytis allii.

Howard F. Schwartz, Colorado State University, Bugwood.org

Dried onion culls with Botrytis, Botrytis allii on the filed .

Howard F. Schwartz, Colorado State University, Bugwood.org

Onion plants with symptoms of the Botrytis soil line rot caused by Botrytis sp.  in the field.

Howard F. Schwartz, Colorado State University, Bugwood.org

A greenhouse inoculation of sliced onion bulbs with the Botrytis rot pathogen, Botrytis allii.