Black mould

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Black mould
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Micrograph of A. niger
Scientific Classification
Kingdom: Fungi
Phylum: Ascomycota
Class: Eurotiomycetes
Order: Eurotiales
Family: Trichocomaceae
Genus: Aspergillus
Species: Aspergillus niger

Black mold
Black mould

Aspergillus niger var. niger
Aspergillopsis nigra (Tiegh.) Speg.
Rhopalocystis nigra (Tiegh.) Grove

Sterigmatocystis nigra (Tiegh.) Sacc., (1877)

Black mould (Aspergillus niger) causes rotting in stored onions. It mainly occurs in warmer areas. A. niger survives in the soil and on plant debris. Infection takes place on the necks of onions during the ripening and senescence of the plants.[1]

Symptoms[edit | edit source]

Clusters of black spores form on and between the outer papery scales.[1]

Prevention[edit | edit source]

Because A. niger is transmitted by seeds and sets, a pre-planting treatment may help to reduce infection levels. Irrigation should be stopped not less than 3 weeks before harvest. Damage should be avoided during lifting and loading into stores. High temperatures above 30°C (86°F) for more than 10 days should be avoided. No fungicide is currently used against this disease.[1]


Examples[edit | edit source]

References[edit | edit source]


  1. a b c (1994). Guidelines on Good Plant Protection Practice - Allium Crops. European and Mediterranean Plant Protection Organization. 1, rue Le Nôtre, 75016 Paris, France. p8.