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Causal Agent
Enterobacter cloacae
Distribution
Poland and USA (California, Colorado, New York, Utah and Washington)
Symptoms
The exterior of the bulb remains asymptomatic while the inner scales show a brown to black discoloration and decay.
Bulb longitudinal-section showing infected internal scales.
Conditions for Development
This disease was observed in mature bulbs in the field after a period where air temperatures had reached 40-45°C (104-113°F). The bacterium is common in many environments and is considered to be an opportunistic pathogen on onions.
Control
No control measures have been reported.