Onion Smudge: Infected bulb
Pathogen: Colletotrichcum circinans
Symptoms
It occurs on white onion varieties and reduces the market value of the bulbs. The disease is characterized by small dark green to black spots, which appear on the outer scales.
Disease Development
Disease spread is most rapid during moderate temperatures with high humidity, rainfall or overhead irrigation. Infection can be more severe if necks are still succulent when stored. Storing uncured onions at temperatures and humidity which are too high can promote disease development and spread.
Disease Management
Thorough curing of the bulb after harvesting and storing the bulbs in well ventilated rooms can control the disease. The disease can be managed by thorough curing of bulbs after harvesting and storing them in well-ventilated rooms.
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