black mold (Aspergillus niger) in Southern Plant Diagnostic Network

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Black mold, caused by <em>Aspergillus niger</em>, on white onion.  Note the sporulating fungus beneath the outer onion skin. See 1571311 for same photo with skin removed. Jun 1995

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

Black mold, caused by Aspergillus niger, on white onion.  Note the sporulating fungus beneath the outer onion skin. See 1571311 for same photo with skin removed. Jun 1995

Black mold, caused by <em>Aspergillus niger</em>, on white onion.  Note the sporulating fungus just beneath the outer onion skin. See 1571308 for same photo with onion skin. Jun 1995

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

Black mold, caused by Aspergillus niger, on white onion.  Note the sporulating fungus just beneath the outer onion skin. See 1571308 for same photo with onion skin. Jun 1995

Onion seed plated on potato dextrose agar shows contamination with <em>Aspergillus niger</em>. October 1996

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

Onion seed plated on potato dextrose agar shows contamination with Aspergillus niger. October 1996

Black mold on an onion.

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

Black mold on an onion.

Black mold (<em>Aspergillus niger</em>) on an onion.

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

Black mold (Aspergillus niger) on an onion.

Onion bulb showing symptoms of black mold (<em>Aspergillus niger</em>).

M.E. Bartolo, Bugwood.org

Onion bulb showing symptoms of black mold (Aspergillus niger).

Onion bulb showing symptoms of black mold (<em>Aspergillus niger</em>).

S. K. Mohan, Bugwood.org

Onion bulb showing symptoms of black mold (Aspergillus niger).

Onion bulb showing symptoms of black mold (<em>Aspergillus niger</em>).

S. K. Mohan, Bugwood.org

Onion bulb showing symptoms of black mold (Aspergillus niger).