Author(s): Shivali Kharoliwal

Abstract: Onion is one of the most important underground vegetable bulb crops grown commercially in India. It belongs to family Liliaceae and is popularly known as Queen of Kitchen. Onion being a root crop gets infested by various soil-borne diseases during its growth. The incidence of Aspergillus niger (black mould) was found to be high on seed produced in Kota district of Rajasthan. The fungus was transmitted from contaminated seeds to the cotyledons. Aspergillus niger was found the main causal agent of seed-borne fungi of onion (Allium cepa L.) respectively. The pathogens were transmitted from infected seeds to seedlings, sets or bulbs. Based on symptomatology, cultural and morphological characteristics, microscopic observations and pathogenicity test, the test pathogen was identified as Aspergillus niger and its further identity was confirmed. Fungi was isolated on PDA media and was characterized in laboratory.

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