Rhizopus Stem Rot of Nicotiana glauca. K. I. Wilson, Plant Pathologist, Plant Protection Research Station, Abu Ghraib, Baghdad, Iraq. A. S. Al-Beldawi, Director, and Karim Dwazah, Research Associate, Plant Protection Research Station, Abu Ghraib, Baghdad, Iraq. Plant Dis. 67:526-527. Accepted for publication 27 September 1982. Copyright 1983 American Phytopathological Society. DOI: 10.1094/PD-67-526.

Rhizopus arrhizus incited stem rot of Nicotiana glauca plants in the field, resulting in a slimy wet rot of the cortical tissues that became pale to yellowish brown when dry. The disease often caused the flower heads to bend downward. The fungus also infected several detached fruits and vegetables including cotton (Gossypium hirsutum) bolls and sunflower (Helianthus annuus) heads when artificially inoculated. Maximum radial growth of the fungus on potato-dextrose agar and maximum decay in cucumber (Cucumis sativus) fruits occurred at 35 C.